Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 46 · 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 movable pulley is on a flagpole top. (a) True (b) False
2. 2.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Ravi (420 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
4. 4.True or false: kicking a football is a pull. (a) True (b) False
5. 5.🏋️ A force of 430 N pushes a cart 10 m along the floor. How much work is done, in joules?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
7. 7.True or false: closing a drawer is a pull. (a) False (b) True
8. 8.⚙️ Which simple machine is a bottle opener? (a) wedge (b) lever (c) screw (d) pulley
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
11. 11.True or false: a fixed pulley needs effort = load. (a) False (b) True
12. 12.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Kabir (180 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
14. 14.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.⚖️ A seesaw balances. Asha (400 N) sits 2 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.True or false: a fixed pulley only changes direction. (a) True (b) False
18. 18.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
19. 19.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
20. 20.⚙️ Which simple machine is a knife edge? (a) lever (b) wedge (c) inclined plane (d) screw
21. 21.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
23. 23.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
24. 24.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
25. 25.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
26. 26.True or false: a well winch handle is a pulley. (a) True (b) False
27. 27.💪 Which force is at work: a compass needle turns? (a) magnetic force (b) friction (c) muscular force (d) gravity
28. 28.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
29. 29.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its shape (d) change its colour
30. 30.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
31. 31.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 14 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
33. 33.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
34. 34.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
35. 35.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
36. 36.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
39. 39.🔍 Which is the odd one out? (a) a bottle opener (b) a round doorknob (c) a crowbar (d) a seesaw
40. 40.True or false: a rough doormat gives less friction. (a) False (b) True

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