Friction Answers

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The chart describes four objects experiencing one or more frictional forces.

Question illustration
A
The bike has rolling friction, the sled and the motorcycle have sliding friction, and the elephant has static friction.
B
The bike and sled have sliding friction, and the motorcycle and elephant have static friction.
C
The bike has static friction, the sled and elephant have sliding friction, and the motorcycle has rolling friction.
D
The bike and motorcycle have rolling friction, the sled has static friction, and the elephant has sliding friction.
4

Olivia bought new gym shoes to play volleyball because she kept slipping when she ran in her old shoes. How will the new soles help solve the problem?

A
by increasing her speed to increase friction
B
by adding surface roughness to increase friction
C
by improving aerodynamics to decrease friction
D
by increasing lubrication to decrease friction
5

Aria is riding her bike. She is bent slightly over, holding onto her handlebars. She wants to go faster.

A
She should bend her hips so her head is closer to the handlebars.
B
She should sit straight up on the bike, keeping her arms tight to her body.
C
She should spread her arms wide while sitting straight in her seat.
D
She should flap her arms up and down like a bird.
6

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.

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

Which surface most likely has the least friction?

A
a carpeted floor
B
a paved road
C
a rocky path
D
a water slide
10

The city is using sand trucks to place sand on the road during icy conditions. Which best explains the use of sand?

A
The sand increases friction by increasing surface area.
B
The sand increases friction by increasing roughness.
C
The sand decreases friction by increasing surface area.
D
The sand decreases friction by increasing roughness.

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