Energy Skill Builder Worksheet

Energy Skill Builder

Adult Education Physics Energy Skill Builder Medium 15 Questions 11 Views

Classroom Worksheet

Energy Skill Builder Worksheet

Energy Skill Builder

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Grade: Adult Education

Subject: Physics

Topic: Energy

Time: 20 Minutes

Difficulty: Medium

Questions: 15

Instructions:
Read each question carefully and show your work where needed. Use clear physics reasoning and include units in your answers. Questions increase in difficulty.

Skills Practiced:

Energy
Physics
Critical Thinking
Problem Solving

1Question

Define energy in your own words.

2Question

Name two common forms of energy.

3Question

Which type of energy does a moving bicycle have?

4Question

Which type of energy is stored in a stretched rubber band?

5Question

Calculate the kinetic energy of a 2 kg object moving at 3 m/s. Use KE = 1/2 mv^2.

6Question

A 5 kg object is lifted 2 m. Calculate its gravitational potential energy. Use GPE = mgh and g = 9.8 m/s².

7Question

A device uses 100 J of energy in 20 s. Calculate its power.

8Question

State the law of conservation of energy.

9Question

A kettle changes electrical energy into thermal energy. What is the energy transformation?

10Question

A 10 kg cart has 200 J of kinetic energy. Calculate its speed. Use KE = 1/2 mv^2.

11Question

A 1.5 kg book is on a shelf 4 m high. Calculate its gravitational potential energy.

12Question

A machine does 600 J of work in 15 s. What is its power output?

13Question

Explain why a ball rolling on the floor eventually stops if no extra energy is added.

14Question

A 3 kg object is dropped from a height of 10 m. Ignoring air resistance, what speed will it have just before hitting the ground? Use conservation of energy and g = 9.8 m/s².

15Question

A person lifts a 20 kg box onto a 1.5 m high shelf in 4 s. Calculate: (a) the gain in gravitational potential energy, and (b) the average power used.

Answer Key

#	Answer
1	Energy is the ability to do work or cause change.
2	Any two of the following: kinetic, potential, thermal, chemical, electrical, light, sound, nuclear.
3	Kinetic energy.
4	Elastic potential energy.
5	KE = 1/2 × 2 × 3^2 = 9 J.
6	GPE = 5 × 9.8 × 2 = 98 J.
7	Power = Energy ÷ time = 100 ÷ 20 = 5 W.
8	Energy cannot be created or destroyed; it can only be transferred or transformed.
9	Electrical energy is transformed into thermal energy.
10	200 = 1/2 × 10 × v^2, so 200 = 5v^2, v^2 = 40, v ≈ 6.3 m/s.
11	GPE = 1.5 × 9.8 × 4 = 58.8 J, about 59 J.
12	Power = 600 ÷ 15 = 40 W.
13	Friction and air resistance transfer the ball’s kinetic energy into thermal energy and sound, so the ball loses motion energy and slows down.
14	mgh = 1/2 mv^2, so gh = 1/2 v^2. v = sqrt(2gh) = sqrt(2 × 9.8 × 10) = sqrt(196) = 14 m/s.
15	(a) GPE = 20 × 9.8 × 1.5 = 294 J. (b) Power = 294 ÷ 4 = 73.5 W, about 74 W.