Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 492 · 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.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
2. 2.True or false: a fixed pulley only changes direction. (a) False (b) True
3. 3.⚖️ A seesaw balances. Asha (480 N) sits 4 m from the pivot on one side; Meena (640 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
5. 5.🏋️ A force of 20 N pushes a cart 9 m along the floor. How much work is done, in joules?
6. 6.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
10. 10.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
12. 12.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
13. 13.🏋️ A force of 380 N pushes a cart 3 m along the floor. How much work is done, in joules?
14. 14.⚖️ A lever bar balances. The load is 810 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
16. 16.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 250 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
18. 18.💪 A cart is pulled to the right with 90 N and to the left with 85 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
19. 19.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) gravity (c) muscular force (d) friction
20. 20.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
21. 21.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
22. 22.⚖️ A seesaw balances. Kabir (380 N) sits 1 m from the pivot on one side; Meena (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
24. 24.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) magnetism (d) friction
25. 25.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
26. 26.💪 Which force is at work: shoes grip the floor? (a) gravity (b) muscular force (c) friction (d) magnetic force
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) sand on a slippery path (d) powder on a carrom board
29. 29.⚙️ Which simple machine is the tip of a nail? (a) wedge (b) lever (c) screw (d) inclined plane
30. 30.True or false: a movable pulley halves the effort. (a) True (b) False
31. 31.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
32. 32.💪 Which force is at work: a compass needle turns? (a) magnetic force (b) muscular force (c) friction (d) gravity
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.True or false: plucking a mango is a push. (a) False (b) True
36. 36.Which of these is a wheel and axle? (a) a seesaw (b) a well winch handle (c) a claw hammer on a nail (d) a bottle opener
37. 37.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
38. 38.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
39. 39.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
40. 40.True or false: pulling up your socks is a pull. (a) True (b) False

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