Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 912 · 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 seesaw balances. Meena (300 N) sits ? m from the pivot on one side; Ravi (100 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
2. 2.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
3. 3.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
4. 4.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) magnetic force (d) friction
5. 5.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.💪 A bag has a mass of 14 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 80 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
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 3 (b) class 1 (c) class 2
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
11. 11.Which of these is caused by gravity? (a) a rolling ball slows (b) a compass needle turns (c) a magnet picks up pins (d) rain falls to the ground
12. 12.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.True or false: pulling a cart is a push. (a) False (b) True
14. 14.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
15. 15.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
17. 17.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Zoya (440 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
18. 18.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
19. 19.💪 Two children push a box to the right, one with 60 N and the other with 60 N. What is the net (total) force on the box, in newtons?
20. 20.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
24. 24.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
26. 26.⚖️ A seesaw balances. Arjun (540 N) sits ? m from the pivot on one side; Meena (360 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
27. 27.🏋️ A force of 460 N did 1840 J of work. How many metres did the object move?
28. 28.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (440 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
31. 31.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
32. 32.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
33. 33.🏋️ A force of 330 N pushes a cart 2 m along the floor. How much work is done, in joules?
34. 34.💪 Which force is at work: a river flows downhill? (a) muscular force (b) magnetic force (c) gravity (d) friction
35. 35.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
36. 36.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) muscular force (d) gravity
37. 37.True or false: a window blind cord is a pulley. (a) True (b) False
38. 38.⚖️ A seesaw balances. Meena (380 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
40. 40.Which of these is a pulley? (a) a nut and bolt (b) a window blind cord (c) a wheelchair ramp (d) a chisel

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