Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 695 · 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 machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
2. 2.True or false: closing a drawer is a pull. (a) True (b) False
3. 3.True or false: a seesaw is a pulley. (a) False (b) True
4. 4.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
5. 5.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 280 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ A seesaw balances. Meena (560 N) sits ? m from the pivot on one side; Arjun (140 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
8. 8.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
11. 11.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
12. 12.🏋️ Pushing a crate 3 m took 390 J of work. What force was used, in newtons?
13. 13.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
14. 14.True or false: a movable pulley stays in one place. (a) False (b) True
15. 15.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a bent lever (d) a kind of wheel
16. 16.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
17. 17.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
20. 20.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
21. 21.💪 A box weighs 540 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) sand on a slippery path (d) a wet tiled floor
23. 23.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
24. 24.⚖️ A seesaw balances. Meena (160 N) sits 3 m from the pivot on one side; Arjun (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🏋️ A force of 220 N pushes a cart 9 m along the floor. How much work is done, in joules?
28. 28.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
29. 29.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
30. 30.⚖️ A lever bar balances. The load is 480 N at ? cm from the fulcrum. The effort is 120 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
32. 32.Which of these is a pulley? (a) a nut and bolt (b) a playground slide (c) a round doorknob (d) a crane hook block
33. 33.Which of these is a lever? (a) a chisel (b) a knife edge (c) a nutcracker (d) a door stopper
34. 34.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
36. 36.💪 Two children push a box to the right, one with 10 N and the other with 75 N. What is the net (total) force on the box, in newtons?
37. 37.💪 A bag has a mass of 10 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
38. 38.True or false: a movable pulley needs effort = load. (a) False (b) True
39. 39.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction

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