Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 502 · 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.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
2. 2.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
3. 3.🏋️ Pushing a crate 4 m took 1320 J of work. What force was used, in newtons?
4. 4.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope
5. 5.💪 A box weighs 180 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) near the fulcrum (d) on the fulcrum
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.💪 A box weighs 120 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) pulley (c) lever (d) wheel and axle
11. 11.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) gravity (d) balanced
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) farther from the pivot (d) anywhere
13. 13.True or false: a truck loading ramp is a lever. (a) False (b) True
14. 14.🏋️ A force of 180 N did 180 J of work. How many metres did the object move?
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
16. 16.Which of these is caused by friction? (a) a magnet picks up pins (b) an apple falls down (c) a rolling ball slows (d) rain falls to the ground
17. 17.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) muscular force (d) friction
18. 18.🪝 A load of 580 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
21. 21.True or false: pressing a doorbell is a push. (a) True (b) False
22. 22.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?
23. 23.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
24. 24.True or false: a seesaw is a pulley. (a) False (b) True
25. 25.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
26. 26.💪 A bag has a mass of 53 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) nothing (d) the load
28. 28.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) wedge (c) screw (d) lever
29. 29.💪 Two children push a box to the right, one with 40 N and the other with 95 N. What is the net (total) force on the box, in newtons?
30. 30.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
32. 32.🏋️ Pushing a crate 9 m took 1170 J of work. What force was used, in newtons?
33. 33.⚖️ A seesaw balances. Meena (300 N) sits 4 m from the pivot on one side; Kabir (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚙️ Which simple machine is a bottle opener? (a) screw (b) pulley (c) lever (d) inclined plane
35. 35.🏋️ Pushing a crate 10 m took 2100 J of work. What force was used, in newtons?
36. 36.🔍 Which is the odd one out? (a) a chisel (b) the tip of a nail (c) a seesaw (d) a knife edge
37. 37.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.⚖️ A seesaw balances. Meena (170 N) sits 4 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ A force of 260 N did 2600 J of work. How many metres did the object move?
40. 40.🏋️ A force of 100 N did 700 J of work. How many metres did the object move?

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