Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 352 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ A lever bar balances. The load is 480 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the axle
4. 4.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
5. 5.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
6. 6.⚙️ Which simple machine is an axe blade? (a) screw (b) pulley (c) wedge (d) lever
7. 7.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
8. 8.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
9. 9.⚙️ Which simple machine is a screw jack? (a) screw (b) inclined plane (c) wedge (d) wheel and axle
10. 10.True or false: a road up a hill is a wheel and axle. (a) True (b) False
11. 11.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
12. 12.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Asha (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🔍 Which is the odd one out? (a) a playground slide (b) a road up a hill (c) a wheelchair ramp (d) a crowbar
14. 14.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
15. 15.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
16. 16.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) change its shape (d) stop it moving
17. 17.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) skating on ice (d) a tyre with deep treads
20. 20.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wheel and axle (c) lever (d) wedge
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
24. 24.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort
25. 25.🏋️ Pushing a crate 2 m took 80 J of work. What force was used, in newtons?
26. 26.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
29. 29.True or false: a movable pulley is on a flagpole top. (a) False (b) True
30. 30.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
31. 31.🏋️ Pushing a crate 6 m took 2700 J of work. What force was used, in newtons?
32. 32.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🏋️ A force of 350 N did 3500 J of work. How many metres did the object move?
34. 34.True or false: a movable pulley stays in one place. (a) False (b) True
35. 35.💪 Which force is at work: lifting a school bag? (a) friction (b) muscular force (c) gravity (d) magnetic force
36. 36.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
37. 37.💪 A box weighs 30 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
38. 38.True or false: a chisel is a lever. (a) False (b) True
39. 39.🏋️ A force of 410 N did 1230 J of work. How many metres did the object move?
40. 40.🏋️ A force of 260 N pushes a cart 5 m along the floor. How much work is done, in joules?

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