Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 331 · 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.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
2. 2.True or false: a flagpole rope wheel is a lever. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
4. 4.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) make new energy (d) stop all friction
5. 5.True or false: pulling a cart is a pull. (a) True (b) False
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) a wood screw (b) a screw jack (c) a nut and bolt (d) a playground slide
8. 8.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 660 N bucket on the axle, in newtons? (ideal)
9. 9.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) magnetic force (d) gravity
10. 10.True or false: opening a drawer is a pull. (a) False (b) True
11. 11.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
12. 12.🏋️ A force of 20 N pushes a cart 8 m along the floor. How much work is done, in joules?
13. 13.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) friction (c) magnetic force (d) gravity
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
15. 15.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
17. 17.⚖️ A seesaw balances. Ravi (140 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
21. 21.💪 A box weighs 510 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
22. 22.True or false: a claw hammer on a nail is a pulley. (a) False (b) True
23. 23.True or false: opening a drawer is a push. (a) True (b) False
24. 24.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
26. 26.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
27. 27.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
28. 28.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
29. 29.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
30. 30.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Asha (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) litre (L) (d) metre (m)
32. 32.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
35. 35.Which of these is a wedge? (a) a round doorknob (b) a window blind cord (c) a door stopper (d) a crane hook block
36. 36.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
38. 38.True or false: powder on a carrom board gives more friction. (a) True (b) False
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort

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