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Physic
Q:
When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, the contact time is about 10 times more than for a stiff-legged landing and the average force your body experiences is reduced by
A) less than 10 times.
B) more than 10 times.
C) about 10 times.
Q:
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is
A) zero.
B) less than the force applied to the cement block.
C) the same as the force applied to the block.
D) more than the force applied to the block.
E) need more information
Q:
To catch a fast-moving softball with your bare hand, you extend your hand forward just before the catch and then let the ball ride backward with your hand. Doing this reduces the catching force because the
A) relative velocity is less.
B) relative velocity is more.
C) time of catch is increased.
D) time of the catch is decreased.
E) none of the above
Q:
The force of a falling apple hitting the ground depends upon
A) the speed of the apple just before it hits the ground.
B) the time of contact with the ground.
C) whether or not the apple bounces.
D) all of the above
Q:
When Peter tosses an egg against a sagging sheet, the egg doesn't break due to
A) reduced impulse.
B) reduced momentum.
C) both of these
D) neither of these
Q:
The distinction between impulse and force involves the
A) distance the force acts.
B) time the force acts.
C) difference between acceleration and velocity.
D) mass and its effect on resisting a change in momentum.
Q:
The impulse-momentum relationship is a direct result of
A) Newton's first law.
B) Newton's second law.
C) Newton's third law.
Q:
It is correct to say that impulse is equal to
A) momentum.
B) the change in momentum.
C) the force multiplied by the distance the force acts.
D) all of the above
E) none of the above
Q:
What is the mass of a ball moving at 4 m/s with a momentum of 48 kg m/s?A) 4 kgB) 12 kgC) 48 kgD) 192 kgE) none of the above
Q:
What is the mass of a ball moving at 3 m/s with a momentum of 48 kg m/s?A) 4 kgB) 12 kgC) 16 kgD) 144 kgE) none of these
Q:
What is the speed of a 6-kg ball with a momentum of 72 kg m/s?A) 3 m/sB) 4 m/sC) 12 m/sD) 48 m/sE) none of the above
Q:
What is the speed of a 4-kg ball with a momentum of 12 kgm/s?
A) 3 m/s
B) 4 m/s
C) 12 m/s
D) 48 m/s
E) none of the above
Q:
Bronco's speed increases after he dives from a hovering helicopter. Relative to an observer in the helicopter Bronco's momentum
A) also increases.
B) remains unchanged.
C) decreases.
Q:
A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater
A) speed.
B) acceleration.
C) momentum.
D) all of the above
E) none of the above
Q:
When you simultaneously drop a light tennis ball and a heavy bowling ball, they hit the floor
A) at the same speed.
B) with the same force.
C) with the same momentum.
D) all of the above
E) none of the above
Q:
An iron ball and wooden ball of the same size are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed.
B) acceleration.
C) momentum.
D) all of the above
E) none of the above
Q:
The change in momentum of an object is equal to the
A) force acting on it.
B) change in its velocity.
C) object's mass times the force acting on it.
D) impulse that acts on it.
E) all of the above
Q:
An object in motion is an object that has
A) acceleration.
B) impulse.
C) momentum.
D) all of the above
E) none of the above
Q:
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
A) zero.
B) doubled.
C) quadrupled.
D) unchanged.
Q:
When you ride your scooter you have momentum. When you ride twice as fast you have
A) almost twice the momentum.
B) twice the momentum.
C) four times the momentum.
D) none of the above
Q:
A physicist says that a car accelerating along a level road is being propelled by the road. Defend this statement.
Q:
Why will girls wearing gym shoes win in a tug-of-war against boys wearing socks while the activity occurs on a smooth floor?
Q:
A falling boulder experiences a force, which is responsible for its acceleration. What is the reaction to this force? How can this question be better phrased?
Q:
When a boulder and a pebble are dropped, why does the pebble pick up speed as quickly as the boulder, even though less gravity acts on it? In other words, why do both accelerate equally?
Q:
How does the equilibrium rule, F = 0, relate to Newton's first law of motion?
Q:
If you drop a pencil while riding on a smooth riding bus, why does the pencil land at the same place it would if the bus were at rest?
Q:
The force of a boxer's punch is greater when it hits a
A) small punching bag.
B) heavy punching bag.
C) both forces would be the same for the same effort
Q:
A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no tricks. You
A) agree that it can't be done.
B) have reservations about this assertion.
C) disagree, for a good punch easily delivers this much force.
Q:
Two people, one twice as massive as the other, attempt a tug-of-war with 12 m of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
A) 3 m.
B) 4 m.
C) 5 m.
D) 6 m.
Q:
Both ends of a piece of rope are pulled by two people in a tug-of-war. If each pulls with a 400-N force, the tension in the rope is
A) 0 N.
B) 400 N.
C) 600 N.
D) 800 N.
E) none of the above
Q:
Arnold Strongman wearing socks and Suzie Small in gym shoes have a tug-of-war on a polished floor. The likely winner is
A) Arnold.
B) Suzie.
C) neither, a tied score
D) no basis for predicting
Q:
Arnold Strongman and Suzie Small each pull on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
A) Arnold.
B) Suzie.
C) same by each
Q:
The force exerted on the tires of a car to directly accelerate the car along a road is exerted by the
A) engine.
B) tires.
C) air.
D) road.
E) none of the above
Q:
A Mack truck and a Mini Cooper traveling at the same speed collide head-on. The vehicle to undergo the greatest change in velocity will be the
A) Mini Cooper.
B) Mack truck.
C) same
Q:
A Mack truck and a Mini Cooper traveling at the same speed collide head-on. The collision force is greatest on the
A) Mini Cooper.
B) Mack truck.
C) same on both
Q:
Nellie whirls a tether ball in a horizontal circular path over her head. If the action force is Nellie pulling on the string, the reaction force is
A) Nellie pulling on the string.
B) the string pulling on Nellie.
C) the ball pulling on the string.
D) none of the above
Q:
A vase sits at rest on a table. If the action force is Earth pulling downward on the vase, the reaction force is the
A) table pushing upward on the vase.
B) vase pulling upward on Earth.
C) vase pulling upward on both the table and Earth.
D) none of the above
Q:
Action and reaction pairs of forces always act on
A) the same body.
B) different bodies.
C) either of these
D) none of the above
Q:
The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is
A) air resistance the skydiver encounters while falling.
B) Earth pulling upward on the skydiver.
C) the attraction to the planets, stars, and every particle in the universe.
D) all of the above
E) none of the above
Q:
The attraction of a person's body toward Earth is called weight. The reaction to this force is
A) the person's body pushing against Earth's surface.
B) Earth's surface pushing against the person's body.
C) the person's body pulling on Earth.
D) none of the above
Q:
Earth pulls on the Moon. Similarly the Moon pulls on Earth, evidence that
A) Earth and Moon pull on each other.
B) Earth's and Moon's pulls comprise an action-reaction pair.
C) both of the above
D) none of the above
Q:
For a falling ball the action force is the pull of Earth on the ball. The reaction force is the
A) air resistance acting against the ball.
B) acceleration of the ball.
C) pull of the ball on Earth.
D) nonexistent.
E) none of the above
Q:
Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
A) zero.
B) 250 N.
C) 500 N.
D) 1000 N.
E) none of the above
Q:
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove.
B) force of the glove on the ball.
C) friction of the ground against the player's shoes.
D) muscular effort in the player's arms.
E) none of the above
Q:
An archer shoots an arrow. If the action force is the bowstring on the arrow, the reaction is the
A) weight of the arrow.
B) air resistance on the bow.
C) friction of the ground on the archer's feet.
D) grip of the archer's hand on the bow.
E) arrow's push on the bowstring.
Q:
The emphasis of the orange-and-apple sequence in your text is
A) to define systems.
B) that actions equal reactions.
C) that forces produce accelerations.
D) defining friction as a force.
E) that mass is not a force.
Q:
A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the
A) bug.
B) car.
C) same for both
Q:
When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of
A) less than 1000 N.
B) more than 1000 N.
C) 1000 N.
Q:
A martial arts person breaks a board with a blow of 3000 N. The force that acts on the hand is
A) less than 3000 N.
B) 3000 N.
C) more than 3000 N.
D) not enough information
Q:
Earth exerts a force on the Moon. These two bodies make up
A) one interaction.
B) two interactions.
C) multiple interactions.
Q:
A player hits a ball with a bat. If one part of the interaction is the bat against the ball, the other part is the
A) air resistance on the ball.
B) weight of the ball.
C) ball against the bat.
D) grip of the player's hand against the ball.
E) none of the above
Q:
Action and reaction forces are parts of
A) a single interaction.
B) a pair of interactions.
C) multiple interactions.
Q:
When you rub your hands together, you
A) can push harder on one hand than the other.
B) cannot push harder on one hand than the other.
C) need more information
Q:
You cannot exert a force on a wall
A) if the wall resists.
B) unless you put your mind to it.
C) unless the wall simultaneously exerts the same amount of force on you.
Q:
To say there is no such thing as only one force means
A) there must also be an oppositely directed force.
B) other forces, perhaps not evident, are there.
C) gibberish.
Q:
A math book and a science book are tied together with a length of string. With the string taut, one book is pushed off the edge of a table. As it falls, the other book is dragged horizontally across the table surface. With no friction, acceleration of the books is
A) zero.
B) g/2.
C) g.
D) between zero and g.
E) greater than g.
Q:
What applied horizontal force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
A) 600 N
B) 1600 N
C) 2000 N
D) 2400 N
E) none of the above
Q:
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. Air resistance just before they hit is greater for the
A) regular ball.
B) lead-filled ball.
C) same for both
Q:
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the
A) regular ball.
B) lead-filled ball.
C) same for both
Q:
As drops fall from a leaky faucet they become
A) closer together as they fall.
B) farther apart as they fall.
C) a fixed distance apart as they fall.
D) none of the above
Q:
If you drop an object, it will accelerate downward at a rate of 10 m/s2. If you instead throw it downward, its acceleration (in the absence of air resistance will be
A) less than 10 m/s2.
B) 10 m/s2.
C) greater than 10 m/s2.
Q:
A parachutist steps from a hovering helicopter and falls for 5 s before reaching terminal velocity. During this 5-s interval, her acceleration
A) is constant.
B) increases.
C) decreases.
D) is zero.
E) none of the above
Q:
A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases.
B) decreases.
C) remains unchanged regardless of air resistance.
Q:
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is
A) 0 m/s2.
B) 5 m/s2.
C) 10 m/s2.
D) infinite.
E) none of the above
Q:
A skydiver who weighs 500 N reaches terminal velocity at 90 km/h. The air resistance on the skydiver is
A) 90 N.
B) 250 N.
C) 410 N.
D) 500 N.
E) none of the above
Q:
A big and a small person wish to parachute at equal terminal velocities. The big person should
A) jump first.
B) jump lightly.
C) pull upward on the supporting strands to decrease the downward net force.
D) get a larger parachute.
E) none of the above
Q:
A light woman and a heavy man jump from an airplane at the same time and open their samesize parachutes at the same time. Which person reaches a state of zero acceleration first?
A) the light woman
B) the heavy man
C) both at the same time
D) not enough information
Q:
An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball.
B) heavier iron ball.
C) both hit at the same time.
D) not enough information
Q:
The acceleration of a rocket increases as it travels upward from the ground mainly because
A) gravity becomes weaker with increased distance.
B) the applied force on the rocket increases as fuel is burned.
C) the mass of the rocket decreases as fuel is burned.
Q:
A falling object that has reached its terminal speed continues to gain
A) acceleration.
B) speed.
C) both of these
D) none of the above
Q:
When a falling object has reached its terminal velocity, its acceleration is
A) constant.
B) zero.
C) g.
Q:
The air resistance of falling is greatly affected by an object's frontal area and
A) mass.
B) weight.
C) speed.
Q:
When an object falls through the air, as velocity increases the net force
A) increases.
B) decreases.
C) remains the same whether in air or in a vacuum.
Q:
When a 500-N parachutist opens his chute and experiences 800 N of air resistance, the net force on him is
A) 300 N downward.
B) 500 N downward.
C) 800 N downward.
D) 300 N upward.
E) 500 N upward.
Q:
A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is halfway to the top of its path is
A) 1/2 N.
B) 1 N.
C) 5 N.
D) 7.5 N.
E) 10 N.
Q:
If an object falls with constant acceleration, the velocity of the object must
A) be constant also.
B) continually change by the same amount each second.
C) continually change by varying amounts, depending on its speed.
D) continually decrease.
E) none of the above
Q:
When a rock thrown straight up reaches the exact top of its path, its velocity is
A) zero and its acceleration is zero.
B) zero and its acceleration is 10 m/s2.
C) about 10 m/s and its acceleration is zero.
D) about 10 m/s and its acceleration is 10 m/s2.
Q:
A stone is thrown vertically upward. At the top of its vertical path its acceleration is
A) zero.
B) 10 m/s2.
C) somewhat less than 10 m/s2.
D) undetermined.
Q:
A stone is thrown vertically upward. At the top of its vertical path the force acting on it is
A) zero.
B) only the force due to gravity.
C) due to air resistance.
D) both due to gravity and air resistance.
Q:
A ball is thrown vertically upward. At the top of its vertical path, its velocity is
A) 0 m/s.
B) 10 m/s.
C) between 0 m/sand 10 m/s.
D) greater than 10 m/s.
E) none of the above