Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 138 · 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 60 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A lever bar balances. The load is 120 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
6. 6.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) friction (c) magnetic force (d) gravity
7. 7.⚖️ A lever bar balances. The load is 810 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.True or false: a well winch handle is a wheel and axle. (a) True (b) False
11. 11.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
13. 13.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (180 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a rough doormat (d) chalk on a gym bar
16. 16.🔍 Which is the odd one out? (a) a nut and bolt (b) a knife edge (c) a door stopper (d) the tip of a nail
17. 17.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
18. 18.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
19. 19.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.🏋️ A force of 100 N did 200 J of work. How many metres did the object move?
21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
22. 22.🏋️ A force of 470 N pushes a cart 1 m along the floor. How much work is done, in joules?
23. 23.🔍 Which is the odd one out? (a) a wood screw (b) a bottle opener (c) a claw hammer on a nail (d) a seesaw
24. 24.🏋️ Pushing a crate 10 m took 2500 J of work. What force was used, in newtons?
25. 25.Which of these is a screw? (a) a nutcracker (b) a knife edge (c) a well winch handle (d) a wood screw
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.Which of these is a lever? (a) a jar lid (b) a wood screw (c) a crane hook block (d) a bottle opener
28. 28.💪 A box weighs 400 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.⚖️ A seesaw balances. Meena (540 N) sits ? m from the pivot on one side; Zoya (720 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a wheel on ball bearings (d) powder on a carrom board
32. 32.Which of these is a pulley? (a) a nutcracker (b) a knife edge (c) a nut and bolt (d) a well-bucket rope wheel
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.True or false: chalk on a gym bar gives less friction. (a) True (b) False
35. 35.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
36. 36.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (220 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
38. 38.⚙️ Which simple machine is a steering wheel? (a) wheel and axle (b) wedge (c) pulley (d) screw
39. 39.🏋️ A force of 100 N pushes a cart 6 m along the floor. How much work is done, in joules?
40. 40.True or false: kicking a football is a push. (a) False (b) True

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