Newton's First Law-Inertia

While you’re ice-skating with your friends, you push off from one end of the rink and slide forward. Based on Newton’s first law of motion, what is true?

• You will lose your balance and fall over before you reach the middle of the ice rink.

• You will continue to slide across the ice until a force makes you stop or change direction.

• The force of gravity will make you keep your velocity until your friend makes you stop.

• The size of your ice skates will determine how quickly or slowly you travel across the ice.

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How is velocity different from speed?

• Velocity is when an object goes in reverse.

• Velocity is the direction an object moves in, and it has nothing to do with speed.

• Velocity is speed and direction together.

• Velocity is not at all different from speed.

What does friction do to a moving object?

• makes it rise

• slows it down

• speeds it up

• all of the above

Your friend kicks a soccer ball, and it stops a few feet from you. What needs to happen to it in order for it to return to your friend?

• Friction has to be applied to the ball.

• Force has to be applied to the ball

• Speed has to be applied to the ball

• Inertia has to be applied to the ball

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What is the relationship between heavy objects and inertia?

• Only heavy objects have inertia

• Heavy objects have no inertia

• Heavy objects have less inertia

• Heavy objects have more inertia

You are riding in the car with your grandfather, and he turns left. Why do you shift to the right?

• It takes you a moment to catch up with the new velocity of the car.

• You have more inertia that the car, so it takes longer for you to turn left.

• You had been sitting at rest until the force of the turn set you in motion.

• The car continued in the same velocity, but you had a different inertia.

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What does the second part of Newton’s first law say about objects at rest?

• They cannot move unless they have a lot of friction.

• If they are heavy, they will stay at rest, but if they are light, they will move.

• They will stay at rest unless an outside force makes them move.

• They have more inertia than objects in motion.