Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 188 · 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.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
2. 2.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
3. 3.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.🏋️ A force of 180 N pushes a cart 10 m along the floor. How much work is done, in joules?
6. 6.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) a tyre with deep treads
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
10. 10.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Ravi (720 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) friction (c) muscular force (d) gravity
13. 13.⚙️ Which simple machine is a wheelchair ramp? (a) wheel and axle (b) inclined plane (c) screw (d) wedge
14. 14.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
15. 15.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) the axle
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) a jar lid (b) a bottle cap (c) a window blind cord (d) a wood screw
19. 19.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
20. 20.True or false: a fixed pulley only changes direction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
22. 22.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
23. 23.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
26. 26.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
27. 27.🔍 Which is the odd one out? (a) an axe blade (b) a well winch handle (c) a door stopper (d) a chisel
28. 28.💪 Which force is at work: lifting a school bag? (a) muscular force (b) friction (c) magnetic force (d) gravity
29. 29.True or false: a bottle opener is a pulley. (a) True (b) False
30. 30.⚖️ A lever bar balances. The load is 280 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
32. 32.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (640 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🏋️ A force of 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
34. 34.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
36. 36.🔍 Which is the odd one out? (a) a seesaw (b) a claw hammer on a nail (c) the tip of a nail (d) a crowbar
37. 37.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
38. 38.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
39. 39.⚖️ A seesaw balances. Ravi (120 N) sits ? m from the pivot on one side; Meena (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
40. 40.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?

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