Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 40 · 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.Which of these is caused by magnetic force? (a) squeezing a lemon (b) an apple falls down (c) a thrown ball comes down (d) a fridge magnet sticks
2. 2.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
3. 3.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.⚙️ Which simple machine is a screw jack? (a) wedge (b) pulley (c) wheel and axle (d) screw
5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
6. 6.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
7. 7.🏋️ Pushing a crate 9 m took 90 J of work. What force was used, in newtons?
8. 8.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
9. 9.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
10. 10.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 950 N bucket on the axle, in newtons? (ideal)
11. 11.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
12. 12.⚖️ A lever bar balances. The load is 480 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.True or false: a crane hook block is a wheel and axle. (a) False (b) True
14. 14.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) far from the fulcrum (d) near the fulcrum
15. 15.True or false: a movable pulley rises with the load. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a round doorknob (b) a wheelchair ramp (c) a truck loading ramp (d) a road up a hill
17. 17.True or false: a tug of war is a pull. (a) False (b) True
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.⚖️ A lever bar balances. The load is 50 N at ? cm from the fulcrum. The effort is 30 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.Which of these is a wedge? (a) a nutcracker (b) an axe blade (c) a well-bucket rope wheel (d) a wheelchair ramp
22. 22.True or false: a bottle opener is a wheel and axle. (a) False (b) True
23. 23.Which of these is caused by friction? (a) a river flows downhill (b) a compass needle turns (c) squeezing a lemon (d) a rolling ball slows
24. 24.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) time taken (d) mass of fulcrum
25. 25.⚙️ Which simple machine is a playground slide? (a) pulley (b) screw (c) lever (d) inclined plane
26. 26.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
27. 27.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
28. 28.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
29. 29.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
30. 30.True or false: sand on a slippery path gives less friction. (a) True (b) False
31. 31.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
34. 34.⚖️ A seesaw balances. Asha (200 N) sits ? m from the pivot on one side; Ravi (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
35. 35.True or false: pulling up your socks is a push. (a) False (b) True
36. 36.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
37. 37.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
38. 38.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
39. 39.True or false: a door stopper is a screw. (a) True (b) False
40. 40.True or false: a wheel on ball bearings gives more friction. (a) True (b) False

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