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Energy Essentials Quiz

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Energy Essentials Quiz

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Energy concepts and calculations

Created by

Matangi Mathu
Matangi Mathu
India

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Energy Essentials Quiz
 

Energy Essentials QuizOnline version

Energy concepts and calculations

by Matangi Mathu
1

A 5 kg block is lifted 2 m. What is the work done against gravity? (g = 9.8 m/s^2)

2

A 3 kg mass is released from rest and falls 4 m. What is its potential energy lost (ignore air resistance)?

3

If a 2 kg object gains 20 J of kinetic energy, what is its new velocity? (initially at rest)

4

A 10 N force moves an object 3 m in the direction of the force. What is the work done?

5

Which quantity remains constant in a frictionless system when only conservative forces act?

6

Power is defined as the rate of doing work. Which unit is correct for power?

7

A 4 kg object is raised by 5 m. What is its potential energy at the top (take ground as zero)?

8

If kinetic energy doubles while mass remains the same, what happens to velocity?

9

A machine does 150 J of work in 15 s. What is its power output?

10

Two equal masses slide frictionlessly down different heights. Which mass has greater KE at bottom?

Feedback

Work done against gravity W = m g h = 5×9.8×2 = 98 J.

ΔU = m g h = 3×9.8×4 = 117.6 J.

KE = 1/2 m v^2, so v = √(2KE/m) = √(40/2) = √20 ≈ 4.47 m/s.

W = Fd cosθ, here θ=0°, so W = 10×3 = 30 J.

In the absence of non-conservative forces, total mechanical energy is conserved.

P = W/t ; unit is joule per second = watt.

U = m g h = 4×9.8×5 = 196 J.

KE ∝ v^2, so doubling KE means v × √2.

P = W/t = 150/15 = 10 W.

For equal masses, KE at bottom depends on height; m cancels in mgh = KE. If heights equal, KE equal.

 
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