Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 879 · 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 pulley system lifts a 60 N load with an effort of 30 N. What is its mechanical advantage (MA)?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
3. 3.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) use a smaller force (d) switch off gravity
4. 4.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
5. 5.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
6. 6.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.True or false: pushing a swing is a push. (a) True (b) False
8. 8.🏋️ A force of 380 N did 380 J of work. How many metres did the object move?
9. 9.💪 A box weighs 200 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
11. 11.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
12. 12.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) rain falls to the ground (c) a rolling ball slows (d) an apple falls down
13. 13.🏋️ Pushing a crate 9 m took 1350 J of work. What force was used, in newtons?
14. 14.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) oil on a squeaky hinge (d) skating on ice
17. 17.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
19. 19.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
20. 20.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ A seesaw balances. Kabir (440 N) sits 2 m from the pivot on one side; Arjun (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
23. 23.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
24. 24.⚖️ A seesaw balances. Kabir (360 N) sits 4 m from the pivot on one side; Arjun (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ A seesaw balances. Arjun (300 N) sits 3 m from the pivot on one side; Zoya (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
28. 28.💪 Which force is at work: rubbing hands warms them? (a) friction (b) magnetic force (c) gravity (d) muscular force
29. 29.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
30. 30.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.True or false: chalk on a gym bar gives more friction. (a) False (b) True
32. 32.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.🔍 Which is the odd one out? (a) a crowbar (b) the tip of a nail (c) an axe blade (d) a knife edge
37. 37.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wet tiled floor (d) sand on a slippery path
39. 39.Which of these is caused by friction? (a) a fridge magnet sticks (b) a magnet picks up pins (c) rubbing hands warms them (d) a thrown ball comes down
40. 40.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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