Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 344 · 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 machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
2. 2.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.True or false: a chisel is a wedge. (a) False (b) True
4. 4.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
5. 5.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
6. 6.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
7. 7.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.True or false: a movable pulley only changes direction. (a) True (b) False
11. 11.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
12. 12.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) wedge (c) pulley (d) screw
13. 13.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
14. 14.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) a river flows downhill (c) squeezing a lemon (d) brakes stop a bicycle
15. 15.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
16. 16.⚖️ A seesaw balances. Ravi (600 N) sits 1 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?
17. 17.⚖️ A seesaw balances. Asha (520 N) sits ? m from the pivot on one side; Kabir (390 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ A seesaw balances. Ravi (120 N) sits 4 m from the pivot on one side; Meena (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
20. 20.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
23. 23.Which of these is a wheel and axle? (a) a bottle cap (b) a crowbar (c) a playground slide (d) a water tap handle
24. 24.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
25. 25.🔍 Which is the odd one out? (a) a crane hook block (b) a chisel (c) a flagpole rope wheel (d) a window blind cord
26. 26.⚙️ Which simple machine is a nut and bolt? (a) wheel and axle (b) lever (c) screw (d) wedge
27. 27.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
28. 28.True or false: a box pushed on carpet gives more friction. (a) False (b) True
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.🏋️ 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?
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
32. 32.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
33. 33.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
34. 34.⚙️ A wedge is … (a) two ramps back to back (b) a rope on a wheel (c) a bar on a pivot (d) a wheel on a rod
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
36. 36.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.🏋️ A force of 470 N pushes a cart 8 m along the floor. How much work is done, in joules?
38. 38.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
39. 39.True or false: the tip of a nail is a lever. (a) True (b) False
40. 40.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?

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