Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 822 · 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.True or false: a well winch handle is a wheel and axle. (a) True (b) False
2. 2.Which of these is a screw? (a) a screw jack (b) a flagpole rope wheel (c) a truck loading ramp (d) a seesaw
3. 3.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
4. 4.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
5. 5.💪 Which can a force NOT do? (a) change its shape (b) stop it moving (c) change its colour (d) start it moving
6. 6.💪 Which force is at work: an apple falls down? (a) muscular force (b) gravity (c) magnetic force (d) friction
7. 7.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
9. 9.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) gravity (c) friction (d) muscular force
10. 10.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
11. 11.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
12. 12.⚖️ A lever bar balances. The load is 270 N at 50 cm from the fulcrum. The effort is 450 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a box pushed on carpet (d) a grippy rubber sole
15. 15.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a jar lid (b) a truck loading ramp (c) a playground slide (d) a road up a hill
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a smooth steel slide (d) skating on ice
18. 18.⚙️ Which simple machine is a well winch handle? (a) pulley (b) wheel and axle (c) lever (d) inclined plane
19. 19.Which of these is caused by muscular force? (a) a rolling ball slows (b) a fridge magnet sticks (c) squeezing a lemon (d) a magnet picks up pins
20. 20.True or false: a bottle opener is an inclined plane. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) powder on a carrom board (d) a grippy rubber sole
22. 22.⚙️ Which simple machine is a crowbar? (a) lever (b) pulley (c) wedge (d) screw
23. 23.🏋️ A force of 410 N did 820 J of work. How many metres did the object move?
24. 24.💪 Two children push a box to the right, one with 20 N and the other with 75 N. What is the net (total) force on the box, in newtons?
25. 25.True or false: a flagpole rope wheel is a wedge. (a) True (b) False
26. 26.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
27. 27.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) sand on a slippery path (d) powder on a carrom board
28. 28.🔍 Which is the odd one out? (a) a round doorknob (b) a knife edge (c) a well winch handle (d) a steering wheel
29. 29.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
30. 30.True or false: a movable pulley only changes direction. (a) True (b) False
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
32. 32.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
33. 33.True or false: a fixed pulley stays in one place. (a) True (b) False
34. 34.True or false: hitting a cricket ball is a pull. (a) True (b) False
35. 35.⚖️ A lever bar balances. The load is 300 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
37. 37.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
38. 38.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) wind (d) magnetism
39. 39.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
40. 40.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2

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