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Work, Power, and Energy

Authored by Lnthr Lnthr

Mathematics

8th Grade

Used 3+ times

Work, Power, and Energy
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64 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A student pushes a 20.0 kg box with 50.0 N over 4.0 m. How much work is done?

2.0x10^2 J

2.5x10^2 J

1.0x10^2 J

20 J

Answer explanation

W = F × d = 50 N × 4 m = 200 J

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

You lift a 2.0 kg book 1.5 m high. What is the gain in potential energy (g=9.8)?

2.9 x10 J

19.6 x10^2J

9.8 x10 J

39.2 J

Answer explanation

PE = mgh = 2×9.8×1.5 = 29.4 J

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 0.50 kg toy car rolls down reaching 3.00 m/s. What is its KE?

2.25 J
4.5 J
0.75 J
1.5 J

Answer explanation

KE = 1/2 mv² = 0.5×0.5×9 = 2.25 J

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A spring with F=200 N is stretched 0.005 m. How much work is done?

1 J
2 J
0.1 J
10 J

Answer explanation

W = Fd = 200×0.005 = 1 J

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 60.0 W bulb runs for 2.00 hours. How much energy is used?

4.32 x10^5 J

12.0 x10^3 J

7.20 x10^3 J

3.60 x10^3 J

Answer explanation

E = P×t = 60 W×7200 s = 432000 J

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 1.00 kg ball dropped from 2.00 m. What is its PE just before hitting?

19.6 J
9.8 J
29.4 J
0 J

Answer explanation

PE_initial = mgh = 1×9.8×2 = 19.6 J

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

You do 150.0 J of work pushing a sled up a 2.0 m incline (m=5.0 kg). What is the friction work?

52 J
98 J
150 J
0 J

Answer explanation

ΔPE=5×9.8×2=98 J; friction=150−98=52 J

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