Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 949 · 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 fixed pulley is on a flagpole top. (a) False (b) True
2. 2.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
3. 3.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) oil on a squeaky hinge
6. 6.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
11. 11.True or false: plucking a mango is a pull. (a) True (b) False
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wet tiled floor (d) chalk on a gym bar
15. 15.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
16. 16.⚙️ Which simple machine is a nut and bolt? (a) pulley (b) screw (c) lever (d) inclined plane
17. 17.🏋️ Pushing a crate 5 m took 900 J of work. What force was used, in newtons?
18. 18.⚖️ A lever bar balances. The load is 140 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) on the pivot (d) anywhere
20. 20.⚖️ A lever bar balances. The load is 400 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.Which of these is caused by muscular force? (a) a compass needle turns (b) lifting a school bag (c) brakes stop a bicycle (d) a rolling ball slows
22. 22.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
23. 23.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
25. 25.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 210 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.⚙️ Which simple machine is a seesaw? (a) pulley (b) wheel and axle (c) lever (d) inclined plane
27. 27.🏋️ A force of 100 N pushes a cart 4 m along the floor. How much work is done, in joules?
28. 28.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 60 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
30. 30.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
31. 31.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
32. 32.🏋️ A force of 500 N did 1500 J of work. How many metres did the object move?
33. 33.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
34. 34.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
35. 35.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
36. 36.⚖️ A seesaw balances. Zoya (240 N) sits 3 m from the pivot on one side; Kabir (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.Which of these is a lever? (a) a screw jack (b) a window blind cord (c) a water tap handle (d) a seesaw
40. 40.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

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