Ch. 12.1 - Forces

Ch. 12.1

Forces

Fill in the Blank

A force is defined as a push or a _ that acts on an object.

Multiple Choice

True or False? A force can act to cause an object at rest to move or it can accelerate an object that is already moving.

• True

• False

Open Ended

How can a force change the motion of an object that is already moving?

Fill in the Blank

The overall force acting on an object after all the forces are combined is called the _.

Open Ended

How do balanced and unbalanced forces affect the motion of an object?

Multiple Choice

True or False? Friction is a force that helps objects that are touching move past each other more easily.

• True

• False

Multiple Select

Select the choices that identify the different types of friction.

• Rolling

• Gravity

• Static

• Sliding

Fill in the Blank

The friction force that acts on objects that are at rest is _.

Open Ended

Why is less force needed to keep an object moving than to start the object in motion?

Fill in the Blank

Gravity is an _ force that pulls objects together.

Multiple Choice

True or False? Earth's gravity acts downward toward the center of Earth.

• True

• False

Multiple Choice

True or False? Terminal velocity is the constant velocity of a falling object when the force of air resistance equals the force of gravity.

• True

• False

Fill in the Blank

The curved path caused by the combination of an initial forward velocity and the downward force of gravity is known as _ motion.