Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 438 · 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.True or false: a round doorknob is a lever. (a) True (b) False
2. 2.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
3. 3.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) gravity (c) magnetic force (d) friction
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
5. 5.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
6. 6.⚖️ A seesaw balances. Zoya (760 N) sits 1 m from the pivot on one side; Ravi (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
7. 7.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the pulley
8. 8.⚖️ A seesaw balances. Zoya (120 N) sits 3 m from the pivot on one side; Kabir (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.Which of these is caused by muscular force? (a) shoes grip the floor (b) rain falls to the ground (c) a rolling ball slows (d) squeezing a lemon
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
11. 11.⚖️ A seesaw balances. Arjun (180 N) sits ? m from the pivot on one side; Ravi (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) gravity (d) friction
13. 13.Which of these is a wedge? (a) a seesaw (b) a door stopper (c) a playground slide (d) a claw hammer on a nail
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
15. 15.True or false: a fixed pulley stays in one place. (a) True (b) False
16. 16.⚖️ A lever bar balances. The load is 400 N at 40 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.True or false: a smooth steel slide gives more friction. (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.Which of these is a lever? (a) a wood screw (b) a bottle opener (c) a screw jack (d) a window blind cord
20. 20.💪 In a tug of war, one team pulls right with 45 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
21. 21.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
22. 22.💪 A bag has a mass of 31 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
24. 24.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
25. 25.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
26. 26.Which of these is a lever? (a) a chisel (b) a crane hook block (c) a nutcracker (d) a well winch handle
27. 27.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
28. 28.💪 A cart is pulled to the right with 35 N and to the left with 45 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
30. 30.⚖️ A seesaw balances. Zoya (400 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) a rope on a wheel (d) two ramps back to back
32. 32.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
33. 33.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
34. 34.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 140 N bucket on the axle, in newtons? (ideal)
35. 35.True or false: a movable pulley needs effort = load. (a) False (b) True
36. 36.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
38. 38.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) a smooth steel slide
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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