Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 670 · 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 tyre with deep treads gives more friction. (a) False (b) True
2. 2.True or false: hitting a cricket ball is a push. (a) False (b) True
3. 3.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
4. 4.Which of these is caused by magnetic force? (a) shoes grip the floor (b) squeezing a lemon (c) a compass needle turns (d) pedalling a cycle
5. 5.⚖️ A lever bar balances. The load is 320 N at 50 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
7. 7.True or false: a rough doormat gives more friction. (a) True (b) False
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
12. 12.🔍 Which is the odd one out? (a) a nut and bolt (b) a screw jack (c) a water tap handle (d) a bottle cap
13. 13.True or false: pressing a doorbell is a push. (a) True (b) False
14. 14.💪 A bag has a mass of 38 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
16. 16.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
17. 17.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
18. 18.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) rain falls to the ground (d) a thrown ball comes down
19. 19.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
20. 20.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
22. 22.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape
23. 23.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) screw (c) wedge (d) lever
24. 24.🏋️ A force of 480 N pushes a cart 4 m along the floor. How much work is done, in joules?
25. 25.True or false: a movable pulley is on a flagpole top. (a) True (b) False
26. 26.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) doubled (d) balanced
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.True or false: the tip of a nail is a wedge. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) a wet tiled floor
30. 30.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
31. 31.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
32. 32.🪝 A pulley system lifts an 870 N load with an effort of 290 N. What is its mechanical advantage (MA)?
33. 33.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
34. 34.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
36. 36.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
37. 37.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
38. 38.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
40. 40.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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