Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 919 · 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. Kabir (? N) sits 4 m from the pivot on one side; Asha (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
3. 3.True or false: a movable pulley stays in one place. (a) True (b) False
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
5. 5.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
6. 6.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
8. 8.🔍 Which is the odd one out? (a) a seesaw (b) a crowbar (c) a bottle cap (d) a nutcracker
9. 9.🪝 A pulley system lifts a 180 N load with an effort of 90 N. What is its mechanical advantage (MA)?
10. 10.Which of these is a pulley? (a) a flagpole rope wheel (b) a screw jack (c) a nut and bolt (d) a door stopper
11. 11.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
13. 13.🔍 Which is the odd one out? (a) an axe blade (b) a well-bucket rope wheel (c) a crane hook block (d) a flagpole rope wheel
14. 14.True or false: a fixed pulley stays in one place. (a) False (b) True
15. 15.⚖️ A seesaw balances. Ravi (800 N) sits 3 m from the pivot on one side; Asha (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Zoya (540 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
18. 18.⚖️ A seesaw balances. Arjun (150 N) sits 1 m from the pivot on one side; Zoya (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
20. 20.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.⚖️ A lever bar balances. The load is 40 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?
24. 24.True or false: a seesaw is a lever. (a) False (b) True
25. 25.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.True or false: a fixed pulley only changes direction. (a) True (b) False
27. 27.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
28. 28.🏋️ A force of 70 N did 140 J of work. How many metres did the object move?
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.⚖️ A lever bar balances. The load is 360 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.🏋️ A force of 340 N did 3400 J of work. How many metres did the object move?
32. 32.Which of these is a lever? (a) a playground slide (b) an axe blade (c) a claw hammer on a nail (d) a chisel
33. 33.True or false: a grippy rubber sole gives more friction. (a) True (b) False
34. 34.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Zoya (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its shape (d) change its colour
36. 36.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the load (d) the fulcrum
38. 38.💪 In which unit do we measure force? (a) metre (m) (b) newton (N) (c) second (s) (d) litre (L)
39. 39.⚙️ Which simple machine is a screw jack? (a) pulley (b) screw (c) inclined plane (d) wedge
40. 40.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) friction (d) gravity

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