Conceptual Physics Ch.5

An axe is swung against a tree with a blow of 4000N. The force that acts on the axe during this event is A. Less then 4000N. B. 4000N. C. Greater than 4000N. D. 0.

B. 4000N.

A piece of rope is pulled by 2 people in a tug-of-war. Each exerts a 400N force. What is the tension on the rope? A.800N B. 400N C. 600N D. Zero E. None of the above

B. 400N

When neck of an air filled balloon is untied and air escapes, the balloon shoots through the air. The force that propels the balloon is provided by the A. Surrounding air. B. Ejected air. C. Air still in the balloon. D. Ground beneath the balloon.

B. Ejected air.

Two identical carts have a compressed spring between them. When the spring is release, the carts recoil from each other with oppositely directed acceleration that are A. Almost equal. B. Equal. C. Unequal. D. Zero.

B. Equal.

If action is a foot kicking a soccer ball, the reaction is an equal force on the A. Ball B. Foot C. Ground D. Air drag of motion

B. Foot

A player hits a ball with a back the action force is impact of the back against the ball the reaction to this force is the A. Weight of the bat. B. Force that the ball exerts on the bat. C. Weight of the ball. D. Air resistance on the ball. E. Grip of the player's hand against the ball.

B. Force that the ball exerts on the bat.

For an action force, there must be a reaction force that A. Is exactly equal in magnitude. B. Is slightly smaller in magnitude than the action force. C. Always acts in the same direction. D. Is slightly larger in magnitude than the action force.

A. Is exactly equal in magnitude.

How does the force of the rifle compare with the force on the bullet, and why? A. The magnitude of the force of the rifle is equal to the magnitude of the force on the bullet and the forces are in the opposite directions because for every action there is an equal and opposite reaction. B. The magnitude of the force of the rifle is equal to the magnitude of the force on the bullet and both forces are in the same direction because for every action there is an equal reaction. C. The force on the rifle is greater than the force on the bullet because the mass of the rifle is greater. D. The force on the rifle is less than the force on the bullet because the mass of the rifle is greater.

A. The magnitude of the force of the rifle is equal to the magnitude of the force on the bullet and the forces are in the opposite directions because for every action there is an equal and opposite reaction.

A boxer cannot exert much force on a piece of tissue paper suspended in the air because A. The tissue paper has too little mass to exert much force on the boxer's fist. B. The tissue lacks enough strength. C. There is little follow-through with the punch. D. The time of a interaction is too brief.

A. The tissue paper has too little mass to exert much force on the boxer's fist.

A massive truck and a golf cart have a head-on collision with equal amounts of force. The least amount of acceleration occurs for A. The truck. B. The cart, if it is initially at rest. C. The cart, whether at rest or moving. D. Neither, for they undergo the same acceleration.

A. The truck.

When you push against a wall what pushes back A. The wall. B. Your fingers. C. Nothing. D. Your hand.

A. The wall.

How many forces are required for an interaction? A. Two forces, an action and reaction, are needed for and interaction. B. One force, a reaction, is needed for an interaction. C. One force, an action, is needed for an reaction. D. Two forces, a contact force and the friction force, are needed for an interaction.

A. Two forces, an action and reaction, are needed for and interaction.

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the A. Volkswagen. B. Same for both. C. Mack truck.

A. Volkswagen.

To produce a net force on a system must there be an externally applied net force? A. Yes, there must be an external net force on the system. B. Yes. To accelerate, the internal reaction forces must be zero. C. No. To accelerate, the internal action forces must not equal the internal reaction forces. D. No, an internal net force is sufficient.

A. Yes, there must be an external net force on the system.

Fill in the blanks: Newton's 1st law is often called the law of ___________; Newton's second law is the law of ____________; and Newton's third law is the law of ____________. A. Acceleration, inertia, action-reaction B. Inertia, acceleration, action-reaction C. Inertia, net force, friction D. Action, inertia, force

B. Inertia, acceleration, action-reaction

A net force on a kicked soccer ball can be zero when A. Action and reaction both act on the ball. B. It is kicked by two feet with equal and opposit amount of force. C. And it is kicked in the same direction by two feet. D. It is kicked by two feet at right angles to each other.

B. It is kicked by two feet with equal and opposit amount of force.

The amount of force with which a boxer's punch lands depends on the A. Physical condition of the boxes. B. Mass of what's being hit. C. Boxer's attitude. D. None of these.

B. Mass of what's being hit.

When hitting a tennis ball with your racket the force on the ball has the same magnitude as the force on the A. Hand that holds the raquet. B. Raquet. C. Player D. Raquet, and in the same direction.

B. Raquet.

A boulder falls due to gravity their reaction to the force on the Boulder is A. Air resistance B. The boulder pulling up on the Earth C. The boulder being pulled downward by the Earth. D. Actually, all of these.

B. The boulder pulling up on the Earth

How does the distance traveled by the bullet compare with the distance traveled by the rifle in the same time, and why? A. The rifle will travel farther than the bullet because it has a greater magnitude of acceleration. B. The bullet will travel farther than the rifle because it has a greater magnitude of acceleration. C. The bullet will travel the same distance as the rifle because they have equal magnitudes of acceleration.

B. The bullet will travel farther than the rifle because it has a greater magnitude of acceleration

A Volkswagen bug and Volvo truck have a head-on collision. Which statement is true? A. Both forces are identical. B. The magnitudes of both forces are the same. C. The greater force acts on the Volkswagen bug. D. A greater force acts on the Volvo track.

B. The magnitudes of both forces are the same

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. The person's body pulling on the Earth. C. The Earth's surface pushing against the person's body. D. None of these.

B. The person's body pulling on the Earth.

Earth pulls on the Moon with a certain force. Relative to this force, the pull of the Moon on the Earth is A. A little less. B. The same. C. A little greater. D. Much less.

B. The same.

When a sqid pushes against water, the squid moves forward because the water A. Offers no resistance. B. Exerts a net backward force. C. Exerts a net forward force. D. Has the same density as the fish.

C. Exerts a net forward force.

In the apple-pulling-the-orange sequence in this chapter, what is the force that accelerates the system across the floor? A. The backward pull of the orange. B. Internal forces. C. Friction between the apple and the floor. D. The resistance to motion by the orange.

C. Friction between the apple and the floor.

When you jump vertically upward strictly speaking you caused the Earth to A. Also move upward with you. B. Remain stationary. C. Move downward. D. Move sideways a bit.

C. Move downward.

As a ball falls, the action force is the pull of the Earth on the ball. The reaction force is the A. Acceleration of the ball. B. Air resistance acting against the ball. C. Pull of the ball's mass on the Earth. D. None of these.

C. Pull of the ball's mass on the Earth.

The team that when in a tug-of-war is the team that A. Has the greater self confidence. B. Pulls with the greater force C. Pushes harder on the floor while holding the rope. D. Yanks the rope.

C. Pushes harder on the floor while holding the rope.

When you walk you push the floor to the left and the floor A. Both of these simultaneously B. Can only wish a good push on you C. Pushes you to the right D. Also pushes you to left E. None of the above

C. Pushes you to the right

How does the magnitude of acceleration on the rifle compare with the magnitude of acceleration of the bullet, and why? A. The magnitude of acceleration of the rifle is greater than the magnitude of acceleration of the bullet. Even though they experience the same magnitude of force, the mass of the rifles greater, and so the rifle will experience a greater acceleration than the bullet. B. The magnitude of acceleration of the rifle is equal to the magnitude of acceleration of the bullet because they experienced the same magnitude of force. C. The acceleration of the rifle is smaller then the acceleration of the bullet. They experience the same magnitude of force, but the mass of the rifle is greater, and so the rifle will experience a smaller acceleration than the bullet.

C. The acceleration of the rifle is smaller then the acceleration of the bullet. They experience the same magnitude of force, but the mass of the rifle is greater, and so the rifle will experience a smaller acceleration than the bullet.

The force that propels of heavy truck along a highway is provided by A. Gravity. B. Newton's law of motion. C. The highway pushing back on the wheels of the truck. D. The air drag acting on the truck.

C. The highway pushing back on the wheels of the truck.

The force that propels a rocket is the force provided by A. Decreased mass. B. Energetic reactions as the fuel is burned. C. They expelled gas pushed on the rocket. D. Ejected fuel.

C. They expelled gas pushed on the rocket.

Arnold Strongman and Susie Small each pull very hard on an opposit ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by A. Suzie, surprisingly. B. Arnold, of course. C. both the same, interestingly enough.

C. both the same, interestingly enough.

When one object exerts a force on the 2nd object the 2nd object exerts a force on the 1st that A. Is opposit in direction. B. Is equal in magnitude. C. Occurs at the same time. D. All of these.

D. All of these.

Can you physically touch a person without that person touching you with the same amount of force? A. Yes when a have your person touches a light a person the lighter person touches back with less force. B. Yes, you can touch a person while they choose to not touch you back. C. Yes, when you touch a person, they touch you back with a force that is slightly less due to friction. D. No, when you touch a person, they must touch you with the equal and opposite force.

D. No, when you touch a person, they must touch you with the equal and opposite force.

A mosquito has a collision with a windshield of a massive high speed truck. The force of impact on the mosquito is _________ the force on the truck, and the acceleration of the mosquito is __________ the deceleration of the track. A. Less than; less than B. More than; less than. C. The same as; less than D. The same as; more than

D. The same as; more than