Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 44 · 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 17 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
3. 3.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.🏋️ A force of 120 N did 1200 J of work. How many metres did the object move?
6. 6.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
7. 7.⚖️ A seesaw balances. Asha (320 N) sits 4 m from the pivot on one side; Kabir (640 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a box pushed on carpet
9. 9.⚙️ Which simple machine is a claw hammer on a nail? (a) wedge (b) lever (c) inclined plane (d) pulley
10. 10.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
11. 11.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) start it moving (d) change its shape
12. 12.Which of these is a wheel and axle? (a) a screw jack (b) a bottle opener (c) a window blind cord (d) a steering wheel
13. 13.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
14. 14.⚖️ A seesaw balances. Meena (200 N) sits 2 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🔍 Which is the odd one out? (a) a truck loading ramp (b) a wheelchair ramp (c) a playground slide (d) a screw jack
16. 16.🏋️ 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?
17. 17.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
18. 18.⚖️ A seesaw balances. Kabir (440 N) sits 3 m from the pivot on one side; Arjun (330 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
20. 20.⚙️ Which simple machine is a nutcracker? (a) screw (b) wedge (c) pulley (d) lever
21. 21.True or false: chalk on a gym bar gives more friction. (a) True (b) False
22. 22.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.🏋️ A 6 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.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a rough doormat (d) skating on ice
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) pulley (c) inclined plane (d) wedge
27. 27.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
28. 28.💪 Two children push a box to the right, one with 50 N and the other with 15 N. What is the net (total) force on the box, in newtons?
29. 29.⚖️ A seesaw balances. Ravi (720 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.True or false: a truck loading ramp is a wheel and axle. (a) False (b) True
31. 31.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
33. 33.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
34. 34.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
35. 35.🪝 A load of 420 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
37. 37.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🏋️ Pushing a crate 2 m took 760 J of work. What force was used, in newtons?
39. 39.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
40. 40.True or false: a smooth steel slide gives more friction. (a) False (b) True

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