Friction

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

The amount of friction depends on the weight of the objects pressing together.

• True
• False

A type of friction that occurs when air pushes against a moving object causing it to decelerate.

• surface area
• air resistance
• velocity
• gravity 

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

Tags

NGSS.MS-PS2-1

What direction does friction act relative to motion?

• in the same direction
• in the opposite direction 
• need more information
• depends on the force

What type of friction is not moving?

• static
• sliding
• kinetic
• rolling

Tags

NGSS.MS-PS2-2

True/False:  Everything has friction.

• True
• False

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.
• The marble’s speed would increase.
• The marble would stop immediately. 
• The marble would remain at constant speed.

Tags

NGSS.MS-PS2-2

What is a type of friction that occurs when air pushes against a moving object?

• surface area
• air resistance
• velocity
• gravity