Newton's Law

Friction is a force that acts

• in the same direction as the motion of an object.
• opposite to the direction of the motion of an object.
• opposite to the applied forces on  an object.
• the same direction as the applied force on an object. 

What is Newton's Law of Inertia?

• F=ma
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion. 
• Friction 

Which law explains what happens when a magician pulls a tablecloth out from under dishes on a table without disturbing them?

• Law of Inertia
• Law of Acceleration
• Law of Action - Reaction
• Law of Forces

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According to Newton’s first law, what would happen to a baseball flying through the air if no unbalanced forces acted on it?

• The baseball would continue in the same direction with the same speed.
• The baseball would continue with the same speed, but its direction would change.
• The baseball would continue in the same direction, but its speed would decrease.
• The baseball would continue in the same direction, but its speed would increase.

A girl begins to slide down a playground slide. How will friction affect her as she slides?

• It will have no effect.
• It will slow her down. 
• It will prevent her from moving.
• It will make her go faster. 

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A man is driving in his car and runs into a log across the road. His car comes to a sudden stop. According to Newton’s law of inertia, what would happen to the man if he were not wearing his seat belt?

• He would not move.
• He would gain mass.
• He would continue to move forward.
• He would begin to move backward.

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Which statement best summarizes Newton’s Law of Action-Reaction?

• Friction slows objects.
• All forces act in pairs.
• Force equals mass times acceleration.
• An object in motion tends to stay in motion.

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Look at the picture. If Earth pulling the ball to the ground is the action force, what is the reaction force?

• The ball pulling the air. 
• The ball pulling Earth upward.
• The air pushing against the ball.
• The ball pushing against gravity.

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Look  at the picture. What is the reaction force when the box is moved?

• The boy pushing against the box
• The box pushing against the boy
• Friction pushing against the boy
• Friction slowing down the movement of the box.

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Given an equal force, lists the balls in order from least inertia to most inertia...

• tennis ball, table tennis ball, bowling ball, basketball
• table tennis ball, tennis ball, basketball, bowling ball
• basketball, tennis ball, bowling ball, table tennis ball
• bowling ball, table tennis ball, tennis ball, basketball

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