Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 477 · 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.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.⚙️ A wedge is … (a) two ramps back to back (b) a rope on a wheel (c) a bar on a pivot (d) a wheel on a rod
3. 3.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 180 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
6. 6.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
7. 7.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
9. 9.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
10. 10.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
12. 12.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
14. 14.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
16. 16.Which of these is caused by gravity? (a) a compass needle turns (b) a fridge magnet sticks (c) pedalling a cycle (d) an apple falls down
17. 17.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
18. 18.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.True or false: kicking a football is a pull. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a round doorknob (b) a seesaw (c) a steering wheel (d) a water tap handle
22. 22.⚙️ Which simple machine is a claw hammer on a nail? (a) wedge (b) lever (c) screw (d) inclined plane
23. 23.🏋️ Pushing a crate 8 m took 160 J of work. What force was used, in newtons?
24. 24.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
25. 25.True or false: a fixed pulley rises with the load. (a) True (b) False
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
29. 29.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) friction (c) gravity (d) muscular force
30. 30.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
31. 31.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
32. 32.Which of these is a wedge? (a) a truck loading ramp (b) a bottle opener (c) a chisel (d) a well winch handle
33. 33.True or false: opening a drawer is a push. (a) False (b) True
34. 34.🏋️ A force of 30 N did 240 J of work. How many metres did the object move?
35. 35.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
36. 36.True or false: a wheelchair ramp is a pulley. (a) False (b) True
37. 37.Which of these is a lever? (a) a crowbar (b) a round doorknob (c) a well winch handle (d) a window blind cord
38. 38.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
39. 39.Which of these is an inclined plane? (a) a seesaw (b) a screw jack (c) a road up a hill (d) a flagpole rope wheel
40. 40.Which of these is a screw? (a) a well-bucket rope wheel (b) a jar lid (c) a bottle opener (d) a knife edge

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