Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 635 · 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.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (100 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
3. 3.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
4. 4.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
6. 6.💪 Which force is at work: pedalling a cycle? (a) friction (b) magnetic force (c) gravity (d) muscular force
7. 7.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
8. 8.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
9. 9.Which of these is caused by muscular force? (a) rubbing hands warms them (b) a rolling ball slows (c) lifting a school bag (d) a compass needle turns
10. 10.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
11. 11.🔍 Which is the odd one out? (a) a round doorknob (b) a steering wheel (c) a water tap handle (d) a jar lid
12. 12.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
13. 13.⚖️ 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?
14. 14.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the fulcrum (d) the effort
15. 15.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
16. 16.Which of these is a wheel and axle? (a) a window blind cord (b) a round doorknob (c) a knife edge (d) a crowbar
17. 17.⚖️ 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?
18. 18.🏋️ 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
19. 19.💪 Two children push a box to the right, one with 70 N and the other with 80 N. What is the net (total) force on the box, in newtons?
20. 20.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
21. 21.True or false: a movable pulley is on a flagpole top. (a) False (b) True
22. 22.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
24. 24.⚖️ A lever bar balances. The load is 280 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
26. 26.True or false: kicking a football is a push. (a) False (b) True
27. 27.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
28. 28.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 300 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🏋️ A force of 90 N pushes a cart 9 m along the floor. How much work is done, in joules?
30. 30.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
31. 31.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
32. 32.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.True or false: pushing a swing is a pull. (a) True (b) False
34. 34.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
35. 35.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a smooth steel slide
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a grippy rubber sole (d) a box pushed on carpet
38. 38.🔍 Which is the odd one out? (a) a bottle opener (b) a water tap handle (c) a well winch handle (d) a steering wheel
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the rock (d) on the fulcrum

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