Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 495 · 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.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
2. 2.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
7. 7.🏋️ Pushing a crate 5 m took 400 J of work. What force was used, in newtons?
8. 8.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
9. 9.Which of these is a screw? (a) a window blind cord (b) a nut and bolt (c) a flagpole rope wheel (d) a steering wheel
10. 10.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 300 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.Which of these is an inclined plane? (a) a bottle opener (b) a well winch handle (c) a door stopper (d) a truck loading ramp
12. 12.🏋️ A force of 200 N did 400 J of work. How many metres did the object move?
13. 13.Which of these is a lever? (a) a seesaw (b) a well-bucket rope wheel (c) a wheelchair ramp (d) the tip of a nail
14. 14.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
16. 16.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
17. 17.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
18. 18.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) gravity (c) friction (d) muscular force
19. 19.🏋️ Pushing a crate 7 m took 840 J of work. What force was used, in newtons?
20. 20.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
21. 21.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a round doorknob (d) a nut and bolt
23. 23.⚖️ A seesaw balances. Asha (560 N) sits ? m from the pivot on one side; Ravi (280 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
24. 24.True or false: a bottle opener is a screw. (a) False (b) True
25. 25.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
26. 26.⚖️ A lever bar balances. The load is 200 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚙️ Which simple machine is a crowbar? (a) lever (b) wheel and axle (c) inclined plane (d) pulley
28. 28.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
29. 29.True or false: a fixed pulley only changes direction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
33. 33.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
34. 34.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
35. 35.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
36. 36.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
37. 37.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) change its colour (d) stop it moving
38. 38.⚖️ A lever bar balances. The load is 250 N at ? cm from the fulcrum. The effort is 250 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
40. 40.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction

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