Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 431 · 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.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
3. 3.Which of these is caused by muscular force? (a) rain falls to the ground (b) squeezing a lemon (c) a rolling ball slows (d) a fridge magnet sticks
4. 4.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) gravity (d) muscular force
6. 6.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
7. 7.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
8. 8.⚖️ A seesaw balances. Asha (400 N) sits 2 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ A seesaw balances. Arjun (360 N) sits ? m from the pivot on one side; Kabir (180 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
10. 10.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) screw (c) wedge (d) wheel and axle
11. 11.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
13. 13.True or false: pulling up your socks is a pull. (a) False (b) True
14. 14.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
16. 16.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.⚖️ A seesaw balances. Asha (170 N) sits 4 m from the pivot on one side; Kabir (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (110 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
22. 22.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
23. 23.🏋️ Pushing a crate 6 m took 2220 J of work. What force was used, in newtons?
24. 24.🏋️ A force of 230 N pushes a cart 7 m along the floor. How much work is done, in joules?
25. 25.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
26. 26.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
27. 27.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
28. 28.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
29. 29.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
30. 30.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
31. 31.💪 Two children push a box to the right, one with 35 N and the other with 5 N. What is the net (total) force on the box, in newtons?
32. 32.🔍 Which is the odd one out? (a) a truck loading ramp (b) a well-bucket rope wheel (c) a playground slide (d) a road up a hill
33. 33.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) change its shape (d) stop it moving
34. 34.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
36. 36.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
37. 37.Which of these is caused by muscular force? (a) rubbing hands warms them (b) a magnet picks up pins (c) pedalling a cycle (d) a fridge magnet sticks
38. 38.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🪝 A load of 600 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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