Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 554 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.🏋️ A force of 480 N pushes a cart 10 m along the floor. How much work is done, in joules?
4. 4.💪 Two children push a box to the right, one with 100 N and the other with 20 N. What is the net (total) force on the box, in newtons?
5. 5.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) muscular force (d) magnetic force
6. 6.Which of these is caused by gravity? (a) a thrown ball comes down (b) pedalling a cycle (c) brakes stop a bicycle (d) lifting a school bag
7. 7.💪 Which force is at work: a compass needle turns? (a) magnetic force (b) muscular force (c) friction (d) gravity
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
9. 9.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
10. 10.💪 Two children push a box to the right, one with 70 N and the other with 10 N. What is the net (total) force on the box, in newtons?
11. 11.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) friction (d) magnetism
12. 12.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
13. 13.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
15. 15.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
17. 17.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the effort (c) the load (d) the fulcrum
18. 18.⚖️ A lever bar balances. The load is 490 N at ? cm from the fulcrum. The effort is 280 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.Which of these is a screw? (a) a knife edge (b) a bottle cap (c) a flagpole rope wheel (d) a crowbar
20. 20.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
21. 21.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.🏋️ A force of 400 N did 1200 J of work. How many metres did the object move?
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
24. 24.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
25. 25.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
26. 26.🏋️ A force of 110 N did 1100 J of work. How many metres did the object move?
27. 27.💪 In a tug of war, one team pulls left with 95 N and the other pulls right with 55 N. What is the size of the net force, in newtons?
28. 28.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
30. 30.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
31. 31.True or false: drawing up a well bucket is a pull. (a) False (b) True
32. 32.True or false: closing a drawer is a push. (a) True (b) False
33. 33.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
34. 34.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the fulcrum (d) the load
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
37. 37.🏋️ Pushing a crate 5 m took 700 J of work. What force was used, in newtons?
38. 38.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
39. 39.True or false: powder on a carrom board gives less friction. (a) False (b) True
40. 40.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp

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