Force: Friction

Force is a push or pull

• true

• false

A hypothesis is a testable question

• true

• false

A variable is

• what I change in the experiment

• what I keep the same in an experiment

What I keep the same in an experiment

• independent variable

• dependent variable

• controlled variables

Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students
• compare the ages of the students
• compare the distances that the ball rolled
• compare the number of times the ball was rolled

Pam ran down the sidewalk to school with her empty backpack. After school Pam’s backpack was loaded with books. Which best describes the force required to carry her book bag home?

• It took the same amount of force to carry the loaded book bag home.
• It took a greater amount of force to carry the loaded book bag home.
• It took a lesser amount of force to carry the loaded book bag home.

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Tags

NGSS.MS-PS2-2

Which of the following would increase the motion of a ball after it is kicked?

• a high, grassy surface
• a surface sloped uphill
• a surface sloped downhill

Why are new tires on a car better than older, worn tires?

• New tires have less mass than older tires.
• New tires are less affected by gravity than older tires.
• New tires allow the car to travel faster than older tires.
• New tires provide more friction on the road than older tires.

Which best describes the force of gravity?

• a pulling force
• a pushing force
• a change in mass
• a change in speed

Tags

NGSS.MS-PS2-4