Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 215 · 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: skating on ice gives more friction. (a) False (b) True
2. 2.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 910 N bucket on the axle, in newtons? (ideal)
3. 3.⚖️ A seesaw balances. Ravi (200 N) sits 2 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?
4. 4.⚙️ Which simple machine is a bottle opener? (a) wheel and axle (b) pulley (c) screw (d) lever
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
6. 6.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
8. 8.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.💪 In a tug of war, one team pulls left with 15 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
11. 11.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
12. 12.⚖️ A seesaw balances. Ravi (200 N) sits 3 m from the pivot on one side; Zoya (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
14. 14.🏋️ A force of 330 N did 2640 J of work. How many metres did the object move?
15. 15.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a jar lid (b) a round doorknob (c) a wood screw (d) a bottle cap
17. 17.⚖️ 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 3 (b) class 2 (c) class 1
18. 18.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
19. 19.⚖️ A seesaw balances. Meena (360 N) sits ? m from the pivot on one side; Arjun (240 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
20. 20.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
21. 21.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
22. 22.⚖️ A seesaw balances. Asha (220 N) sits 2 m from the pivot on one side; Arjun (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) newton (N) (d) metre (m)
25. 25.Which of these is a pulley? (a) a steering wheel (b) a wood screw (c) a flagpole rope wheel (d) a knife edge
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wheel on ball bearings (d) a tyre with deep treads
27. 27.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) powder on a carrom board (d) skating on ice
28. 28.🏋️ A force of 480 N pushes a cart 5 m along the floor. How much work is done, in joules?
29. 29.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle
30. 30.⚙️ Which simple machine is a playground slide? (a) inclined plane (b) wheel and axle (c) wedge (d) pulley
31. 31.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) far from the fulcrum (d) near the fulcrum
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
37. 37.🏋️ Pushing a crate 10 m took 1200 J of work. What force was used, in newtons?
38. 38.🔍 Which is the odd one out? (a) an axe blade (b) a door stopper (c) the tip of a nail (d) a bottle cap
39. 39.🔍 Which is the odd one out? (a) a screw jack (b) a wood screw (c) a truck loading ramp (d) a jar lid
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the pulley

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