Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 816 · 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 40 cm from the fulcrum. The effort is 280 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
3. 3.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
5. 5.True or false: pushing a trolley is a push. (a) True (b) False
6. 6.True or false: a movable pulley halves the effort. (a) False (b) True
7. 7.🏋️ A force of 230 N pushes a cart 9 m along the floor. How much work is done, in joules?
8. 8.⚖️ A seesaw balances. Ravi (? 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?
9. 9.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
10. 10.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
11. 11.⚙️ Which simple machine is a chisel? (a) pulley (b) wheel and axle (c) lever (d) wedge
12. 12.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.🏋️ 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?
14. 14.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
15. 15.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) on the rock (d) near the fulcrum
16. 16.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
17. 17.⚙️ Which simple machine is an axe blade? (a) wheel and axle (b) lever (c) wedge (d) screw
18. 18.True or false: a rough doormat gives more friction. (a) True (b) False
19. 19.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.🏋️ Pushing a crate 5 m took 1700 J of work. What force was used, in newtons?
23. 23.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
24. 24.🏋️ Pushing a crate 2 m took 60 J of work. What force was used, in newtons?
25. 25.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the effort (d) the fulcrum
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
27. 27.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a thrown ball comes down (c) a compass needle turns (d) rubbing hands warms them
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
30. 30.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 400 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
34. 34.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
37. 37.True or false: a knife edge is a screw. (a) True (b) False
38. 38.⚙️ Which simple machine is the tip of a nail? (a) wheel and axle (b) lever (c) inclined plane (d) wedge
39. 39.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
40. 40.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

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