Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 865 · 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 force of 250 N did 1750 J of work. How many metres did the object move?
2. 2.⚖️ A seesaw balances. Ravi (240 N) sits 4 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
4. 4.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
5. 5.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.True or false: a well winch handle is a lever. (a) True (b) False
7. 7.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
8. 8.True or false: pushing a trolley is a pull. (a) False (b) True
9. 9.🏋️ A force of 80 N pushes a cart 10 m along the floor. How much work is done, in joules?
10. 10.🪝 A load of 720 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
12. 12.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
13. 13.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.⚙️ Which simple machine is a crowbar? (a) screw (b) lever (c) wedge (d) inclined plane
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
16. 16.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
17. 17.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) muscular force (d) magnetic force
18. 18.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
19. 19.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Arjun (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🪝 A bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.⚖️ A lever bar balances. The load is 150 N at 10 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
24. 24.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
26. 26.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a crane hook block (d) the tip of a nail
27. 27.⚖️ A lever bar balances. The load is 160 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.True or false: a crowbar is a lever. (a) False (b) True
29. 29.Which of these is a wedge? (a) a claw hammer on a nail (b) a nutcracker (c) a wheelchair ramp (d) a chisel
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
32. 32.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
33. 33.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
34. 34.⚙️ Which simple machine is a bottle opener? (a) lever (b) pulley (c) wheel and axle (d) inclined plane
35. 35.True or false: a water tap handle is a wheel and axle. (a) False (b) True
36. 36.⚖️ A seesaw balances. Asha (520 N) sits 4 m from the pivot on one side; Arjun (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
38. 38.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (540 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ A seesaw balances. Arjun (720 N) sits 2 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts an 880 N bucket on the axle, in newtons? (ideal)

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