Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 307 · 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 10 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
2. 2.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
3. 3.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
4. 4.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
5. 5.True or false: hitting a cricket ball is a pull. (a) False (b) True
6. 6.⚖️ A lever bar balances. The load is 150 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
8. 8.🔍 Which is the odd one out? (a) a water tap handle (b) a wood screw (c) a jar lid (d) a screw jack
9. 9.Which of these is a wheel and axle? (a) a well-bucket rope wheel (b) a door stopper (c) a nut and bolt (d) a well winch handle
10. 10.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
12. 12.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
14. 14.True or false: a smooth steel slide gives more friction. (a) True (b) False
15. 15.True or false: pushing a trolley is a pull. (a) False (b) True
16. 16.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
17. 17.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) nothing
18. 18.True or false: a fixed pulley only changes direction. (a) False (b) True
19. 19.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
20. 20.True or false: hitting a cricket ball is a push. (a) True (b) False
21. 21.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
23. 23.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
24. 24.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
26. 26.Which of these is caused by gravity? (a) a thrown ball comes down (b) a fridge magnet sticks (c) lifting a school bag (d) pedalling a cycle
27. 27.💪 A cart is pulled to the right with 90 N and to the left with 100 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
28. 28.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
29. 29.True or false: a knife edge is a wedge. (a) False (b) True
30. 30.True or false: a box pushed on carpet gives less friction. (a) False (b) True
31. 31.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
32. 32.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
33. 33.🏋️ A force of 370 N did 1850 J of work. How many metres did the object move?
34. 34.True or false: pushing a swing is a pull. (a) True (b) False
35. 35.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.True or false: a jar lid is a screw. (a) False (b) True
37. 37.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
39. 39.⚖️ A seesaw balances. Kabir (260 N) sits 2 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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