Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 757 · 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 pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
2. 2.💪 A bag has a mass of 47 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.True or false: closing a drawer is a push. (a) False (b) True
4. 4.True or false: a movable pulley stays in one place. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a smooth steel slide (d) skating on ice
6. 6.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
7. 7.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
9. 9.💪 Which force is at work: a compass needle turns? (a) muscular force (b) gravity (c) magnetic force (d) friction
10. 10.True or false: a rough doormat gives less friction. (a) True (b) False
11. 11.💪 A box weighs 310 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🏋️ Pushing a crate 8 m took 2960 J of work. What force was used, in newtons?
13. 13.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (600 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.💪 Which force is at work: squeezing a lemon? (a) friction (b) magnetic force (c) muscular force (d) gravity
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
18. 18.Which of these is a screw? (a) a bottle cap (b) a bottle opener (c) a nutcracker (d) a flagpole rope wheel
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
20. 20.💪 A force is a … (a) push or a pull (b) kind of colour (c) type of sound (d) unit of time
21. 21.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
22. 22.True or false: a bottle cap is a lever. (a) False (b) True
23. 23.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
24. 24.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
25. 25.💪 A cart is pulled to the right with 60 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.True or false: a grippy rubber sole gives less friction. (a) True (b) False
28. 28.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
32. 32.🪝 A load of 460 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
34. 34.🏋️ A force of 220 N did 660 J of work. How many metres did the object move?
35. 35.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
40. 40.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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