Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 441 · 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.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) near the fulcrum (d) on the rock
2. 2.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.True or false: closing a drawer is a push. (a) True (b) False
4. 4.⚖️ A lever bar balances. The load is 640 N at 40 cm from the fulcrum. The effort is 320 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.💪 A box weighs 240 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.💪 A bag has a mass of 31 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
8. 8.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.Which of these is caused by magnetic force? (a) lifting a school bag (b) shoes grip the floor (c) brakes stop a bicycle (d) a magnet picks up pins
12. 12.💪 A force is a … (a) push or a pull (b) unit of time (c) kind of colour (d) type of sound
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
14. 14.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
15. 15.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
16. 16.Which of these is caused by friction? (a) an apple falls down (b) shoes grip the floor (c) squeezing a lemon (d) a river flows downhill
17. 17.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
18. 18.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
19. 19.🏋️ A force of 120 N pushes a cart 1 m along the floor. How much work is done, in joules?
20. 20.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) wheel and axle (c) pulley (d) wedge
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.Which of these is caused by muscular force? (a) pedalling a cycle (b) an apple falls down (c) a rolling ball slows (d) brakes stop a bicycle
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
26. 26.⚖️ A seesaw balances. Arjun (220 N) sits 1 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
28. 28.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
29. 29.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
30. 30.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
31. 31.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
32. 32.True or false: drawing up a well bucket is a pull. (a) False (b) True
33. 33.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
34. 34.🏋️ A force of 480 N did 4800 J of work. How many metres did the object move?
35. 35.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
36. 36.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
39. 39.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 270 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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