Grade 9 Robotics Worksheet: Energy Skill Builder

Energy Skill Builder

Grade 9 Robotics Energy Skill Builder Advanced 25 Questions 7 Views

Classroom Worksheet

Grade 9 Robotics Worksheet: Energy Skill Builder

Energy Skill Builder

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Grade: Grade 9

Subject: Robotics

Topic: Energy

Time: 20 Minutes

Difficulty: Advanced

Questions: 25

Instructions:
Read each question carefully and show your thinking when solving. This worksheet focuses on how energy is stored, transferred, used, and wasted in robotics systems. Questions increase in difficulty from basic recall to advanced application and analysis.

Skills Practiced:

Energy
Robotics
Critical Thinking
Problem Solving

1Question

What is energy in a robotics system?

2Question

Name one common energy source used in mobile robots.

3Question

What type of energy does a charged battery store?

4Question

What form of energy is used when a robot motor turns a wheel?

5Question

What is the main purpose of a battery in a robot?

6Question

Which component usually converts electrical energy into motion in a robot?

7Question

Why do robots need energy-efficient designs?

8Question

Identify one example of energy transfer in a robot.

9Question

What is meant by energy loss in robotics?

10Question

Why does a robot motor often become warm during use?

11Question

A robot moves more slowly when its battery is low. What is one likely reason?

12Question

Explain the difference between power and energy in a robotics context.

13Question

A robot uses 20 watts for 5 seconds. How much energy does it use?

14Question

If a robot has a 12 V battery and draws 2 A of current, what is its electrical power use?

15Question

Why might a robot with heavier wheels need more energy to move?

16Question

What is one way friction affects a robot’s energy use?

17Question

A robot must move a box from one place to another. Which uses more energy: moving the empty robot or the robot carrying the box? Explain briefly.

18Question

What is regenerative braking in some robots or vehicles?

19Question

Why is regenerative braking useful in battery-powered robots?

20Question

A robot operates for 30 minutes using a 6 V, 3 Ah battery. What is the battery’s total stored energy in watt-hours?

21Question

A motor is 80% efficient. If it receives 50 J of electrical energy, how much becomes useful mechanical energy?

22Question

Why is it important to match the robot’s power supply to the motor’s voltage rating?

23Question

A robot must run for a long time with limited battery capacity. Name two design choices that could improve its energy efficiency.

24Question

Compare a robot that moves with smooth wheels on a flat floor to one that moves on rough carpet. Which one usually uses more energy, and why?

25Question

A team wants to design a search-and-rescue robot that can travel far, carry sensors, and avoid wasting energy. Describe three energy-focused design strategies they should consider.

Answer Key

#	Answer
1	Energy is the ability to do work or cause change in a robot, such as moving motors, lighting sensors, or powering a controller.
2	A battery.
3	Chemical energy.
4	Mechanical energy.
5	To supply electrical energy to the robot’s components.
6	The motor.
7	To make better use of battery power, reduce heat loss, and allow the robot to work longer.
8	Electrical energy from the battery is transferred to a motor, which becomes mechanical motion.
9	Energy that is not used for the intended task and is converted into unwanted forms such as heat or sound.
10	Because some electrical energy is converted into heat due to resistance and friction.
11	The battery is supplying less voltage or current, so the motor receives less power.
12	Energy is the total amount of work available or used, while power is how quickly energy is used or transferred.
13	100 joules, because energy = power × time = 20 W × 5 s.
14	24 watts, because power = voltage × current = 12 V × 2 A.
15	Heavier wheels increase mass and rotational inertia, so more energy is needed to start and keep them moving.
16	Friction converts some of the robot’s mechanical energy into heat, so more energy is needed to keep moving.
17	The robot carrying the box uses more energy because the added load increases mass and requires more force to move.
18	A system that converts some kinetic energy back into electrical energy during slowing down or braking.
19	It can recover some energy that would otherwise be lost as heat and extend battery life.
20	18 Wh, because energy = voltage × capacity = 6 V × 3 Ah = 18 Wh.
21	40 J, because 80% of 50 J = 40 J.
22	To prevent damage, overheating, poor performance, or insufficient power delivery.
23	Use lightweight materials and efficient motors; other valid answers include reducing friction, lowering speed when possible, or using low-power electronics.
24	The robot on rough carpet usually uses more energy because friction and rolling resistance are greater.
25	Possible strategies include using efficient motors, reducing weight, choosing low-friction wheels or tracks, optimizing software to avoid unnecessary movement, and using a battery with enough capacity for the mission.