Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 231 · 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 force is at work: a thrown ball comes down? (a) gravity (b) magnetic force (c) friction (d) muscular force
2. 2.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
5. 5.True or false: a bottle cap is a screw. (a) False (b) True
6. 6.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
7. 7.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) friction (d) wind
8. 8.True or false: hitting a cricket ball is a pull. (a) False (b) True
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
10. 10.True or false: closing a drawer is a pull. (a) True (b) False
11. 11.⚙️ 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
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
13. 13.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) an apple falls down (c) a magnet picks up pins (d) shoes grip the floor
14. 14.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
16. 16.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.🏋️ A force of 500 N did 1000 J of work. How many metres did the object move?
18. 18.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
19. 19.Which of these is caused by gravity? (a) shoes grip the floor (b) a magnet picks up pins (c) a thrown ball comes down (d) squeezing a lemon
20. 20.True or false: pulling a cart is a pull. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a box pushed on carpet (d) oil on a squeaky hinge
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) skating on ice (d) a wet tiled floor
23. 23.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) wedge (c) pulley (d) wheel and axle
24. 24.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
25. 25.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
26. 26.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot
27. 27.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a truck loading ramp (d) a bottle opener
28. 28.True or false: a movable pulley stays in one place. (a) False (b) True
29. 29.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
30. 30.🏋️ A force of 150 N did 1500 J of work. How many metres did the object move?
31. 31.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
32. 32.True or false: sand on a slippery path gives less friction. (a) False (b) True
33. 33.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
35. 35.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Zoya (640 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.True or false: a fixed pulley halves the effort. (a) True (b) False
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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