Newton's Laws Quiz

A force must be applied to an object to do all of the following EXCEPT

• maintain a constant speed

• slow down

• turn

Objects tend to resist changes in motion. This property is called:

• potential energy

• inertia

• weight

• momentum

A tow truck pulls a 2,000-kilogram car with a net force of 4,000 Newtons. What is the acceleration of the car?

• 2,000 m/s²

• 200 m/s²

• 2 m/s²

• 0.5 m/s2

A car is traveling down a straight stretch of highway at 90 kilometers per hour. The driver suddenly slams on the brakes and brings the car to a quick stop. As a result, the unbelted passengers will at first:

• be pushed against the back of a seat

• be pushed against the door on the passenger side

• continue to move forward in a straight line

• come to a stop at the same time as the car

A cart is rolling down a special ramp where there is no friction at all. What will happen if the amount of mass on the cart is increased?

• The cart will move at a constant velocity.

• The cart's acceleration will not be affected.

• The cart will accelerate less.

• The cart will accelerate more.

A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the book from accelerating downward at 9.8 m/sec2?

• The table presses back up on the book with an equal and opposite force of 20 newtons.

• The table presses back up on the book with a force greater than 20 newtons.

• The table and the book together are accelerating downwards at 9.8 m/sec2.

• The inertia of the book holds it up.

When the forces on an object are balanced, we say that the object:

• must be moving at a constant speed.

• must be at rest.

• is accelerating.

• is in equilibrium.

Why do you lean toward the right when a car turns left?

• because of inertia

• because of buoyancy

• because of gravity

• because of velocity