Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 646 · 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 seesaw balances. Asha (240 N) sits 3 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wet tiled floor (d) a box pushed on carpet
4. 4.Which of these is a pulley? (a) the tip of a nail (b) a water tap handle (c) a door stopper (d) a window blind cord
5. 5.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
6. 6.💪 In a tug of war, one team pulls left with 75 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
7. 7.⚖️ A seesaw balances. Asha (570 N) sits ? m from the pivot on one side; Arjun (380 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
9. 9.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
10. 10.⚖️ A lever bar balances. The load is 900 N at ? cm from the fulcrum. The effort is 270 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
12. 12.💪 Which force is at work: pedalling a cycle? (a) gravity (b) friction (c) muscular force (d) magnetic force
13. 13.⚖️ A seesaw balances. Zoya (160 N) sits ? m from the pivot on one side; Asha (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
15. 15.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
16. 16.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) without moving it (d) very slowly
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.True or false: a rough doormat gives more friction. (a) True (b) False
19. 19.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
20. 20.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 180 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
22. 22.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
23. 23.🔍 Which is the odd one out? (a) a round doorknob (b) a jar lid (c) a nut and bolt (d) a screw jack
24. 24.🔍 Which is the odd one out? (a) a steering wheel (b) a truck loading ramp (c) a playground slide (d) a wheelchair ramp
25. 25.🏋️ A force of 220 N did 220 J of work. How many metres did the object move?
26. 26.🏋️ A force of 250 N pushes a cart 4 m along the floor. How much work is done, in joules?
27. 27.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 70 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ A lever bar balances. The load is 800 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.True or false: a tyre with deep treads gives more friction. (a) False (b) True
30. 30.🏋️ A force of 460 N did 2300 J of work. How many metres did the object move?
31. 31.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
32. 32.True or false: closing a drawer is a push. (a) False (b) True
33. 33.Which of these is caused by friction? (a) a magnet picks up pins (b) brakes stop a bicycle (c) pedalling a cycle (d) a fridge magnet sticks
34. 34.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
35. 35.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
36. 36.🪝 A winch has a wheel of radius 40 cm and an axle of radius 5 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
37. 37.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
38. 38.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
39. 39.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) switch off gravity (d) make new energy
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3

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