Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 599 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🏋️ A force of 340 N did 340 J of work. How many metres did the object move?
4. 4.🏋️ A force of 490 N did 1960 J of work. How many metres did the object move?
5. 5.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) inclined plane (c) pulley (d) lever
6. 6.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
7. 7.True or false: a movable pulley stays in one place. (a) False (b) True
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
9. 9.Which of these is a wedge? (a) a nutcracker (b) the tip of a nail (c) a water tap handle (d) a window blind cord
10. 10.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
11. 11.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Arjun (560 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
13. 13.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
14. 14.⚖️ 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
15. 15.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
16. 16.⚖️ A lever bar balances. The load is 360 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) powder on a carrom board (d) a rough doormat
18. 18.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) no change (d) more effort needed
19. 19.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
20. 20.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) start it moving (d) stop it moving
21. 21.True or false: a claw hammer on a nail is an inclined plane. (a) True (b) False
22. 22.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
23. 23.⚖️ A seesaw balances. Ravi (520 N) sits ? m from the pivot on one side; Meena (390 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
25. 25.True or false: powder on a carrom board gives less friction. (a) True (b) False
26. 26.True or false: a claw hammer on a nail is a pulley. (a) True (b) False
27. 27.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
28. 28.💪 Two children push a box to the right, one with 65 N and the other with 15 N. What is the net (total) force on the box, in newtons?
29. 29.🏋️ A force of 380 N pushes a cart 7 m along the floor. How much work is done, in joules?
30. 30.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
31. 31.⚖️ A seesaw balances. Asha (360 N) sits 1 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
33. 33.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
34. 34.True or false: your forearm is a class 2 lever (load in the middle). (a) True (b) False
35. 35.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
36. 36.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) muscular force (c) gravity (d) friction
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
38. 38.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.💪 Is kicking a football a push or a pull? (a) a push (b) a pull

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