Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 797 · 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.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
2. 2.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) second (s) (d) newton (N)
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
4. 4.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 770 N bucket on the axle, in newtons? (ideal)
5. 5.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
6. 6.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
9. 9.True or false: pulling a cart is a pull. (a) True (b) False
10. 10.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
11. 11.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.True or false: a grippy rubber sole gives less friction. (a) False (b) True
13. 13.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) friction (c) magnetic force (d) muscular force
14. 14.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) oil on a squeaky hinge (d) a grippy rubber sole
16. 16.True or false: a well-bucket rope wheel is a pulley. (a) False (b) True
17. 17.⚖️ A lever bar balances. The load is 50 N at ? cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
20. 20.Which of these is caused by friction? (a) rain falls to the ground (b) shoes grip the floor (c) a thrown ball comes down (d) a compass needle turns
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.True or false: a movable pulley only changes direction. (a) True (b) False
24. 24.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
25. 25.⚖️ A seesaw balances. Arjun (680 N) sits 3 m from the pivot on one side; Meena (510 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.True or false: a window blind cord is a lever. (a) True (b) False
27. 27.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
28. 28.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) wind (d) friction
29. 29.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crane hook block (c) a bottle opener (d) a nutcracker
30. 30.💪 A box weighs 410 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
32. 32.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
33. 33.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the pulley
34. 34.⚖️ A seesaw balances. Meena (480 N) sits 4 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
36. 36.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
37. 37.⚖️ A seesaw balances. Kabir (170 N) sits 1 m from the pivot on one side; Zoya (170 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
39. 39.🏋️ Pushing a crate 2 m took 360 J of work. What force was used, in newtons?
40. 40.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly

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