Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 856 · 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.Which of these is caused by friction? (a) lifting a school bag (b) rain falls to the ground (c) rubbing hands warms them (d) pedalling a cycle
2. 2.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
3. 3.⚖️ A seesaw balances. Kabir (260 N) sits ? m from the pivot on one side; Meena (520 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
4. 4.⚙️ Which simple machine is a door stopper? (a) screw (b) lever (c) inclined plane (d) wedge
5. 5.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) farther from the pivot (d) anywhere
7. 7.🏋️ A force of 190 N did 950 J of work. How many metres did the object move?
8. 8.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
9. 9.💪 A bag has a mass of 49 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
11. 11.True or false: hitting a cricket ball is a push. (a) False (b) True
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
14. 14.Which of these is caused by friction? (a) a river flows downhill (b) rain falls to the ground (c) brakes stop a bicycle (d) a compass needle turns
15. 15.⚖️ A seesaw balances. Zoya (260 N) sits 4 m from the pivot on one side; Meena (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
17. 17.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
18. 18.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🏋️ Pushing a crate 1 m took 250 J of work. What force was used, in newtons?
21. 21.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
22. 22.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 100 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.True or false: a fixed pulley stays in one place. (a) False (b) True
24. 24.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
25. 25.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Asha (180 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
29. 29.🏋️ 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?
30. 30.True or false: skating on ice gives less friction. (a) True (b) False
31. 31.Which of these is caused by muscular force? (a) an apple falls down (b) squeezing a lemon (c) rubbing hands warms them (d) a river flows downhill
32. 32.True or false: a fixed pulley needs effort = load. (a) True (b) False
33. 33.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the load (d) the fulcrum
34. 34.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
37. 37.True or false: a box pushed on carpet gives less friction. (a) False (b) True
38. 38.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
39. 39.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a smooth steel slide (d) a box pushed on carpet

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