Understanding Newton's First Law

Can you give an example of inertia?

• A soccer ball will always move when kicked.

• A book falling off a table is an example of inertia.

• A soccer ball at rest will not move until kicked.

• A car accelerating on a highway is an example of inertia.

What happens to a ball when you stop rolling it?

• The ball changes color.

• The ball stops moving.

• The ball rolls faster.

• The ball bounces higher.

Why do passengers lurch forward in a car that suddenly stops?

• Passengers are thrown backward due to acceleration.

• Passengers lurch forward due to inertia when the car suddenly stops.

• The car's brakes create a vacuum effect.

• Passengers are pushed back by the seatbelt.

What is an example of an object at rest?

• A person walking down the street.

• A dog running in the park.

• A book lying on a table.

• The rotation of a ceiling fan.

Why do we feel pushed back in our seats when a bus accelerates?

• We feel pushed back in our seats due to inertia.

• The seats are designed to push us forward.

• The bus is moving downhill.

• We are experiencing a sudden drop in pressure.

What happens to a book on a table when you pull the tablecloth?

• The book may slide off the table or remain in place.

• The book will become a different object.

• The book will instantly disappear.

• The book will float in the air.

A driver stops suddenly at a red light. He is thrown forward against the seatbelt. Why?

• A force pushes him forward when he stops.

• The force of the seatbelt pushes him backwards.

• A force pushes the whole car forward, including the driver.

• 
  The force of the brakes stops the car, but not the driver.

A car moves at a constant speed without changing direction. What HAS to be true about the forces on the car?

• A force is pushing the car in the direction it's moving.

• The forces on the car are not balanced.

• The forces on the car are balanced.

• Forces push on the car in all directions.

A ball is sitting still on a plate. How could the ball start moving?

• The ball's inertia disppears.

• All the forces on the ball stop.

• A new, balanced force acts on the ball.

• A new, unbalanced force acts on the ball.

An astronaut in outer space away from gravitational or frictional forces throws a rock. The rock will...

• gradually slow to a stop

• continue moving in a straight line at constant speed

• It hass more volume

• only object at rest