Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 381 · 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 rough doormat gives less friction. (a) True (b) False
2. 2.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
3. 3.💪 A bag has a mass of 51 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
5. 5.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
6. 6.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
7. 7.True or false: powder on a carrom board gives less friction. (a) True (b) False
8. 8.🏋️ Pushing a crate 4 m took 1440 J of work. What force was used, in newtons?
9. 9.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a kind of wheel (d) a ramp wrapped round
11. 11.⚙️ Which simple machine is a jar lid? (a) wheel and axle (b) wedge (c) inclined plane (d) screw
12. 12.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
13. 13.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 1 (c) class 2
14. 14.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
15. 15.🛞 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 3 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a chisel (b) a knife edge (c) an axe blade (d) a nutcracker
17. 17.🔍 Which is the odd one out? (a) a truck loading ramp (b) a window blind cord (c) a well-bucket rope wheel (d) a flagpole rope wheel
18. 18.💪 Which force pulls everything towards the Earth? (a) gravity (b) friction (c) wind (d) magnetism
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
20. 20.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a rope on a wheel (d) a bar on a pivot
21. 21.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 3 (c) class 1
22. 22.Which of these is a wheel and axle? (a) a nutcracker (b) a water tap handle (c) a jar lid (d) a bottle cap
23. 23.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
24. 24.True or false: a rough doormat gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
26. 26.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
27. 27.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
28. 28.🏋️ A force of 360 N did 360 J of work. How many metres did the object move?
29. 29.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?
30. 30.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
31. 31.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
32. 32.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a compass needle turns (c) rubbing hands warms them (d) squeezing a lemon
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) gravity (d) magnetic force
35. 35.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
36. 36.⚖️ A seesaw balances. Ravi (260 N) sits 1 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the effort (c) the pulley (d) the fulcrum
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
39. 39.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
40. 40.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False

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