Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 87 · 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 force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?
2. 2.🏋️ Pushing a crate 2 m took 300 J of work. What force was used, in newtons?
3. 3.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) gravity (d) muscular force
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
5. 5.🏋️ Pushing a crate 7 m took 560 J of work. What force was used, in newtons?
6. 6.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
7. 7.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
8. 8.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
9. 9.Which of these is caused by friction? (a) an apple falls down (b) a river flows downhill (c) shoes grip the floor (d) a thrown ball comes down
10. 10.⚖️ A seesaw balances. Meena (240 N) sits 1 m from the pivot on one side; Asha (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
12. 12.⚖️ A lever bar balances. The load is 360 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.⚙️ Which simple machine is a truck loading ramp? (a) wheel and axle (b) inclined plane (c) wedge (d) pulley
14. 14.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
15. 15.⚙️ A wedge is … (a) two ramps back to back (b) a rope on a wheel (c) a wheel on a rod (d) a bar on a pivot
16. 16.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.💪 Two children push a box to the right, one with 30 N and the other with 45 N. What is the net (total) force on the box, in newtons?
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a smooth steel slide (d) sand on a slippery path
20. 20.🏋️ A force of 40 N pushes a cart 8 m along the floor. How much work is done, in joules?
21. 21.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.⚖️ A lever bar balances. The load is 100 N at 30 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?
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 5 N, a carpet 7 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
24. 24.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
26. 26.Which of these is caused by gravity? (a) a magnet picks up pins (b) a rolling ball slows (c) shoes grip the floor (d) an apple falls down
27. 27.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
31. 31.🏋️ Pushing a crate 4 m took 1600 J of work. What force was used, in newtons?
32. 32.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Asha (130 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ A seesaw balances. Meena (420 N) sits 2 m from the pivot on one side; Arjun (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
34. 34.True or false: plucking a mango is a pull. (a) False (b) True
35. 35.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) skating on ice (d) a rough doormat
37. 37.True or false: a movable pulley stays in one place. (a) True (b) False
38. 38.⚖️ 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?
39. 39.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
40. 40.💪 A bag has a mass of 6 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?

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