Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 471 · 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 fixed pulley rises with the load. (a) False (b) True
2. 2.🪝 A load of 920 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
3. 3.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
4. 4.Which of these is caused by magnetic force? (a) a compass needle turns (b) a rolling ball slows (c) rain falls to the ground (d) pedalling a cycle
5. 5.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
6. 6.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
7. 7.True or false: a wet tiled floor gives more friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
10. 10.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
11. 11.🏋️ Pushing a crate 6 m took 1020 J of work. What force was used, in newtons?
12. 12.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) on the rock (d) near the fulcrum
13. 13.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
14. 14.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
16. 16.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed
17. 17.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Asha (600 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) change its shape (d) stop it moving
19. 19.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
21. 21.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
22. 22.⚖️ A lever bar balances. The load is 100 N at 30 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?
23. 23.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
24. 24.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
25. 25.⚖️ A seesaw balances. Ravi (570 N) sits ? m from the pivot on one side; Meena (570 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
26. 26.True or false: pulling up your socks is a pull. (a) True (b) False
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a well winch handle (d) a crane hook block
29. 29.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
31. 31.💪 Two children push a box to the right, one with 30 N and the other with 90 N. What is the net (total) force on the box, in newtons?
32. 32.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) muscular force (c) friction (d) gravity
33. 33.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) gravity (d) muscular force
34. 34.🏋️ A force of 230 N pushes a cart 5 m along the floor. How much work is done, in joules?
35. 35.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
36. 36.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
37. 37.⚙️ Which simple machine is a well-bucket rope wheel? (a) inclined plane (b) wedge (c) pulley (d) screw
38. 38.Which of these is an inclined plane? (a) a road up a hill (b) a seesaw (c) a bottle cap (d) a claw hammer on a nail
39. 39.True or false: a knife edge is an inclined plane. (a) True (b) False
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1

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