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Assignment Redo: Calculating Work, Power, and Efficency

Authored by Rune Breckon

Science

8th Grade

NGSS covered

Used 4+ times

Assignment Redo: Calculating Work, Power, and Efficency
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A motor does 200 J of work in 10 seconds. What is the power output of the motor?

The formula for power is Power (W) = Work (J) / Time (s).

10 W

20 W

30 W

40 W

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The formula for power is Power (W) = Work (J) / Time (s).

A light bulb uses 60 J of energy in 2 seconds. What is the power of the light bulb?

15 W

20 W

25 W

30 W

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A crane lifts a 500 J load in 25 seconds. What is the power of the crane?

The formula for power is Power (W) = Work (J) / Time (s).

25 W

20 W

15 W

10 W

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The formula for power is Power (W) = Work (J) / Time (s).

A student does 150 J of work in 5 seconds. What is the power output of the student?

25 W

35 W

30 W

20 W

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A machine performs 300 J of work in 15 seconds. What is the power of the machine?

The formula for power is Power (W) = Work (J) / Time (s).

25 W

15 W

30 W

20 W

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The work input of a screwdriver is 100 J. The work output of the screwdriver is 80 J.

What is the efficiency of the screwdriver?

The formulas for Efficiency are (Work Output / Work Input) x 100 and

(Mechanical Advantage / Speed Ratio) x 100.

70%

75%

80%

85%

Tags

NGSS.MS-PS3-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The formulas for Efficiency are (Work Output / Work Input) x 100 and

(Mechanical Advantage / Speed Ratio) x 100.

A cyclist sprinter does 1,000 J of work in a race.

While their bike does 600 J of work during the race. What is the efficiency of the bike?

60%

65%

50%

55%

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