Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 103 · 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: the tip of a nail is a lever. (a) False (b) True
2. 2.True or false: a well winch handle is a pulley. (a) True (b) False
3. 3.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
5. 5.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 300 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
7. 7.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 80 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
9. 9.⚙️ Which simple machine is a screw jack? (a) lever (b) pulley (c) screw (d) wheel and axle
10. 10.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
11. 11.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
12. 12.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) stop all friction (d) make new energy
13. 13.⚖️ A lever bar balances. The load is 60 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
15. 15.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the load (d) the effort
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
18. 18.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
19. 19.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
20. 20.True or false: powder on a carrom board gives more friction. (a) True (b) False
21. 21.🪝 A bucket weighing 380 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
23. 23.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
24. 24.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
25. 25.⚖️ 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
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
28. 28.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
29. 29.True or false: chalk on a gym bar gives more friction. (a) True (b) False
30. 30.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
31. 31.🏋️ A force of 330 N pushes a cart 5 m along the floor. How much work is done, in joules?
32. 32.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
33. 33.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
35. 35.True or false: sand on a slippery path gives more friction. (a) True (b) False
36. 36.🏋️ Pushing a crate 5 m took 850 J of work. What force was used, in newtons?
37. 37.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
38. 38.⚖️ A seesaw balances. Asha (440 N) sits ? m from the pivot on one side; Arjun (440 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
39. 39.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) stop it moving (d) change its colour
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice

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