Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 393 · 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 fixed pulley hangs on the rope loop. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
3. 3.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (100 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ A seesaw balances. Kabir (200 N) sits 2 m from the pivot on one side; Zoya (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ A lever bar balances. The load is 40 N at 50 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.💪 A box weighs 350 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
8. 8.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
9. 9.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
10. 10.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
11. 11.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
12. 12.⚖️ A seesaw balances. Asha (200 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
14. 14.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
15. 15.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
16. 16.💪 A box weighs 40 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
17. 17.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a wheel on ball bearings (d) a wet tiled floor
19. 19.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
20. 20.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
21. 21.⚙️ Which simple machine is a knife edge? (a) lever (b) pulley (c) wedge (d) inclined plane
22. 22.Which of these is caused by gravity? (a) shoes grip the floor (b) a fridge magnet sticks (c) an apple falls down (d) squeezing a lemon
23. 23.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 100 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.True or false: a tyre with deep treads gives more friction. (a) False (b) True
26. 26.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Meena (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.True or false: pulling up your socks is a pull. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
31. 31.🏋️ A force of 230 N did 460 J of work. How many metres did the object move?
32. 32.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
33. 33.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
34. 34.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
35. 35.True or false: a knife edge is an inclined plane. (a) True (b) False
36. 36.⚖️ A seesaw balances. Zoya (480 N) sits 1 m from the pivot on one side; Meena (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.💪 A cart is pulled to the right with 25 N and to the left with 10 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
38. 38.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
39. 39.🏋️ A force of 220 N did 660 J of work. How many metres did the object move?
40. 40.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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