Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 902 · 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 balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
2. 2.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
4. 4.⚖️ A seesaw balances. Arjun (570 N) sits 4 m from the pivot on one side; Zoya (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🔍 Which is the odd one out? (a) a door stopper (b) a playground slide (c) the tip of a nail (d) an axe blade
7. 7.True or false: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
8. 8.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.⚙️ Which simple machine is a steering wheel? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
12. 12.⚙️ Which simple machine is a well-bucket rope wheel? (a) screw (b) pulley (c) inclined plane (d) lever
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
14. 14.🔍 Which is the odd one out? (a) a window blind cord (b) a knife edge (c) a flagpole rope wheel (d) a crane hook block
15. 15.🏋️ Pushing a crate 8 m took 1280 J of work. What force was used, in newtons?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
17. 17.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
18. 18.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.💪 A box weighs 50 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
21. 21.💪 A cart is pulled to the right with 65 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
22. 22.⚖️ A seesaw balances. Asha (360 N) sits ? m from the pivot on one side; Zoya (240 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
23. 23.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
24. 24.⚖️ A seesaw balances. Asha (240 N) sits 4 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
26. 26.💪 A cart is pulled to the right with 85 N and to the left with 75 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
27. 27.🪝 A pulley system lifts a 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
28. 28.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
29. 29.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crowbar (c) a steering wheel (d) a nutcracker
30. 30.True or false: kicking a football is a push. (a) True (b) False
31. 31.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
32. 32.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
33. 33.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
35. 35.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
36. 36.True or false: a seesaw is a lever. (a) False (b) True
37. 37.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
38. 38.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
39. 39.True or false: pushing a trolley is a pull. (a) True (b) False
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction

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