Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 713 · 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 bag has a mass of 10 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.⚖️ A seesaw balances. Zoya (280 N) sits 4 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
6. 6.💪 Which force is at work: rain falls to the ground? (a) friction (b) magnetic force (c) muscular force (d) gravity
7. 7.🏋️ Pushing a crate 6 m took 60 J of work. What force was used, in newtons?
8. 8.🔍 Which is the odd one out? (a) a crane hook block (b) a nut and bolt (c) a well-bucket rope wheel (d) a flagpole rope wheel
9. 9.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
12. 12.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
13. 13.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
14. 14.Which of these is caused by magnetic force? (a) pedalling a cycle (b) rubbing hands warms them (c) a compass needle turns (d) an apple falls down
15. 15.🏋️ A force of 310 N did 1240 J of work. How many metres did the object move?
16. 16.🏋️ Pushing a crate 5 m took 400 J of work. What force was used, in newtons?
17. 17.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.True or false: a chisel is a wedge. (a) True (b) False
19. 19.Which of these is a wedge? (a) a window blind cord (b) a road up a hill (c) an axe blade (d) a well winch handle
20. 20.💪 Which force is at work: squeezing a lemon? (a) friction (b) gravity (c) magnetic force (d) muscular force
21. 21.🏋️ A force of 420 N pushes a cart 3 m along the floor. How much work is done, in joules?
22. 22.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) on the pivot (d) closer to the pivot
23. 23.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
24. 24.💪 A force is a … (a) type of sound (b) push or a pull (c) unit of time (d) kind of colour
25. 25.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
26. 26.⚖️ A seesaw balances. Meena (300 N) sits 2 m from the pivot on one side; Arjun (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ 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
28. 28.🪝 A pulley system lifts a 1120 N load with an effort of 280 N. What is its mechanical advantage (MA)?
29. 29.💪 Which force is at work: a magnet picks up pins? (a) friction (b) magnetic force (c) muscular force (d) gravity
30. 30.Which of these is a lever? (a) a bottle cap (b) a nut and bolt (c) a wheelchair ramp (d) a bottle opener
31. 31.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
32. 32.⚙️ Which simple machine is a chisel? (a) pulley (b) wheel and axle (c) lever (d) wedge
33. 33.⚖️ A seesaw balances. Zoya (150 N) sits 4 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚖️ A lever bar balances. The load is 480 N at 50 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) chalk on a gym bar
36. 36.⚖️ A seesaw balances. Arjun (390 N) sits 2 m from the pivot on one side; Asha (260 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.True or false: a nutcracker is a wedge. (a) True (b) False
38. 38.⚙️ Which simple machine is a nutcracker? (a) lever (b) inclined plane (c) wheel and axle (d) pulley
39. 39.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) screw (c) lever (d) inclined plane
40. 40.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 200 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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