Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 510 · 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.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a box pushed on carpet (d) powder on a carrom board
4. 4.Which of these is caused by muscular force? (a) a thrown ball comes down (b) lifting a school bag (c) an apple falls down (d) rain falls to the ground
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a bottle cap (d) a playground slide
8. 8.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 140 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
10. 10.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
12. 12.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) gravity (d) friction
13. 13.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
14. 14.⚖️ A seesaw balances. Ravi (260 N) sits 1 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.⚖️ A seesaw balances. Asha (420 N) sits 1 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.True or false: plucking a mango is a push. (a) False (b) True
17. 17.True or false: a grippy rubber sole gives more friction. (a) False (b) True
18. 18.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
19. 19.Which of these is caused by magnetic force? (a) a rolling ball slows (b) lifting a school bag (c) brakes stop a bicycle (d) a compass needle turns
20. 20.Which of these is a lever? (a) a round doorknob (b) a nutcracker (c) a window blind cord (d) a jar lid
21. 21.Which of these is caused by friction? (a) lifting a school bag (b) a magnet picks up pins (c) shoes grip the floor (d) rain falls to the ground
22. 22.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
23. 23.💪 A cart is pulled to the right with 50 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
24. 24.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) gravity (c) muscular force (d) friction
25. 25.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
26. 26.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
27. 27.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
28. 28.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
29. 29.Which of these is a screw? (a) a screw jack (b) a knife edge (c) a round doorknob (d) a playground slide
30. 30.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
31. 31.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
32. 32.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) on the fulcrum (d) far from the fulcrum
33. 33.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
34. 34.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (570 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
36. 36.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a chisel (c) a road up a hill (d) a truck loading ramp
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
39. 39.⚖️ A seesaw balances. Meena (510 N) sits 3 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?

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