Lesson T1.1.4
T1.1.4 Simple machines and work done Quiz: KS3 Physics, Unit 1
20 questions
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Lesson T1.1.4, Simple machines and work done: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 1: Energy, written with Revision Ninja.
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The 20 questions
-
How is work done calculated in physics?
- Force × distance
- Mass × acceleration
- Power × time
- Force × speed
-
What is the unit of work done or energy transferred?
- Watt (W)
- Metre per second (m/s)
- Joule (J)
- Newton (N)
-
A force of 20 N moves a box 3 m in the direction of the force. What is the work done?
- 17 J
- 23 J
- 6.7 J
- 60 J
-
A force of 50 N pushes a trolley 4 m. How much energy is transferred?
- 200 J
- 54 J
- 46 J
- 12.5 J
-
If a lever gives a bigger output force, how does its output end move?
- Zero distance
- Smaller distance
- Greater distance
- Same distance
-
What is the trade-off when using a pulley system to lift a load with less force?
- Shorter distance
- Higher speed
- Longer distance
- Greater mass
-
Why is no real machine 100% efficient?
- Electricity runs out
- Gravity stops working
- Friction wastes energy
- Too much mass
-
A machine receives 120 J of work and gives 90 J of useful output. What is its efficiency?
- 75%
- 133%
- 25%
- 30%
-
A person lifts a 5 N weight through 2 m. What is the work done?
- 3 J
- 7 J
- 10 J
- 2.5 J
-
An ideal machine has an input force of 10 N and output force of 40 N. What is the input distance compared to output?
- Four times smaller
- Ten times larger
- Four times larger
- Equal
-
Which of these is an example of a simple machine?
- A computer
- A television
- A radio
- A screwdriver
-
What does a simple wedge do to the applied force?
- Decreases the force
- Increases the force
- Eliminates friction
- Destroys energy
-
A machine receives 500 J of energy and gives out 350 J of useful energy. How much energy is wasted?
- 850 J
- 150 J
- 500 J
- 350 J
-
How does using a frictionless ramp compare to lifting an object vertically?
- Vertical lift is less
- Ramp requires zero work
- Work done is equal
- Ramp requires more work
-
A person pushes a crate with a force of 200 N across a floor for 8 m. What is the work done?
- 208 J
- 25 J
- 1200 J
- 1600 J
-
If the distance moved doubles while force stays the same, what happens to work done?
- It stays the same
- It quadruples
- It doubles
- It halves
-
A lever has an input force of 60 N moved through 1.5 m. An ideal output force of 300 N is produced. What is the output distance?
- 0.3 m
- 0.9 m
- 0.25 m
- 1.5 m
-
As a child slides down a slide, gravitational potential energy transfers to which stores?
- Chemical and elastic
- Nuclear and magnetic
- Light and sound
- Kinetic and thermal
-
What do simple machines alter while transferring a fixed amount of energy?
- Total energy amount
- Force size or direction
- Mass of the object
- Speed of light
-
When a box is pushed across a rough floor at constant speed, where does energy mostly go?
- Thermal stores
- Gravitational store
- Chemical store
- Elastic store
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