Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 261 · 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.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
2. 2.True or false: powder on a carrom board gives less friction. (a) False (b) True
3. 3.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
4. 4.🏋️ A force of 360 N did 360 J of work. How many metres did the object move?
5. 5.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
6. 6.Which of these is caused by magnetic force? (a) lifting a school bag (b) a compass needle turns (c) shoes grip the floor (d) an apple falls down
7. 7.Which of these is a lever? (a) a flagpole rope wheel (b) a round doorknob (c) a window blind cord (d) a nutcracker
8. 8.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
9. 9.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a screw jack (d) a window blind cord
11. 11.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
12. 12.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
15. 15.⚙️ 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
16. 16.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
19. 19.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
20. 20.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.🏋️ A force of 370 N pushes a cart 9 m along the floor. How much work is done, in joules?
23. 23.💪 Two children push a box to the right, one with 50 N and the other with 65 N. What is the net (total) force on the box, in newtons?
24. 24.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
25. 25.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 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. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
27. 27.🏋️ A force of 140 N pushes a cart 2 m along the floor. How much work is done, in joules?
28. 28.⚖️ A seesaw balances. Asha (380 N) sits 3 m from the pivot on one side; Meena (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
29. 29.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
30. 30.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
31. 31.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
33. 33.⚖️ A lever bar balances. The load is 350 N at 40 cm from the fulcrum. The effort is 280 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.True or false: a fixed pulley halves the effort. (a) True (b) False
35. 35.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
36. 36.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) without moving it (d) very slowly
37. 37.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
38. 38.True or false: a crowbar is a lever. (a) True (b) False
39. 39.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle

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