A crowbar is an example of a lever and the fixed point about which a lever turns is the fulcrum, so this Year 7 sheet opens by naming the machine and its pivot. An inclined plane, a pulley and a wedge all appear in the answers.
Key Takeaways
A crowbar is a lever (Q1).
The fixed point of a lever is the fulcrum (Q2).
Q3 records an inclined plane among the answers.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.A crowbar is an example of which simple machine?
(a) pulley(b) lever(c) screw(d) wedge
2.What is the fixed point about which a lever turns called?
(a) fulcrum(b) load arm(c) effort arm(d) axle
3.A ramp is an example of an...
(a) inclined plane(b) lever(c) pulley(d) wedge
4.Which simple machine consists of a rope passing over a grooved wheel?
(a) screw(b) lever(c) pulley(d) wedge
5.The main purpose of a simple machine is to...
(a) create energy from nothing(b) allow a smaller effort to move a larger load(c) destroy unwanted energy(d) work without any energy input
6.A knife blade is an example of a...
(a) wedge(b) lever(c) pulley(d) screw
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.Define a simple machine.
8.A lever has three parts: the load, the effort and the... Complete the sentence.
9.What is a fulcrum?
10.Give one everyday example of a pulley and explain its use.
11.Explain why an inclined plane makes it easier to move a heavy load up a height.
12.State the formula used to calculate mechanical advantage.
13.In a lever, what is the difference between the load and the effort?
14.A screw is based on which other simple machine? Explain briefly.
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A lever lifts a load of 100 N using an effort of 25 N. Use mechanical advantage = load ÷ effort to calculate the mechanical advantage.
16.A pulley system raises a load of 600 N with an effort of 150 N. Calculate the mechanical advantage.
17.A ramp is 6 m long and rises a vertical height of 2 m. Use mechanical advantage = ramp length ÷ height to calculate the mechanical advantage.
18.A wheelbarrow lifts a load of 500 N with an effort of 100 N. Calculate its mechanical advantage.
19.The mechanical advantage of a machine is 3. Use effort = load ÷ mechanical advantage to calculate the effort needed to lift a load of 90 N.
20.A lever has a mechanical advantage of 5. Use load = mechanical advantage × effort to calculate the largest load it can lift when an effort of 200 N is applied.
Answer Key
1. b) lever
2. a) fulcrum
3. a) inclined plane
4. c) pulley
5. b) allow a smaller effort to move a larger load
6. a) wedge
7. Refer to solution guide.
8. Refer to solution guide.
9. Refer to solution guide.
10. Refer to solution guide.
11. Refer to solution guide.
12. Refer to solution guide.
13. Refer to solution guide.
14. Refer to solution guide.
15. Refer to solution guide.
16. Refer to solution guide.
17. Refer to solution guide.
18. Refer to solution guide.
19. Refer to solution guide.
20. Refer to solution guide.
End of Worksheet
People Also Ask
What simple machine is a crowbar?
A lever, option (b) in this worksheet (Q1).
What is the fixed point about which a lever turns?
The fulcrum, option (a) in this worksheet (Q2).
What does a lever allow?
A smaller effort to move a larger load, option (b) in this worksheet (Q5).
Stuck on a similar problem? Clear your next doubt instantly with the Doubt Solver.
Browse more free worksheets for IGCSE Year 7.