Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 842 · 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 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🏋️ A force of 40 N pushes a cart 3 m along the floor. How much work is done, in joules?
4. 4.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
5. 5.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
6. 6.Which of these is caused by friction? (a) rubbing hands warms them (b) an apple falls down (c) a fridge magnet sticks (d) a magnet picks up pins
7. 7.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 6 (c) 10 (d) 12
8. 8.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
9. 9.True or false: a wheelchair ramp is an inclined plane. (a) False (b) True
10. 10.🏋️ A force of 280 N did 2520 J of work. How many metres did the object move?
11. 11.Which of these is a pulley? (a) a road up a hill (b) a crowbar (c) a flagpole rope wheel (d) a steering wheel
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
13. 13.⚙️ Which simple machine is a window blind cord? (a) screw (b) inclined plane (c) wheel and axle (d) pulley
14. 14.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) more effort needed (d) no change
15. 15.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) magnetic force (d) friction
16. 16.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
17. 17.True or false: powder on a carrom board gives less friction. (a) False (b) True
18. 18.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
19. 19.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
20. 20.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) False (b) True
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
22. 22.True or false: a bottle opener is a wheel and axle. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
24. 24.True or false: a truck loading ramp is a lever. (a) True (b) False
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) wedge (c) screw (d) pulley
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
30. 30.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
31. 31.💪 In which unit do we measure force? (a) newton (N) (b) metre (m) (c) second (s) (d) litre (L)
32. 32.⚖️ A seesaw balances. Kabir (330 N) sits 1 m from the pivot on one side; Zoya (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
34. 34.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
35. 35.True or false: a box pushed on carpet gives more friction. (a) True (b) False
36. 36.⚖️ A lever bar balances. The load is 600 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.True or false: hitting a cricket ball is a pull. (a) True (b) False
40. 40.⚖️ A seesaw balances. Kabir (120 N) sits ? m from the pivot on one side; Meena (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?

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