Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 327 · 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 screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
2. 2.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
3. 3.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
4. 4.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
5. 5.🏋️ Pushing a crate 3 m took 390 J of work. What force was used, in newtons?
6. 6.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
7. 7.True or false: pressing a doorbell is a pull. (a) True (b) False
8. 8.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.⚖️ A seesaw balances. Asha (220 N) sits 2 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
12. 12.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a rough doormat (d) a wet tiled floor
15. 15.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
16. 16.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
17. 17.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
18. 18.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
19. 19.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
20. 20.⚙️ Which simple machine is a claw hammer on a nail? (a) inclined plane (b) lever (c) pulley (d) screw
21. 21.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.💪 Two children push a box to the right, one with 90 N and the other with 5 N. What is the net (total) force on the box, in newtons?
24. 24.🔍 Which is the odd one out? (a) a nutcracker (b) a window blind cord (c) a seesaw (d) a claw hammer on a nail
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
26. 26.Which of these is caused by gravity? (a) a fridge magnet sticks (b) lifting a school bag (c) a river flows downhill (d) a compass needle turns
27. 27.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) the tip of a nail (b) a knife edge (c) a road up a hill (d) an axe blade
29. 29.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
30. 30.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.🏋️ Pushing a crate 6 m took 1620 J of work. What force was used, in newtons?
32. 32.⚖️ A seesaw balances. Kabir (760 N) sits 4 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
34. 34.Which of these is caused by muscular force? (a) rain falls to the ground (b) a rolling ball slows (c) a fridge magnet sticks (d) lifting a school bag
35. 35.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
36. 36.True or false: a bottle opener is a lever. (a) True (b) False
37. 37.True or false: opening a drawer is a push. (a) False (b) True
38. 38.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the axle (d) the load
39. 39.⚖️ A seesaw balances. Arjun (170 N) sits 2 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ A lever bar balances. The load is 180 N at ? cm from the fulcrum. The effort is 360 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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