Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 267 · 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 movable pulley is on a flagpole top. (a) True (b) False
2. 2.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.⚙️ Which simple machine is a road up a hill? (a) pulley (b) inclined plane (c) screw (d) wedge
5. 5.True or false: sand on a slippery path gives less friction. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
7. 7.⚙️ 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
8. 8.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
9. 9.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
10. 10.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
11. 11.True or false: a door stopper is a wedge. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
13. 13.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.💪 In a tug of war, one team pulls left with 75 N and the other pulls right with 50 N. What is the size of the net force, in newtons?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
16. 16.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
17. 17.⚖️ 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
18. 18.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
19. 19.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
20. 20.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) stop it moving (d) start it moving
21. 21.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
22. 22.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
24. 24.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) far from the fulcrum (d) on the fulcrum
25. 25.⚖️ A seesaw balances. Asha (110 N) sits 3 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Meena (440 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
27. 27.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
28. 28.🔍 Which is the odd one out? (a) a crane hook block (b) a nutcracker (c) a well-bucket rope wheel (d) a flagpole rope wheel
29. 29.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
30. 30.True or false: a knife edge is a screw. (a) True (b) False
31. 31.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.🏋️ Pushing a crate 5 m took 1600 J of work. What force was used, in newtons?
33. 33.⚖️ A seesaw balances. Arjun (360 N) sits 4 m from the pivot on one side; Ravi (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.Which of these is a wheel and axle? (a) a water tap handle (b) a chisel (c) a wood screw (d) a wheelchair ramp
37. 37.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
38. 38.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)

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