Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 687 · 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.⚙️ Which simple machine is a playground slide? (a) wedge (b) lever (c) pulley (d) inclined plane
2. 2.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Kabir (300 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.Which of these is a wheel and axle? (a) a road up a hill (b) a nut and bolt (c) a steering wheel (d) a wheelchair ramp
4. 4.⚖️ A lever bar balances. The load is 640 N at ? cm from the fulcrum. The effort is 320 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
6. 6.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
7. 7.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
8. 8.🏋️ Pushing a crate 2 m took 660 J of work. What force was used, in newtons?
9. 9.True or false: kicking a football is a push. (a) True (b) False
10. 10.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a bottle cap (c) a road up a hill (d) a truck loading ramp
12. 12.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 70 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
14. 14.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
15. 15.True or false: kicking a football is a pull. (a) True (b) False
16. 16.Which of these is a screw? (a) a crane hook block (b) a road up a hill (c) a bottle cap (d) a claw hammer on a nail
17. 17.🏋️ Pushing a crate 8 m took 1760 J of work. What force was used, in newtons?
18. 18.🏋️ Pushing a crate 9 m took 1980 J of work. What force was used, in newtons?
19. 19.⚖️ A lever bar balances. The load is 560 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.⚖️ A lever bar balances. The load is 90 N at 50 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Ravi (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.⚖️ A seesaw balances. Meena (160 N) sits 4 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.True or false: a rough doormat gives more friction. (a) False (b) True
24. 24.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
26. 26.🏋️ 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
27. 27.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.Which of these is caused by gravity? (a) lifting a school bag (b) an apple falls down (c) squeezing a lemon (d) brakes stop a bicycle
29. 29.Which of these is a screw? (a) a crowbar (b) a wheelchair ramp (c) a jar lid (d) an axe blade
30. 30.Which of these is caused by gravity? (a) squeezing a lemon (b) a magnet picks up pins (c) a thrown ball comes down (d) a fridge magnet sticks
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) powder on a carrom board (d) a grippy rubber sole
32. 32.🪝 A bucket weighing 210 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
34. 34.🏋️ A force of 130 N did 1300 J of work. How many metres did the object move?
35. 35.🏋️ Pushing a crate 7 m took 1960 J of work. What force was used, in newtons?
36. 36.🛞 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 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
37. 37.⚖️ A seesaw balances. Asha (390 N) sits 4 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
39. 39.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
40. 40.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats

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