Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 744 · 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 seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Asha (150 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
3. 3.True or false: pulling up your socks is a push. (a) True (b) False
4. 4.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
7. 7.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
8. 8.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
9. 9.💪 A cart is pulled to the right with 95 N and to the left with 105 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
10. 10.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (120 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.⚖️ 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 2 (b) class 3 (c) class 1
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
13. 13.🪝 A load of 100 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
15. 15.💪 A cart is pulled to the right with 90 N and to the left with 80 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (480 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 1 (c) class 2
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: kicking a football is a pull. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.True or false: a water tap handle is a lever. (a) True (b) False
23. 23.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
24. 24.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
25. 25.Which of these is a pulley? (a) a well winch handle (b) a playground slide (c) a nutcracker (d) a well-bucket rope wheel
26. 26.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.🛞 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 9 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
28. 28.True or false: a movable pulley is on a flagpole top. (a) True (b) False
29. 29.⚖️ A seesaw balances. Arjun (540 N) sits 1 m from the pivot on one side; Zoya (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
31. 31.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a flagpole rope wheel (c) a round doorknob (d) a claw hammer on a nail
32. 32.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.⚖️ A seesaw balances. Kabir (240 N) sits 2 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
35. 35.True or false: a seesaw is a wedge. (a) False (b) True
36. 36.💪 Which force is at work: a river flows downhill? (a) gravity (b) muscular force (c) friction (d) magnetic force
37. 37.⚙️ Which simple machine is a nut and bolt? (a) lever (b) screw (c) inclined plane (d) pulley
38. 38.⚖️ A seesaw balances. Ravi (200 N) sits 4 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) far from the fulcrum (d) on the rock
40. 40.Which of these is caused by gravity? (a) a fridge magnet sticks (b) brakes stop a bicycle (c) a rolling ball slows (d) rain falls to the ground

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