Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 960 · 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 load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🏋️ Pushing a crate 3 m took 390 J of work. What force was used, in newtons?
3. 3.🔍 Which is the odd one out? (a) a seesaw (b) a crowbar (c) the tip of a nail (d) a bottle opener
4. 4.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
5. 5.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 240 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🔍 Which is the odd one out? (a) a playground slide (b) a wheelchair ramp (c) a road up a hill (d) a crane hook block
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) muscular force (c) friction (d) gravity
9. 9.⚙️ Which simple machine is a door stopper? (a) lever (b) pulley (c) wedge (d) wheel and axle
10. 10.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
11. 11.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
12. 12.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚙️ Which simple machine is a well-bucket rope wheel? (a) screw (b) wedge (c) wheel and axle (d) pulley
14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
15. 15.⚖️ A seesaw balances. Ravi (600 N) sits 2 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) magnetism (d) gravity
17. 17.Which of these is a pulley? (a) a jar lid (b) a round doorknob (c) a well-bucket rope wheel (d) a water tap handle
18. 18.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
19. 19.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
20. 20.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
21. 21.⚖️ A seesaw balances. Kabir (600 N) sits 2 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
23. 23.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
25. 25.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
26. 26.💪 Two children push a box to the right, one with 10 N and the other with 70 N. What is the net (total) force on the box, in newtons?
27. 27.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
28. 28.True or false: a fixed pulley needs effort = load. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
30. 30.⚖️ A seesaw balances. Kabir (100 N) sits ? m from the pivot on one side; Ravi (300 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
31. 31.Which of these is a wheel and axle? (a) a truck loading ramp (b) a nutcracker (c) a steering wheel (d) a bottle opener
32. 32.⚖️ A seesaw balances. Asha (300 N) sits 4 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
34. 34.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) False (b) True
35. 35.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.💪 A bag has a mass of 9 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
38. 38.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
39. 39.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
40. 40.🏋️ A force of 460 N pushes a cart 4 m along the floor. How much work is done, in joules?

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