Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 675 · 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 fixed pulley only changes direction. (a) False (b) True
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
3. 3.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) wind (d) gravity
4. 4.⚖️ A lever bar balances. The load is 810 N at ? cm from the fulcrum. The effort is 360 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
7. 7.🏋️ Pushing a crate 10 m took 1900 J of work. What force was used, in newtons?
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 110 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
13. 13.🔍 Which is the odd one out? (a) a steering wheel (b) a round doorknob (c) a well winch handle (d) a seesaw
14. 14.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
15. 15.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
16. 16.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
17. 17.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
18. 18.🏋️ A force of 470 N did 4230 J of work. How many metres did the object move?
19. 19.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Arjun (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) lever (c) inclined plane (d) wheel and axle
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.⚖️ A lever bar balances. The load is 900 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
24. 24.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the fulcrum (d) the effort
25. 25.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a bottle cap (c) a crane hook block (d) a window blind cord
26. 26.True or false: a box pushed on carpet gives more friction. (a) True (b) False
27. 27.💪 A bag has a mass of 15 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
28. 28.💪 A cart is pulled to the right with 95 N and to the left with 80 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
30. 30.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
31. 31.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
32. 32.🏋️ A force of 360 N pushes a cart 5 m along the floor. How much work is done, in joules?
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a rough doormat (d) oil on a squeaky hinge
34. 34.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
35. 35.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
36. 36.⚖️ A seesaw balances. Asha (380 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?
37. 37.🏋️ A force of 240 N pushes a cart 3 m along the floor. How much work is done, in joules?
38. 38.⚖️ A seesaw balances. Ravi (300 N) sits 1 m from the pivot on one side; Zoya (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.Which of these is caused by friction? (a) shoes grip the floor (b) a river flows downhill (c) a magnet picks up pins (d) an apple falls down
40. 40.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) the same effort (d) more effort

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