Grade 11 STEM Worksheet: Energy Assessment Prep

Energy Assessment Prep

Grade 11 STEM Energy Assessment Prep Advanced 30 Questions 11 Views

Classroom Worksheet

Grade 11 STEM Worksheet: Energy Assessment Prep

Energy Assessment Prep

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Grade: Grade 11

Subject: STEM

Topic: Energy

Time: 20 Minutes

Difficulty: Advanced

Questions: 30

Instructions:
Read each question carefully and answer in complete sentences when needed. Show your work for calculation problems. Questions increase in difficulty. This worksheet is designed to help you prepare for an energy assessment.

Skills Practiced:

Energy
STEM
Critical Thinking
Problem Solving

1Question

Define energy in your own words.

2Question

What is the SI unit of energy?

3Question

Name two common forms of energy.

4Question

State the law of conservation of energy.

5Question

What type of energy does a moving car have?

6Question

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

7Question

A 2 kg object moves at 3 m/s. Calculate its kinetic energy.

8Question

An object has a mass of 5 kg and is lifted to a height of 4 m. Using g = 9.8 m/s², calculate its gravitational potential energy.

9Question

Why is thermal energy considered a form of internal energy?

10Question

What happens to the kinetic energy of an object if its speed doubles?

11Question

A 10 kg object is moving at 2 m/s. What is its kinetic energy?

12Question

A student rubs their hands together and they become warm. What energy transformation is occurring?

13Question

A lamp uses 60 J of electrical energy and gives off 45 J of light energy. How much energy is converted into other forms, mostly thermal energy?

14Question

Explain why no real machine is 100% efficient.

15Question

A machine has an input energy of 500 J and an output useful energy of 350 J. What is its efficiency?

16Question

A battery supplies 120 J of energy to a circuit. The circuit uses 90 J usefully. What is the wasted energy?

17Question

A 4 kg object is lifted from the ground to a shelf 2.5 m high. Calculate its gravitational potential energy.

18Question

A roller coaster starts at the top of a hill with high gravitational potential energy. As it moves downward, what happens to its energy?

19Question

A 1.5 kg object has 30 J of kinetic energy. Calculate its speed.

20Question

A force of 20 N moves an object 3 m in the same direction as the force. How much work is done?

21Question

A student carries a backpack horizontally across a level floor at constant speed. According to the physics definition of work, is work done on the backpack by the lifting force? Explain briefly.

22Question

A 2,000 W heater runs for 15 minutes. Calculate the electrical energy it uses in joules.

23Question

Convert 1,800,000 J to kilojoules.

24Question

A solar panel receives 800 J of sunlight and produces 160 J of electrical energy. What is its efficiency?

25Question

A 6 kg object is dropped from a height of 10 m. Ignoring air resistance, what is its gravitational potential energy before it falls?

26Question

Using the previous question, what is the object's kinetic energy just before it hits the ground, ignoring air resistance?

27Question

A pendulum swings from its highest point to its lowest point. Describe the energy changes during this motion.

28Question

A car engine transfers 2.4 × 10^5 J of chemical energy from fuel into 7.2 × 10^4 J of useful kinetic energy. Calculate the efficiency.

29Question

Explain why increasing friction in a machine usually lowers its efficiency.

30Question

A 3 kg ball is thrown upward at 12 m/s. Ignoring air resistance, calculate its initial kinetic energy and the maximum height it can reach. Use g = 9.8 m/s².

Answer Key

#	Answer
1	Energy is the ability to do work or cause change.
2	The joule (J).
3	Any two of the following: kinetic, potential, thermal, chemical, electrical, nuclear, radiant, sound.
4	Energy cannot be created or destroyed; it can only be transferred or transformed from one form to another.
5	Kinetic energy.
6	Elastic potential energy.
7	KE = 1/2 mv^2 = 1/2(2)(3^2) = 9 J.
8	GPE = mgh = 5 × 9.8 × 4 = 196 J.
9	Because it comes from the motion and interactions of particles within a substance.
10	Its kinetic energy increases by a factor of four.
11	KE = 1/2(10)(2^2) = 20 J.
12	Mechanical energy is transformed into thermal energy.
13	15 J.
14	Some energy is always transformed into less useful forms, especially thermal energy and sound, due to friction and other losses.
15	Efficiency = (350/500) × 100% = 70%.
16	30 J.
17	GPE = 4 × 9.8 × 2.5 = 98 J.
18	Gravitational potential energy decreases and kinetic energy increases.
19	KE = 1/2 mv^2, so 30 = 0.75v^2, v^2 = 40, v ≈ 6.3 m/s.
20	Work = force × distance = 20 × 3 = 60 J.
21	No. The lifting force is vertical while the displacement is horizontal, so the force is perpendicular to the motion and does no work on the backpack.
22	Time = 900 s. Energy = power × time = 2000 × 900 = 1,800,000 J.
23	1800 kJ.
24	Efficiency = (160/800) × 100% = 20%.
25	GPE = 6 × 9.8 × 10 = 588 J.
26	588 J.
27	At the top it has maximum gravitational potential energy. As it falls, GPE is converted into kinetic energy. At the bottom, kinetic energy is greatest.
28	Efficiency = (7.2 × 10^4 / 2.4 × 10^5) × 100% = 30%.
29	Friction converts more input energy into thermal energy, leaving less energy for the machine's useful output.
30	Initial KE = 1/2(3)(12^2) = 216 J. At maximum height, KE becomes GPE: mgh = 216, so h = 216/(3×9.8) ≈ 7.35 m.