23 terms

# 3. Physics Practice Questions Chapter 5

http://www.southernct.edu/~bidarian/phy1xx-chap5.htm
###### PLAY
A
1) Action and reaction forces comprise the parts of
A) a single interaction. B) two interactions.
E
2) An archer shoots an arrow. Consider the action force to be exerted by the bowstring against the arrow. The reaction to this force is the
A) weight of the arrow.
B) air resistance against the bow.
C) friction of the ground against the archer's feet.
D) grip of the archer's hand on the bow.
E) arrow's push against the bowstring.
B
3) A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the
A) player's grip on the glove.
B) force the glove exerts on the ball.
C) friction of the ground against the player's shoes.
D) muscular effort in the player's arms.
E) none of these.
C
4) A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
A) air resistance on the ball.
B) weight of the ball.
C) force of the ball against the bat.
D) grip of the player's hand against the ball.
E) none of these.
C
5) A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
A) less than 1000 N. B) more than 1000 N. C) 1000 N.
C
6) As a ball falls, the action force is the pull of the Earth's mass 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's mass on the Earth.
D) non-existent in this case.
E) none of these.
C
7) A person is attracted toward the center of the Earth by a 500-N gravitational force. The force of attraction of the Earth toward the person is
A) very very small. B) very very large. C) 500 N.
B
8) A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is actually
A) less than 3000 N. B) 3000 N.
C) more than 3000 N. D) ...there is really no way to say for sure.
C
9) Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by
A) Arnold, of course.
B) Suzie, surprisingly.
C) both the same, interestingly enough.
C
10) The Earth pulls on the moon. Similarly the moon pulls on the Earth, evidence that the
A) Earth and moon are simply pulling on each other.
B) Earth's and moon's pulls comprise an action-reaction pair.
C) both of these.
D) neither of these.
C
11) The attraction of a person's body toward the Earth is called weight. The reaction to this force is
A) the person's body pushing against the Earth's surface.
B) the Earth's surface pushing against the person's body.
C) the person's body pulling on the Earth.
D) none of these.
E
12) A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?
A) air resistance the diver encounters while falling
B) water resistance that will soon act upward on the diver
C) the attraction to the planets, stars, and every particle in the universe
D) all of these
E) none of these
C
13) A Mack truck and a Volkswagen traveling at the same speed collide head-on. The impact force is
A) greater on the Volkswagen.
B) greater on the Mack truck.
C) the same for both.
A
14) A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle to undergo the greatest change in velocity will be the
A) Volkswagen. B) Mack truck. C) both the same.
B
15) Two 10-newton weights are pulling on the spring scale as shown. The reading on the scale is
A) 0 N. B) 10 N. C) 20 N.
C
16) A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is
A) greater on the bug. B) greater on the car. C) the same for both.
D
17) The force exerted on the tires of a car to directly accelerate it along a road is exerted by the
A) engine.
B) tires.
C) air.
E) none of these.
A
18) Your 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 wall, no tricks. You
A) agree that it can't be done.
C) disagree, for a good punch easily delivers this much force.
B
19) A piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?
A) zero
B) 400 N
C) 600 N
D) 800 N
E) none of these
B
20) A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because
A) these forces are not an action-reaction pair.
B) nevertheless there is still an unbalanced force on the wagon.
C) the horse pulls on the wagon a brief time before the wagon reacts.
D) the wagon does not accelerate because these forces are equal and opposite.
E) unlike the horse, it is not alive.
B
21) Two people, one twice as massive as the other, attempt a tug-of- war with 12 meters 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.
D
22) Joe pushes Bill, who is asleep. Bill
A) will inevitably push Joe when he wakes.
B) pushes Joe, but not as hard.
C) does not push Joe.
D) pushes Joe equally hard.
A
23) As a bird sits on the limb of a tree, both the bird and the tree are moving about 30 km/s with respect to the sun. About 400 years ago, people philosophized that if the bird took 1 second to drop from the tree to a worm below, the worm would be 30 km downrange from the bird when it reached the ground. This was offered as evidence that the Earth does not revolve around the sun. This reasoning is best countered with Newton's
A) first law.
B) second law.
C) third law.
D) law of gravitation.
E) none of these.