Accounting
Anthropology
Archaeology
Art History
Banking
Biology & Life Science
Business
Business Communication
Business Development
Business Ethics
Business Law
Chemistry
Communication
Computer Science
Counseling
Criminal Law
Curriculum & Instruction
Design
Earth Science
Economic
Education
Engineering
Finance
History & Theory
Humanities
Human Resource
International Business
Investments & Securities
Journalism
Law
Management
Marketing
Medicine
Medicine & Health Science
Nursing
Philosophy
Physic
Psychology
Real Estate
Science
Social Science
Sociology
Special Education
Speech
Visual Arts
Physic
Q:
Which has greater kinetic energy: a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?
A) The 30-km/h car
B) The 60-km/h car
C) both have the same kinetic energy
Q:
The massive ram of a pile driver falling from rest strikes a pile with a speed that depends on the
A) initial height of the ram.
B) initial potential energy of the ram.
C) distance the ram falls.
D) all of the above
Q:
A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance. When it returns to its initial level its kinetic energy is
A) less than 100 J.
B) more than 100 J.
C) 100 J.
D) need more information
Q:
A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of
A) less than 100 J.
B) more than 100 J.
C) 100 J.
D) need more information
Q:
Work is done by gravity on a bowling ball that rolls
A) along a horizontal surface.
B) on a sloped surface.
C) both of these
D) none of the above
Q:
If a charging rhinoceros has momentum, it must also have
A) potential energy.
B) kinetic energy.
C) work.
D) all of the above
Q:
An object that has kinetic energy must be
A) moving.
B) falling.
C) at an elevated position.
D) at rest.
E) none of the above
Q:
A bow is drawn so that it has 40 J of potential energy. When the arrow is fired its kinetic energy is ideally
A) less than 40 J.
B) more than 40 J.
C) 40 J.
Q:
A moving object has
A) speed.
B) velocity.
C) momentum.
D) energy.
E) all of the above
Q:
A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height?
A) 1 m
B) 2 m
C) 3 m
D) 4 m
E) none of the above
Q:
A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is
A) 8 J.
B) 20 J.
C) 60 J.
D) 80 J.
E) none of the above
Q:
A clerk can lift containers a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is
A) half as much.
B) twice as much.
C) the same.
Q:
It takes 40 J to push a large crate 4 m across a floor. The force exerted on the crate is
A) 4 N.
B) 10 N.
C) 40 N.
D) 160 N.
E) 1600 N.
Q:
A music console is pushed 2 m by a force of 20 N. The work done on the console is
A) 2 J.
B) 10 J.
C) 20 J.
D) 40 J.
E) 80 J.
Q:
An object lifted 10 m gains a certain amount of potential energy. If it is lifted 20 m, its gain in potential energy is
A) less.
B) the same.
C) twice as much.
D) four times as much.
E) more than four times as much.
Q:
A 1000-kg car and a 2000-kg car are hoisted the same vertical distance in a service station. Raising the more massive car requires
A) less work.
B) as much work.
C) twice as much work.
D) four times as much work.
E) more than four times as much work.
Q:
The amount of potential energy possessed by an elevated object is
A) relative to a chosen reference level.
B) equal to the work done in lifting it.
C) equal to the kinetic energy it will acquire when freely falling to its reference level.
D) all of the above
Q:
An object may have potential energy because of its
A) speed.
B) acceleration.
C) momentum.
D) location.
E) none of the above
Q:
When you push an object a certain distance while applying twice the force, you do
A) twice as much work.
B) four times as much work.
C) the same amount of work.
Q:
If you push an object twice as far while applying the same force, you do
A) twice as much work.
B) four times as much work.
C) the same amount of work.
Q:
If you push for an hour against a stationary wall, you do no work
A) on the wall.
B) at all.
C) both of these
D) none of the above
Q:
The unit kilowatt-hour is a unit of
A) energy.
B) momentum.
C) power.
D) time.
Q:
Whereas impulse involves the time that a force acts, work involves the
A) distance that a force acts.
B) time and distance that a force acts.
C) acceleration that a force produces.
Q:
An open freight car rolls friction-free along a horizontal track in vertically pouring rain. As water accumulates in the car, its speed
A) increases.
B) decreases.
C) doesn't change.
Q:
When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, he doesn't slip off the skateboard because of
A) inertia in motion.
B) momentum change.
C) friction between his feet and the board.
Q:
When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard
A) decreases.
B) increases.
C) neither decreases nor increases.
Q:
Two identical gliders slide toward each other on an air track. One glider moves at 1 m/s and the other glider moves at 2 m/s. They collide, stick, and move at
A) 1/2 m/s.
B) 1/3 m/s.
C) 1/6 m/s.
D) 3/4 m/s.
E) 1.5 m/s.
Q:
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. When they collide and stick, the combined-glider speed is
A) 0 m/s.
B) 1/2 m/s.
C) 1/3 m/s.
D) 1/6 m/s.
E) 1.5 m/s.
Q:
Consider gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with glider B, which has a mass of 5 kg and is at rest. If they stick upon collision the combined-glider speed will be
A) 1/4 m/s.
B) 1/5 m/s.
C) 1/6 m/s.
D) 1 m/s.
E) none of the above
Q:
A 1-N-falling apple hits the ground with a force of
A) 1 N.
B) 2 N.
C) 4 N.
D) 10 N.
E) not enough information
Q:
When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is
A) negligible compared to the momentum of the apple.
B) greater if the apple bounces.
C) greater than that of the apple whether or not bouncing occurs.
D) none of the above
Q:
When a 100-kg astronaut ejects 0.1 kg of gas at a speed of 50 m/s from her propulsion pistol, her recoil speed is
A) 50 m/s.
B) 5.0 m/s.
C) 0.5 m/s.
D) 0.05 m/s.
Q:
A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades at 1 m/s. The girl's speed is
A) 0.45 m/s.
B) 0.55 m/s.
C) 0.83 m/s.
D) 1.2 m/s.
Q:
Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be
A) zero.
B) the same as before.
C) small, but noticeable.
Q:
A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball initially at rest. After the putty sticks to the ball, both move with a combined momentum of
A) less than 1 unit.
B) more than 1 unit.
C) 1 unit.
D) not enough information
Q:
A 1-kg chunk of putty moving at 1 m/s collides and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty move with a momentum of
A) 0 kgm/s.
B) 1 kgm/s.
C) 2 kgm/s.
D) 5 kgm/s.
E) more than 5 kgm/s.
Q:
A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s.
B) 1.5 m/s.
C) 2.5 m/s.
D) none of the above
Q:
A 1-kg chunk of putty moving at 1 m/s collides and sticks to a 5-kg bowling ball that is initially at rest in space. The bowling ball and putty are then set in motion with a speed of
A) 1/4 m/s.
B) 1/5 m/s.
C) 1/6 m/s.
D) none of the above
E) not enough information
Q:
The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.
Q:
Just after a big fish swallows a small fish, the momentum of the two-fish system is
A) greater after lunch than before.
B) the same before and after lunch.
C) somewhat less after lunch.
Q:
A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is
A) 1/2 m/s.
B) 1/5 m/s.
C) 1/6 m/s.
D) 2/3 m/s.
E) 3/2 m/s.
Q:
A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is
A) 1/2 m/s.
B) 2/5 m/s.
C) 5/6 m/s.
D) 6/5 m/s.
E) 1 m/s.
Q:
A 2-kg rifle is horizontally suspended by a pair of strings so that recoil can be measured. The rifle fires a 0.001-kg bullet at a speed of 200 m/s. The recoil velocity of the rifle is about
A) 0.001 m/s.
B) 0.01 m/s.
C) 0.1 m/s.
D) 1 m/s.
E) none of the above
Q:
A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater
A) force.
B) impulse.
C) both of these
D) none of the above
Q:
If a monkey floating in outer space throws his hat away, the hat and the monkey will both move
A) away from each other, but at different speeds.
B) away from each other at the same speed.
C) a short distance and then slow down.
D) a short distance and then gain speed.
E) quickly to a stop.
Q:
An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at
A) 20 m/s.
B) a lower speed.
C) a higher speed.
D) more information needed
E) none of the above
Q:
A straw is used for a pea shooter. When you blow through the straw the speed of the emerging pea will be greater if the straw is
A) cut in half.
B) full length.
C) either cut in half or full length.
Q:
Two billiard balls having the same mass roll toward each other at the same speed. What is the net momentum of the two-ball system?
A) 0 kgm/s
B) 10 kgm/s
C) not enough information
Q:
While driving down the highway a lovebug spatters onto your windshield. Which experiences the greater force of impact?
A) the lovebug
B) your car
C) both the same but with different consequences
Q:
While driving down the highway a lovebug spatters onto your windshield. Which undergoes the greater change in momentum during the time of contact?
A) the lovebug
B) your car
C) both the same
Q:
While driving down the highway a lovebug spatters onto your windshield. Which undergoes the greater impulse?
A) the lovebug
B) your car
C) both the same
Q:
A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12 m/s collides with it and they both stick together and move at a speed of
A) 3 m/s.
B) 4 m/s.
C) 6 m/s.
D) 8 m/s.
E) none of the above
Q:
Two identical freight cars roll without friction towards each other on a level track. One car rolls at 2 m/s and the other car rolls at 1 m/s. After the cars collide, they couple and roll together with a speed of
A) 0.5 m/s.
B) 0.33 m/s.
C) 0.67 m/s.
D) 1.0 m/s.
E) none of the above
Q:
A 5000-kg freight car crashes into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg freight car?
A) 4 m/s
B) 5 m/s
C) 6 m/s
D) 8 m/s
E) none of the above
Q:
When bullets are fired in a forward direction from a fighter aircraft, the momentum of the aircraft
A) decreases.
B) is unchanged.
C) increases.
Q:
The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun
A) when momentum is conserved.
B) because velocity is conserved.
C) when both velocity and momentum are conserved.
D) if the masses of the bullet and gun are equal.
E) none of the above
Q:
Consider a gun with a pellet that is more massive than the gun. The firing speed is greater for the
A) pellet.
B) recoiling gun.
C) both are the same
D) none of the above
Q:
When a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to differences in
A) forces.
B) times.
C) masses.
D) momenta.
Q:
The force that accelerates a rocket in outer space is exerted on the rocket by the
A) rocket's engine.
B) rocket's wings.
C) atmospheric pressure.
D) exhaust gases.
E) none of the above
Q:
Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar. If he runs in the opposite direction, the combined momentum of Jake and the flatcar relative to an observer at rest will be
A) more.
B) the same.
C) less.
Q:
When Jean standing on slippery ice catches her leaping dog Daisy, the momentum of both Jean and Daisy after the catch is
A) greater than their combined momentum before the catch.
B) equal to their combined momentum before the catch.
C) somewhat less than their combined momentum before the catch.
Q:
A heavy truck and a small car roll down a hill at the same speed and need to stop in the same amount of time. Compared with the force to stop the car, the force needed to stop the truck is
A) greater.
B) smaller.
C) the same.
Q:
The conservation of momentum is most closely related to Newton's
A) first law.
B) second law.
C) third law.
Q:
A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat
A) moves in the direction of the wind impact force.
B) does not move by this wind impact.
C) moves, but in the opposite direction of the wind impact force.
Q:
The force of air impact upon the sail of a boat is greater if the air
A) bounces upon impact.
B) encounters the sail head-on.
C) encounters the sail at a grazing angle.
Q:
A karate chop is more effective if one's hand
A) follows through upon impact.
B) bounces upon impact.
C) extends the time upon impact.
Q:
The greater efficiency achieved with the curved blades of a Pelton wheel is due to
A) bouncing.
B) greater time of water impact.
C) rotational momentum.
D) divided impulse.
Q:
Which of these two collisions is more damaging; driving into a concrete wall with no "give," or colliding head-on with an identical car moving toward you at your same speed?
A) collision with the car
B) collision with the wall
C) both the same
Q:
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Q:
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Q:
A 1000-kg truck moving at 10 m/s that brakes to a stop in 5 s has an average braking force of
A) 1000 N.
B) 2000 N.
C) 3000 N.
D) 4000 N.
E) 5000 N.
Q:
A boxer punches a sheet of paper in midair from rest to a speed of 40 m/s in 0.05 s. If the mass of the paper is 0.01 kg, the force of the punch on the paper is
A) 0.08 N.
B) 0.8 N.
C) 8.0 N.
D) 80 N.
Q:
When a boxer moves into an oncoming punch, the force experienced is
A) decreased.
B) increased.
C) no different, but the timing is different.
D) all of the above
Q:
When a boxer is moving away from a punch, the force experienced is reduced because
A) momentum transfer is reduced.
B) the time of contact is increased.
C) the force is less effective.
D) all of the above
Q:
According to the impulse-momentum relationship Ft = change in mv, a falling baseball hits a player with a force F. The t in the equation is the time
A) the ball falls before hitting the player.
B) of contact of the ball hitting the player.
C) of reflex as the player responds to being hit.
D) all of the above
E) none of the above
Q:
According to the impulse-momentum relationship Ft = change in mv, a falling bungee jumper has momentum which is reduced by the forceF exerted by the bungee cord. If v is the speed of the jumper, then m in the equation is the mass of the
A) jumper.
B) cord.
C) ground below.
D) none of the above
Q:
Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of
A) lesser impulse in stopping.
B) longer time to stop.
C) both of these
D) none of the above
Q:
Padded dashboards in cars are safer in an accident than non-padded ones because a person hitting the dash has
A) increased time of contact.
B) decreased contact force.
C) both of these
D) neither of these
Q:
A car traveling along the highway brakes to a stop. A greater braking force is required when the car has
A) more mass.
B) more momentum.
C) less stopping distance.
D) all of the above
E) none of the above
Q:
When you can't escape being hit by a fast-moving object, you'll suffer a smaller force if the collision time is
A) long.
B) short.
C) the same way either way