Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 794 · 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 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
5. 5.⚙️ Which simple machine is a window blind cord? (a) lever (b) screw (c) pulley (d) wheel and axle
6. 6.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
7. 7.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
8. 8.True or false: a water tap handle is a wheel and axle. (a) True (b) False
9. 9.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) muscular force (c) magnetic force (d) friction
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) a wet tiled floor
11. 11.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.Which of these is a wedge? (a) a chisel (b) a seesaw (c) a jar lid (d) a flagpole rope wheel
14. 14.True or false: plucking a mango is a pull. (a) True (b) False
15. 15.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
17. 17.True or false: a window blind cord is a screw. (a) True (b) False
18. 18.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
19. 19.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) screw (c) wheel and axle (d) lever
20. 20.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
21. 21.True or false: skating on ice gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a well winch handle (b) a round doorknob (c) a water tap handle (d) an axe blade
23. 23.⚖️ A lever bar balances. The load is 180 N at 40 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 40 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
26. 26.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
27. 27.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 350 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.True or false: kicking a football is a pull. (a) True (b) False
29. 29.⚖️ A lever bar balances. The load is 90 N at 20 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
31. 31.🔍 Which is the odd one out? (a) a nutcracker (b) a crowbar (c) a screw jack (d) a bottle opener
32. 32.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
35. 35.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
36. 36.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
37. 37.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
38. 38.True or false: a window blind cord is a wheel and axle. (a) True (b) False
39. 39.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
40. 40.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?

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