Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 948 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
2. 2.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
3. 3.True or false: a grippy rubber sole gives less friction. (a) False (b) True
4. 4.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Zoya (330 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.💪 Two children push a box to the right, one with 55 N and the other with 100 N. What is the net (total) force on the box, in newtons?
7. 7.💪 Which force is at work: a river flows downhill? (a) gravity (b) friction (c) magnetic force (d) muscular force
8. 8.💪 A cart is pulled to the right with 20 N and to the left with 35 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
9. 9.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
10. 10.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
11. 11.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
12. 12.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
13. 13.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
14. 14.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
15. 15.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
16. 16.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
18. 18.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Arjun (150 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ A seesaw balances. Zoya (800 N) sits 2 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
21. 21.True or false: pushing a trolley is a pull. (a) True (b) False
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚙️ Which simple machine is a playground slide? (a) pulley (b) inclined plane (c) wedge (d) wheel and axle
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
26. 26.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
27. 27.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) without moving it (d) very slowly
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
29. 29.True or false: a tug of war is a pull. (a) False (b) True
30. 30.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
31. 31.True or false: a water tap handle is a pulley. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
33. 33.Which of these is caused by friction? (a) a thrown ball comes down (b) shoes grip the floor (c) a fridge magnet sticks (d) an apple falls down
34. 34.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
35. 35.True or false: a smooth steel slide gives less friction. (a) True (b) False
36. 36.True or false: a knife edge is a wheel and axle. (a) False (b) True
37. 37.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
38. 38.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Meena (220 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
40. 40.True or false: the tip of a nail is an inclined plane. (a) True (b) False

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