Pretest Answers

8 verified answers
1
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Which methods reduce friction?

A
using sticky materials
B
increasing surface roughness
C
increasing speed
D
lubricating surfaces
2
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Which surface most likely has the least friction?

A
a rocky path
B
a carpeted floor
C
a paved road
D
a water slide
3

Which type of friction acts on an object that is not moving?

A
static friction
B
sliding friction
C
rolling friction
D
fluid friction
5

Myron was trying to light a match. The first time he struck the match, the match did not light. The second time he tried, the match lit successfully. Which most likely occurred to make the match light?

A
Myron increased the friction by decreasing the surface area.
B
Myron decreased the friction by lubricating the match.
C
Myron increased the friction by increasing speed.
D
Myron decreased the friction by making the match aerodynamic.
7

Aria is riding her bike. She is bent slightly over, holding onto her handlebars. She wants to go faster. Which best explains what she should do?

A
She should flap her arms up and down like a bird.
B
She should sit straight up on the bike, keeping her arms tight to her body.
C
She should bend her hips so her head is closer to the handlebars.
D
She should spread her arms wide while sitting straight in her seat.

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Pretest Answers — Physical Science