Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 62 · 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.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
2. 2.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the effort (d) the load
3. 3.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
5. 5.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
6. 6.💪 Two children push a box to the right, one with 20 N and the other with 45 N. What is the net (total) force on the box, in newtons?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
8. 8.True or false: a nut and bolt is a screw. (a) True (b) False
9. 9.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
10. 10.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.Which of these is an inclined plane? (a) a knife edge (b) a nut and bolt (c) a bottle cap (d) a road up a hill
13. 13.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) change its shape (d) start it moving
14. 14.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
15. 15.True or false: a movable pulley rises with the load. (a) False (b) True
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
17. 17.True or false: a knife edge is a screw. (a) False (b) True
18. 18.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
19. 19.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
20. 20.True or false: a crowbar is a lever. (a) True (b) False
21. 21.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
23. 23.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.True or false: a grippy rubber sole gives less friction. (a) False (b) True
25. 25.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
26. 26.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
27. 27.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
28. 28.True or false: a truck loading ramp is an inclined plane. (a) True (b) False
29. 29.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
30. 30.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
32. 32.True or false: sand on a slippery path gives less friction. (a) False (b) True
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
35. 35.True or false: a tug of war is a push. (a) True (b) False
36. 36.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
37. 37.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
38. 38.Which of these is caused by gravity? (a) pedalling a cycle (b) brakes stop a bicycle (c) rain falls to the ground (d) a compass needle turns
39. 39.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) balanced (d) unbalanced
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet

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