Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 738 · 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 120 N did 240 J of work. How many metres did the object move?
2. 2.🏋️ A force of 320 N did 3200 J of work. How many metres did the object move?
3. 3.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) muscular force (c) gravity (d) friction
4. 4.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
5. 5.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a round doorknob (c) a crane hook block (d) a window blind cord
6. 6.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
7. 7.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
8. 8.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a wood screw (d) a crowbar
9. 9.💪 Which force is at work: a thrown ball comes down? (a) friction (b) muscular force (c) magnetic force (d) gravity
10. 10.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.True or false: plucking a mango is a push. (a) True (b) False
13. 13.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) friction (c) gravity (d) magnetic force
14. 14.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
15. 15.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
16. 16.True or false: opening a drawer is a pull. (a) False (b) True
17. 17.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Ravi (520 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚙️ Which simple machine is a door stopper? (a) lever (b) screw (c) wedge (d) wheel and axle
19. 19.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
20. 20.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
21. 21.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
22. 22.Which of these is caused by muscular force? (a) a thrown ball comes down (b) squeezing a lemon (c) a compass needle turns (d) brakes stop a bicycle
23. 23.⚖️ A lever bar balances. The load is 320 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ A seesaw balances. Meena (420 N) sits 3 m from the pivot on one side; Kabir (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
28. 28.⚖️ A lever bar balances. The load is 720 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🔍 Which is the odd one out? (a) a bottle opener (b) a crowbar (c) a seesaw (d) a road up a hill
30. 30.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
31. 31.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
32. 32.💪 A cart is pulled to the right with 100 N and to the left with 110 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
33. 33.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
34. 34.True or false: skating on ice gives less friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
37. 37.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
38. 38.💪 Which force is at work: a river flows downhill? (a) muscular force (b) friction (c) magnetic force (d) gravity
39. 39.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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