Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 627 · 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 pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
2. 2.Which of these is caused by gravity? (a) rubbing hands warms them (b) brakes stop a bicycle (c) a river flows downhill (d) shoes grip the floor
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
4. 4.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the pulley (d) the load
5. 5.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
6. 6.🏋️ A force of 360 N did 2160 J of work. How many metres did the object move?
7. 7.True or false: pushing a swing is a pull. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
9. 9.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
10. 10.🪝 A load of 360 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.🏋️ Pushing a crate 3 m took 900 J of work. What force was used, in newtons?
12. 12.⚙️ Which simple machine is a knife edge? (a) inclined plane (b) pulley (c) wedge (d) lever
13. 13.Which of these is caused by gravity? (a) shoes grip the floor (b) rubbing hands warms them (c) rain falls to the ground (d) brakes stop a bicycle
14. 14.Which of these is caused by muscular force? (a) a thrown ball comes down (b) pedalling a cycle (c) a rolling ball slows (d) rain falls to the ground
15. 15.⚖️ A lever bar balances. The load is 160 N at 30 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🏋️ A force of 150 N pushes a cart 1 m along the floor. How much work is done, in joules?
17. 17.⚖️ A lever bar balances. The load is 160 N at 40 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
19. 19.⚖️ 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
20. 20.True or false: pushing a trolley is a pull. (a) False (b) True
21. 21.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 140 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.🏋️ A force of 380 N did 1140 J of work. How many metres did the object move?
23. 23.True or false: pulling a cart is a push. (a) True (b) False
24. 24.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
26. 26.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
27. 27.True or false: a movable pulley is on a flagpole top. (a) False (b) True
28. 28.⚖️ A lever bar balances. The load is 270 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
32. 32.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) muscular force (d) gravity
33. 33.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) muscular force (c) magnetic force (d) friction
34. 34.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
35. 35.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
36. 36.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
37. 37.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
38. 38.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy

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