Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 257 · 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.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 250 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ A force of 430 N pushes a cart 9 m along the floor. How much work is done, in joules?
3. 3.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
4. 4.True or false: a grippy rubber sole gives less friction. (a) False (b) True
5. 5.⚖️ A lever bar balances. The load is 400 N at 30 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.⚙️ Which simple machine is a well-bucket rope wheel? (a) wheel and axle (b) screw (c) inclined plane (d) pulley
8. 8.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🏋️ A force of 490 N pushes a cart 7 m along the floor. How much work is done, in joules?
11. 11.⚙️ Which simple machine is a road up a hill? (a) screw (b) inclined plane (c) wheel and axle (d) wedge
12. 12.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
14. 14.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
15. 15.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
16. 16.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
17. 17.💪 Two children push a box to the right, one with 20 N and the other with 10 N. What is the net (total) force on the box, in newtons?
18. 18.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
19. 19.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
20. 20.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) change its shape (d) stop it moving
22. 22.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) magnetism (d) gravity
23. 23.🔍 Which is the odd one out? (a) a jar lid (b) a screw jack (c) a nut and bolt (d) a wheelchair ramp
24. 24.⚖️ A seesaw balances. Zoya (760 N) sits 1 m from the pivot on one side; Asha (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.True or false: a crowbar is a wheel and axle. (a) True (b) False
26. 26.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
27. 27.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🏋️ Pushing a crate 1 m took 220 J of work. What force was used, in newtons?
29. 29.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
30. 30.⚙️ Which simple machine is a chisel? (a) screw (b) wedge (c) wheel and axle (d) inclined plane
31. 31.True or false: a fixed pulley only changes direction. (a) False (b) True
32. 32.⚖️ A seesaw balances. Ravi (760 N) sits ? m from the pivot on one side; Kabir (380 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.🏋️ A force of 360 N pushes a cart 4 m along the floor. How much work is done, in joules?
35. 35.🏋️ A force of 120 N did 360 J of work. How many metres did the object move?
36. 36.True or false: skating on ice gives more friction. (a) True (b) False
37. 37.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
39. 39.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
40. 40.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper

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