Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 39 · 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.Which of these is caused by gravity? (a) a magnet picks up pins (b) rubbing hands warms them (c) a compass needle turns (d) an apple falls down
2. 2.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
3. 3.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
4. 4.Which of these is a screw? (a) a bottle opener (b) a knife edge (c) a screw jack (d) a nutcracker
5. 5.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
6. 6.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) stop all friction (d) switch off gravity
7. 7.💪 Which can a force NOT do? (a) stop it moving (b) change its shape (c) change its colour (d) start it moving
8. 8.⚙️ Which simple machine is a water tap handle? (a) pulley (b) wedge (c) inclined plane (d) wheel and axle
9. 9.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
10. 10.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
16. 16.💪 Two children push a box to the right, one with 50 N and the other with 5 N. What is the net (total) force on the box, in newtons?
17. 17.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) False (b) True
18. 18.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
21. 21.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
22. 22.Which of these is caused by gravity? (a) brakes stop a bicycle (b) a thrown ball comes down (c) a fridge magnet sticks (d) lifting a school bag
23. 23.💪 Two children push a box to the right, one with 30 N and the other with 35 N. What is the net (total) force on the box, in newtons?
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.True or false: kicking a football is a push. (a) True (b) False
26. 26.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) friction (c) muscular force (d) gravity
27. 27.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
28. 28.Which of these is a lever? (a) a door stopper (b) a nutcracker (c) a flagpole rope wheel (d) an axe blade
29. 29.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
30. 30.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
31. 31.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
33. 33.Which of these is a pulley? (a) a well winch handle (b) a nutcracker (c) a knife edge (d) a well-bucket rope wheel
34. 34.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
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 2 (b) class 3 (c) class 1
36. 36.⚖️ A seesaw balances. Asha (680 N) sits 4 m from the pivot on one side; Ravi (680 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
38. 38.⚖️ A lever bar balances. The load is 900 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 240 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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