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Chap 8 Review

Chap 8 Review

Assessment

Presentation

Physics

10th - 12th Grade

Easy

NGSS
HS-PS2-1, MS-PS2-2, MS-PS2-4

Standards-aligned

Created by

Kurt Trout

Used 2+ times

FREE Resource

5 Slides • 9 Questions

1

Chap 8 Review

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2

Chap 8.1

  • angular displacement x=rƟ

  • angular velocity w=Δω/ΔΤ

  • acceleration a=rα

  • Angular acceleration α=Δω/ΔΤ

  • Distance X=rΘ

  • Velocity V=rω

3

Multiple Choice

If a truck has a linear acceleration of 1.85 m/s2 and the wheels have an angular acceleration of 5.23 rad/s2, what is the diameter of the truck’s wheels?

1

0.707

2

9.68

3

2.83

4

Multiple Choice

The outer edge of a truck tire that has a radius of 45 cm has a velocity of 23 m/s. What is the angular velocity of the tire in rad/s

1

0.51 rad.sec

2

51 rad/sec

3

1.96 rad/sec

5

Remember, to change rev/min

  • multiply rev x 2 π

  • then make sure to divide by correct time

6

Multiple Choice

In the spin cycle of a clothes washer, the drum turns at 635 rev/min. If the lid of the washer is opened, the motor is turned off. If the drum requires 8.0 s to slow to a stop, what is the angular acceleration of the drum?

1

79 rad/sec

2

498 rad/sec

3

8.3 rad/sec

7

Multiple Select

An airplance propeller slows from 475 rev/min to 187 rev/min in 4.00 s. What is its angular acceleration?

1

72 rad/s2

2

30 rad/s2

3

7.54 rad/s2

8

Multiple Choice

You are doing your laundry. When the washing machine goes into its spin cycle, the tub starts from an angular speed of 2.30 rad/s. It then speeds up smoothly for 8.00 s until it is turning at 5.00 rev/s. Calculate the angular acceleration of the tub during this time.

1

1.16 rad/s2

2

3.64 rad/s2

3

0.64 rad/s2

9

Force and Angular Velocity

  • Recall, Τ=Frsinθ

  • If min or max, then sin Θ= 90

10

Multiple Choice

A bolt is to be tightened with a torque of 8.0 N∙m. If you have a wrench that is 0.35 m long, what is the least amount of force you must exert?

1

0.23 N

2

23 N

3

4.4 N

11

Multiple Choice

Question image

What is the torque on a bolt produced by a 15-N force exerted perpendicular to a wrench that is 25 cm long, as shown

1

375

2

60

3

3.8

12

Balanced Forces Review

  • Recall Τ=Frsinθ

  • So, if balanced T1=T2

  • or Fr1=Fr2

13

Multiple Choice

Chloe, whose mass is 56 kg, sits 1.2 m from the center of a seesaw. Josh, whose mass is 84 kg, wants to balance Chloe. Where on the seesaw should Josh sit?

1

0.8

2

1.8

3

0.65

14

Multiple Choice

Quanda has a mass of 50.0 kg and sits 2.25 m from the center of a seesaw. Jabari balances by sitting 3.55 m from Quanda. What is Jabari’s mass?

1

31

2

26.6

3

86.5

4

112.5

Chap 8 Review

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