Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 762 · 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) only on Mondays (d) no, work stays the same
2. 2.💪 A box weighs 80 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.🏋️ A force of 290 N did 2610 J of work. How many metres did the object move?
4. 4.True or false: hitting a cricket ball is a pull. (a) False (b) True
5. 5.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
6. 6.Which of these is caused by gravity? (a) rubbing hands warms them (b) lifting a school bag (c) a thrown ball comes down (d) a rolling ball slows
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
9. 9.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
10. 10.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) friction (c) magnetic force (d) gravity
11. 11.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.True or false: pulling a cart is a pull. (a) False (b) True
13. 13.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a box pushed on carpet (d) powder on a carrom board
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
18. 18.🪝 What does a single fixed pulley change? (a) the direction of pull (b) gravity (c) the colour of rope (d) the size of the load
19. 19.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
20. 20.⚖️ A lever bar balances. The load is 140 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.⚖️ A lever bar balances. The load is 70 N at 30 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
23. 23.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) gravity (c) friction (d) muscular force
24. 24.Which of these is a wedge? (a) a chisel (b) a truck loading ramp (c) a claw hammer on a nail (d) a steering wheel
25. 25.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
31. 31.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
32. 32.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
33. 33.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
34. 34.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
35. 35.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
37. 37.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
38. 38.True or false: a flagpole rope wheel is a wedge. (a) False (b) True
39. 39.🪝 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)
40. 40.True or false: a road up a hill is a lever. (a) True (b) False

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