Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 716 · 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: a grippy rubber sole gives less friction. (a) False (b) True
2. 2.💪 Which force is at work: a rolling ball slows? (a) friction (b) magnetic force (c) gravity (d) muscular force
3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
4. 4.True or false: a door stopper is a wheel and axle. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
6. 6.Which of these is a pulley? (a) a nut and bolt (b) a crane hook block (c) a chisel (d) a jar lid
7. 7.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
8. 8.💪 Two children push a box to the right, one with 70 N and the other with 95 N. What is the net (total) force on the box, in newtons?
9. 9.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) use a smaller force (d) stop all friction
10. 10.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
11. 11.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
12. 12.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
13. 13.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.⚖️ A seesaw balances. Zoya (450 N) sits 4 m from the pivot on one side; Arjun (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
15. 15.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
16. 16.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
17. 17.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
18. 18.💪 Two children push a box to the right, one with 70 N and the other with 25 N. What is the net (total) force on the box, in newtons?
19. 19.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.💪 A box weighs 170 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
24. 24.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
25. 25.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
26. 26.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
27. 27.True or false: hitting a cricket ball is a pull. (a) False (b) True
28. 28.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) nothing
29. 29.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) gravity (d) wind
30. 30.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) False (b) True
31. 31.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
32. 32.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
33. 33.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🏋️ Pushing a crate 10 m took 2400 J of work. What force was used, in newtons?
36. 36.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
37. 37.💪 Two children push a box to the right, one with 50 N and the other with 90 N. What is the net (total) force on the box, in newtons?
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
40. 40.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?

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