Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 155 · 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 pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
2. 2.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.⚖️ A seesaw balances. Kabir (200 N) sits 1 m from the pivot on one side; Zoya (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ A lever bar balances. The load is 200 N at 40 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?
6. 6.⚖️ A seesaw balances. Meena (340 N) sits 3 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?
7. 7.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
8. 8.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 90 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
10. 10.🪝 A pulley system lifts a 1160 N load with an effort of 290 N. What is its mechanical advantage (MA)?
11. 11.Which of these is caused by muscular force? (a) shoes grip the floor (b) rubbing hands warms them (c) a magnet picks up pins (d) lifting a school bag
12. 12.True or false: a beam balance is a class 2 lever (load in the middle). (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.True or false: closing a drawer is a push. (a) False (b) True
15. 15.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
16. 16.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
17. 17.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a grippy rubber sole (d) a rough doormat
18. 18.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
19. 19.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
20. 20.True or false: pulling a cart is a pull. (a) False (b) True
21. 21.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
22. 22.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) wedge (c) screw (d) inclined plane
24. 24.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
25. 25.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
26. 26.💪 A bag has a mass of 42 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.💪 A box weighs 470 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
28. 28.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🏋️ A force of 200 N pushes a cart 5 m along the floor. How much work is done, in joules?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 100 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
33. 33.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🔍 Which is the odd one out? (a) a road up a hill (b) a water tap handle (c) a truck loading ramp (d) a wheelchair ramp
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
40. 40.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False

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