Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 65 · 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.Which of these is caused by magnetic force? (a) a river flows downhill (b) a compass needle turns (c) rain falls to the ground (d) shoes grip the floor
2. 2.True or false: plucking a mango is a push. (a) True (b) False
3. 3.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
4. 4.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
6. 6.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
7. 7.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
9. 9.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) unbalanced (d) balanced
10. 10.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
11. 11.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
12. 12.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
13. 13.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
17. 17.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
18. 18.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.🏋️ Pushing a crate 8 m took 3360 J of work. What force was used, in newtons?
25. 25.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Kabir (110 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
26. 26.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
27. 27.True or false: a movable pulley only changes direction. (a) False (b) True
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.⚖️ A seesaw balances. Meena (340 N) sits 1 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ A lever bar balances. The load is 280 N at 20 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?
31. 31.True or false: powder on a carrom board gives less friction. (a) True (b) False
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
33. 33.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
34. 34.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
35. 35.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a bent lever (d) a tiny pulley
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
37. 37.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 350 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.💪 Which force is at work: a thrown ball comes down? (a) friction (b) gravity (c) muscular force (d) magnetic force
39. 39.Which of these is an inclined plane? (a) a claw hammer on a nail (b) a knife edge (c) a truck loading ramp (d) a door stopper
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) skating on ice (d) sand on a slippery path

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