Grade 11 · Science · Physics

11th grade Static and kinetic friction worksheet

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Static and kinetic friction

Grade 11 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

A 5 kg box slides across a level floor with μk = 0.3. With g = 9.8 m/s², what is the kinetic friction force, Ari?
A 6 kg box slides across a level floor with μk = 0.4. With g = 9.8 m/s², what is the kinetic friction force, Bo?
A 20 kg box slides across a level floor with μk = 0.15. With g = 9.8 m/s², what is the kinetic friction force, Esme?
4.
“Free-body diagram (example data): a box pushed across the floor” In the free-body diagram, how big is the friction force, Jun?
- 0 N, since it is moving
- 12 N
- 58.8 N
5.
In the free-body diagram, how big is the static friction force, Kira?
- 0 N
- 5 N
- 196 N
6.
Which usually takes a bigger push: getting a heavy box started, or keeping it sliding, Noah?
- Getting it started
- They take the same push
- Keeping it sliding
7.
A box finally starts to slide. What happens to the friction force on it, Pia?
- It vanishes
- It jumps up
- It drops a little
8.
A block slides east across a table. Which way does friction act on it, Ren?
- East, with the motion
- Down into the table
- West
9.
A box rests on a ramp without sliding. Which way does friction act on it, Tala?
- Down the ramp, the way it would go
- Up the ramp
- Straight up
10.
A puck slides north across rough ice. Which way does friction act on it, Zee?
- South
- North
- East

Static and kinetic friction. Every version has 10 questions, and the answer key prints on the second page.

I can find kinetic friction, f = μk N, with N = mg on level ground, and use it in F = ma for a sliding box.
I can explain static friction. It matches the push up to μs N, then the box slides. It is usually larger than kinetic friction.
I can find μ from a constant-velocity pull, or from the slope of friction plotted against normal force.
I can predict how pressing down, pulling up at an angle, loads, wheels, sand and steel runners change friction. Friction points against the sliding.

Standard: HS-PS2-1

static friction: Friction holding surfaces that aren't sliding; up to μs N

kinetic friction: Friction between sliding surfaces: μk N

coefficient of friction μ: A number for how grippy two surfaces are; no unit

normal force: The surface's push straight out from itself

constant velocity: No acceleration, so the forces balance

Your child used the mass as the normal force. On level ground the normal force is the weight, m × 9.8, in newtons.

Your child left friction out. Subtract the friction force from the push before using F = ma.

Your child used the most static friction can give. Static friction only matches the push, up to its limit μs N.

What is the most common mistake with static and kinetic friction?

Your child used the mass as the normal force. On level ground the normal force is the weight, m × 9.8, in newtons.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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