Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 913 · 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.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a box pushed on carpet (d) powder on a carrom board
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 40 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wet tiled floor
8. 8.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
9. 9.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
10. 10.💪 Which can a force NOT do? (a) stop it moving (b) change its colour (c) change its shape (d) start it moving
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) sand on a slippery path (d) a grippy rubber sole
12. 12.⚖️ 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 2 (b) class 1 (c) class 3
13. 13.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
14. 14.Which of these is a screw? (a) a door stopper (b) a crowbar (c) a nut and bolt (d) a seesaw
15. 15.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.Which of these is a pulley? (a) a door stopper (b) a window blind cord (c) a seesaw (d) a bottle opener
17. 17.⚖️ A lever bar balances. The load is 500 N at 10 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) a compass needle turns (c) lifting a school bag (d) a river flows downhill
19. 19.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
21. 21.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
22. 22.⚖️ A seesaw balances. Kabir (510 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?
23. 23.🔍 Which is the odd one out? (a) a seesaw (b) a nutcracker (c) a crane hook block (d) a claw hammer on a nail
24. 24.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
25. 25.⚖️ A seesaw balances. Zoya (300 N) sits 1 m from the pivot on one side; Arjun (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.🏋️ A force of 300 N pushes a cart 6 m along the floor. How much work is done, in joules?
27. 27.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
29. 29.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
31. 31.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
32. 32.🏋️ A force of 440 N did 1320 J of work. How many metres did the object move?
33. 33.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
34. 34.Which of these is a lever? (a) a screw jack (b) a bottle opener (c) a wheelchair ramp (d) a wood screw
35. 35.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
36. 36.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
37. 37.True or false: a well-bucket rope wheel is a wedge. (a) False (b) True
38. 38.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
39. 39.⚙️ Which simple machine is a chisel? (a) wedge (b) pulley (c) screw (d) lever
40. 40.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull

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