Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 203 · 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.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
3. 3.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
5. 5.🏋️ A force of 420 N did 3780 J of work. How many metres did the object move?
6. 6.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) magnetism (d) gravity
7. 7.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
8. 8.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) skating on ice (d) oil on a squeaky hinge
10. 10.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
11. 11.⚖️ A seesaw balances. Kabir (800 N) sits 1 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
13. 13.True or false: a seesaw is a class 3 lever (effort in the middle). (a) False (b) True
14. 14.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
15. 15.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
17. 17.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) lifting a school bag (c) a river flows downhill (d) an apple falls down
18. 18.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
20. 20.True or false: a tug of war is a push. (a) False (b) True
21. 21.True or false: pressing a doorbell is a pull. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
23. 23.True or false: a jar lid is a screw. (a) False (b) True
24. 24.⚖️ A seesaw balances. Asha (400 N) sits 4 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?
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.Which of these is a pulley? (a) a jar lid (b) a flagpole rope wheel (c) a bottle cap (d) a claw hammer on a nail
28. 28.💪 Two children push a box to the right, one with 80 N and the other with 5 N. What is the net (total) force on the box, in newtons?
29. 29.🔍 Which is the odd one out? (a) an axe blade (b) a chisel (c) a window blind cord (d) the tip of a nail
30. 30.💪 Two children push a box to the right, one with 95 N and the other with 80 N. What is the net (total) force on the box, in newtons?
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) gravity (c) friction (d) magnetic force
33. 33.🔍 Which is the odd one out? (a) a water tap handle (b) a bottle cap (c) a well winch handle (d) a round doorknob
34. 34.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🏋️ Pushing a crate 2 m took 760 J of work. What force was used, in newtons?
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
37. 37.💪 A force is a … (a) push or a pull (b) unit of time (c) type of sound (d) kind of colour
38. 38.True or false: opening a drawer is a push. (a) True (b) False
39. 39.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
40. 40.🏋️ A force of 470 N pushes a cart 2 m along the floor. How much work is done, in joules?

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