Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 60 · 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: pulling a cart is a push. (a) True (b) False
2. 2.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
3. 3.🏋️ Pushing a crate 4 m took 600 J of work. What force was used, in newtons?
4. 4.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
5. 5.⚖️ A lever bar balances. The load is 60 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🏋️ A force of 140 N pushes a cart 9 m along the floor. How much work is done, in joules?
9. 9.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.True or false: a claw hammer on a nail is a pulley. (a) False (b) True
13. 13.True or false: a movable pulley is on a flagpole top. (a) True (b) False
14. 14.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) time taken (d) mass of fulcrum
15. 15.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
16. 16.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
18. 18.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) False (b) True
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 110 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
22. 22.💪 A bag has a mass of 50 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
24. 24.Which of these is caused by magnetic force? (a) rain falls to the ground (b) an apple falls down (c) a magnet picks up pins (d) rubbing hands warms them
25. 25.🔍 Which is the odd one out? (a) a door stopper (b) a well-bucket rope wheel (c) a chisel (d) a knife edge
26. 26.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
27. 27.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Arjun (520 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
30. 30.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
31. 31.True or false: a playground slide is an inclined plane. (a) False (b) True
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
34. 34.Which of these is caused by gravity? (a) rubbing hands warms them (b) squeezing a lemon (c) brakes stop a bicycle (d) a river flows downhill
35. 35.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
37. 37.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) doubled (d) unbalanced
38. 38.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) muscular force (c) gravity (d) magnetic force
39. 39.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
40. 40.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False

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