Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 226 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
2. 2.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
3. 3.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
4. 4.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
5. 5.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) friction (d) muscular force
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
8. 8.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) friction (c) gravity (d) muscular force
9. 9.🏋️ Pushing a crate 7 m took 2380 J of work. What force was used, in newtons?
10. 10.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
11. 11.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the axle (d) the effort
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
13. 13.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (600 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
15. 15.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.💪 Which force is at work: an apple falls down? (a) muscular force (b) friction (c) magnetic force (d) gravity
17. 17.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
19. 19.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
20. 20.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
21. 21.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
22. 22.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
23. 23.⚖️ A seesaw balances. Asha (560 N) sits 1 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
25. 25.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
26. 26.True or false: a fixed pulley only changes direction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
29. 29.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a seesaw (c) a jar lid (d) a bottle opener
30. 30.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
31. 31.🏋️ A force of 470 N did 2350 J of work. How many metres did the object move?
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a smooth steel slide
33. 33.True or false: a wet tiled floor gives more friction. (a) False (b) True
34. 34.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
35. 35.True or false: closing a drawer is a push. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
37. 37.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
40. 40.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road

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