(Savvas 12.1) Chapter 12: Forces and Motion

A force is defined as a(n) __________ or a(n) __________ that acts on an object.

• force, influence

• push, pull

• action, reaction

• movement, motion

Tags

NGSS.MS-PS2-1

Is the following sentence 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

Tags

NGSS.MS-PS2-2

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

• By changing its speed

• By changing its direction

• By changing either its speed or direction or both.

• By not affecting it at all

Tags

NGSS.MS-PS2-2

What force causes a 1-kg mass to accelerate at a rate of 1 meter per second each second?

• 1 kg/m*s^2

• 1 kg/s

• 1 kg*m

• 1 newton

Tags

NGSS.HS-PS2-1

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

• Balanced forces do not change the motion of an object, while unbalanced forces do.

• Balanced forces change the motion of an object, while unbalanced forces do not.

• Both balanced and unbalanced forces change the motion of an object.

• Neither balanced nor unbalanced forces change the motion of an object.

Tags

NGSS.MS-PS2-2

Is the following sentence true or false? Friction is a force that helps objects that are touching move past each other more easily.

• True

• False

Select the letters that identify types of friction.

• a. rolling

• b. gravity

• c. static

• d. sliding

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

• static

• kinetic

• rolling

• fluid

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

• Because of inertia, which resists changes in motion.

• Because moving objects have less mass.

• Because static friction is usually greater than kinetic friction.

• Because moving objects require no force to keep moving.

Friction Force: Static, Example: Pushing a book along your desk.

Friction Force: Rolling, Example: ____.

• Rolling a ball

• Sliding a box

• Dragging a sled

• Pushing a cart