Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 182 · 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 load of 220 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.⚖️ A seesaw balances. Arjun (440 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.True or false: chalk on a gym bar gives less friction. (a) False (b) True
4. 4.⚙️ Which simple machine is a steering wheel? (a) wedge (b) wheel and axle (c) lever (d) inclined plane
5. 5.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) gravity (c) magnetic force (d) friction
6. 6.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
7. 7.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
8. 8.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
9. 9.True or false: opening a drawer is a pull. (a) False (b) True
10. 10.🏋️ Pushing a crate 8 m took 1040 J of work. What force was used, in newtons?
11. 11.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
12. 12.🏋️ Pushing a crate 8 m took 160 J of work. What force was used, in newtons?
13. 13.💪 Two children push a box to the right, one with 100 N and the other with 85 N. What is the net (total) force on the box, in newtons?
14. 14.True or false: a fixed pulley needs effort = load. (a) True (b) False
15. 15.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
16. 16.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Arjun (320 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
19. 19.True or false: a movable pulley stays in one place. (a) True (b) False
20. 20.⚖️ A seesaw balances. Zoya (140 N) sits ? m from the pivot on one side; Meena (140 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
21. 21.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
22. 22.🏋️ 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?
23. 23.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
24. 24.🔍 Which is the odd one out? (a) a jar lid (b) a nut and bolt (c) a bottle opener (d) a bottle cap
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 10 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
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) a grippy rubber sole
27. 27.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
28. 28.⚖️ A seesaw balances. Asha (450 N) sits ? m from the pivot on one side; Zoya (150 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
29. 29.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ A seesaw balances. Arjun (220 N) sits 2 m from the pivot on one side; Meena (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
32. 32.True or false: hitting a cricket ball is a push. (a) False (b) True
33. 33.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
34. 34.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
35. 35.💪 A cart is pulled to the right with 25 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
37. 37.True or false: drawing up a well bucket is a pull. (a) True (b) False
38. 38.💪 A bag has a mass of 55 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
40. 40.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True

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