Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 527 · 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 smooth ramp is 12 m long and rises 3 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
2. 2.🏋️ Pushing a crate 7 m took 280 J of work. What force was used, in newtons?
3. 3.True or false: kicking a football is a pull. (a) False (b) True
4. 4.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
5. 5.True or false: a well winch handle is a wheel and axle. (a) False (b) True
6. 6.💪 Which force is at work: a compass needle turns? (a) magnetic force (b) friction (c) gravity (d) muscular force
7. 7.True or false: a rough doormat gives less friction. (a) False (b) True
8. 8.True or false: pulling a cart is a push. (a) False (b) True
9. 9.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 12 (d) 6
10. 10.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
16. 16.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
19. 19.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
20. 20.True or false: a movable pulley only changes direction. (a) True (b) False
21. 21.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
22. 22.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
23. 23.⚖️ A lever bar balances. The load is 150 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.Which of these is a wheel and axle? (a) a knife edge (b) a seesaw (c) a wood screw (d) a steering wheel
25. 25.🏋️ A force of 240 N did 960 J of work. How many metres did the object move?
26. 26.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
27. 27.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
28. 28.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
29. 29.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.⚙️ Which simple machine is a road up a hill? (a) pulley (b) lever (c) wheel and axle (d) inclined plane
33. 33.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) friction (c) gravity (d) magnetic force
34. 34.True or false: skating on ice gives more friction. (a) False (b) True
35. 35.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
36. 36.⚖️ A lever bar balances. The load is 180 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.🏋️ A force of 380 N pushes a cart 1 m along the floor. How much work is done, in joules?
38. 38.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
39. 39.True or false: a nut and bolt is a pulley. (a) False (b) True
40. 40.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?

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