Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 508 · 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 machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.🏋️ Pushing a crate 5 m took 900 J of work. What force was used, in newtons?
4. 4.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the fulcrum (c) the effort (d) the load
5. 5.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
6. 6.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚙️ Which simple machine is a road up a hill? (a) screw (b) wheel and axle (c) wedge (d) inclined plane
8. 8.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
10. 10.True or false: plucking a mango is a push. (a) True (b) False
11. 11.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a ramp wrapped round (d) a bent lever
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
13. 13.⚖️ A lever bar balances. The load is 270 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.True or false: a fixed pulley stays in one place. (a) True (b) False
16. 16.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
17. 17.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
18. 18.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
19. 19.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
20. 20.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
21. 21.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) oil on a squeaky hinge
23. 23.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1330 N bucket on the axle, in newtons? (ideal)
25. 25.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 60 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) near the fulcrum (d) far from the fulcrum
28. 28.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ A seesaw balances. Ravi (440 N) sits 3 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
32. 32.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a grippy rubber sole (d) a wheel on ball bearings
36. 36.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) lever (c) screw (d) inclined plane
37. 37.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
38. 38.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
40. 40.🏋️ A force of 80 N did 560 J of work. How many metres did the object move?

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