Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 819 · 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.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
3. 3.🔍 Which is the odd one out? (a) a wood screw (b) a bottle opener (c) a nutcracker (d) a claw hammer on a nail
4. 4.🏋️ Pushing a crate 7 m took 560 J of work. What force was used, in newtons?
5. 5.True or false: drawing up a well bucket is a push. (a) False (b) True
6. 6.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
7. 7.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
10. 10.True or false: a crowbar is a lever. (a) True (b) False
11. 11.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
12. 12.⚖️ A lever bar balances. The load is 400 N at 30 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ A seesaw balances. Arjun (640 N) sits 1 m from the pivot on one side; Meena (160 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.True or false: a movable pulley rises with the load. (a) True (b) False
17. 17.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
18. 18.🪝 A load of 560 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.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.💪 Two children push a box to the right, one with 90 N and the other with 75 N. What is the net (total) force on the box, in newtons?
23. 23.Which of these is a wheel and axle? (a) a playground slide (b) a road up a hill (c) a jar lid (d) a well winch handle
24. 24.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (300 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
27. 27.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Zoya (640 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
29. 29.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
30. 30.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
31. 31.Which of these is caused by gravity? (a) rubbing hands warms them (b) brakes stop a bicycle (c) a thrown ball comes down (d) a compass needle turns
32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope
33. 33.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.💪 A box weighs 300 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
38. 38.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
39. 39.True or false: a wood screw is a lever. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank

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