Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 325 · 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.💪 Two children push a box to the right, one with 65 N and the other with 75 N. What is the net (total) force on the box, in newtons?
2. 2.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
3. 3.⚖️ A seesaw balances. Meena (170 N) sits ? m from the pivot on one side; Kabir (340 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
4. 4.💪 In a tug of war, one team pulls right with 40 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
5. 5.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
6. 6.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
8. 8.True or false: a jar lid is a screw. (a) False (b) True
9. 9.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
10. 10.🛞 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 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
13. 13.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
14. 14.🏋️ Pushing a crate 9 m took 4230 J of work. What force was used, in newtons?
15. 15.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.🏋️ A force of 370 N pushes a cart 2 m along the floor. How much work is done, in joules?
19. 19.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Meena (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
21. 21.🏋️ Pushing a crate 7 m took 490 J of work. What force was used, in newtons?
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
24. 24.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
26. 26.⚙️ Which simple machine is a bottle cap? (a) inclined plane (b) screw (c) lever (d) wedge
27. 27.True or false: a movable pulley only changes direction. (a) True (b) False
28. 28.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) stop it moving (d) change its shape
29. 29.⚖️ A seesaw balances. Meena (280 N) sits 2 m from the pivot on one side; Kabir (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
32. 32.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
33. 33.🏋️ A force of 200 N pushes a cart 2 m along the floor. How much work is done, in joules?
34. 34.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) nothing (d) the effort
35. 35.🛞 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 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
37. 37.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.🏋️ Pushing a crate 6 m took 2760 J of work. What force was used, in newtons?
39. 39.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
40. 40.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?

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