Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 132 · 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 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 60 N bucket on the axle, in newtons? (ideal)
2. 2.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Meena (300 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
5. 5.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a rough doormat (d) a box pushed on carpet
7. 7.💪 In a tug of war, one team pulls right with 60 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
8. 8.True or false: a wet tiled floor gives more friction. (a) False (b) True
9. 9.🏋️ A force of 50 N did 400 J of work. How many metres did the object move?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.Which of these is caused by muscular force? (a) pedalling a cycle (b) a compass needle turns (c) brakes stop a bicycle (d) a river flows downhill
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
14. 14.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
16. 16.⚖️ A seesaw balances. Arjun (240 N) sits 4 m from the pivot on one side; Kabir (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
18. 18.⚖️ 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 1 (b) class 2 (c) class 3
19. 19.💪 Which force is at work: a rolling ball slows? (a) friction (b) gravity (c) muscular force (d) magnetic force
20. 20.🪝 A pulley system lifts a 200 N load with an effort of 50 N. What is its mechanical advantage (MA)?
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
23. 23.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
24. 24.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
25. 25.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
26. 26.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
27. 27.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
28. 28.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) a jar lid (b) a road up a hill (c) a truck loading ramp (d) a playground slide
30. 30.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
31. 31.Which of these is a wedge? (a) a nut and bolt (b) a nutcracker (c) a crowbar (d) a knife edge
32. 32.Which of these is a lever? (a) a wheelchair ramp (b) an axe blade (c) a road up a hill (d) a nutcracker
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
34. 34.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
36. 36.Which of these is a lever? (a) a jar lid (b) a seesaw (c) a playground slide (d) a steering wheel
37. 37.⚙️ Which simple machine is a wood screw? (a) pulley (b) wedge (c) screw (d) lever
38. 38.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.💪 A box weighs 90 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?

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