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 friends make you stop.
• The size of your ice skates will determine how quickly you travel across the ice.

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

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 than 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 coninued in the same velocity but you have a different inertia.

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.