Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 263 · 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.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
2. 2.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) use a smaller force (d) stop all friction
3. 3.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
4. 4.⚖️ A seesaw balances. Meena (720 N) sits 2 m from the pivot on one side; Arjun (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
6. 6.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) gravity (d) friction
7. 7.True or false: a well-bucket rope wheel is an inclined plane. (a) True (b) False
8. 8.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
9. 9.⚖️ A lever bar balances. The load is 80 N at 40 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
11. 11.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
12. 12.🏋️ A force of 470 N pushes a cart 5 m along the floor. How much work is done, in joules?
13. 13.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
14. 14.⚖️ A seesaw balances. Zoya (640 N) sits 3 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
16. 16.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a box pushed on carpet (d) a smooth steel slide
17. 17.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) friction (c) gravity (d) magnetic force
18. 18.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
19. 19.Which of these is caused by magnetic force? (a) pedalling a cycle (b) a fridge magnet sticks (c) an apple falls down (d) a river flows downhill
20. 20.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
23. 23.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) metre (m) (d) second (s)
24. 24.💪 A cart is pulled to the right with 100 N and to the left with 95 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
25. 25.🏋️ A force of 30 N pushes a cart 2 m along the floor. How much work is done, in joules?
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a smooth steel slide (d) skating on ice
27. 27.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🏋️ A force of 180 N did 720 J of work. How many metres did the object move?
30. 30.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
31. 31.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) friction (c) muscular force (d) gravity
32. 32.🔍 Which is the odd one out? (a) a round doorknob (b) a crowbar (c) a well winch handle (d) a steering wheel
33. 33.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.🪝 A load of 760 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
35. 35.⚖️ A seesaw balances. Asha (240 N) sits ? m from the pivot on one side; Meena (240 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
37. 37.⚙️ Which simple machine is a playground slide? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
38. 38.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
40. 40.True or false: a rough doormat gives less friction. (a) False (b) True

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