Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 329 · 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.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
2. 2.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
3. 3.⚖️ A seesaw balances. Ravi (480 N) sits ? m from the pivot on one side; Asha (480 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
4. 4.🏋️ A force of 190 N pushes a cart 10 m along the floor. How much work is done, in joules?
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
7. 7.True or false: closing a drawer is a pull. (a) True (b) False
8. 8.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
9. 9.⚖️ A lever bar balances. The load is 30 N at ? cm from the fulcrum. The effort is 30 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 90 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
13. 13.⚙️ Which simple machine is a water tap handle? (a) pulley (b) wheel and axle (c) inclined plane (d) lever
14. 14.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
15. 15.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
16. 16.⚖️ A lever bar balances. The load is 720 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
19. 19.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
20. 20.⚙️ Which simple machine is the tip of a nail? (a) lever (b) wheel and axle (c) wedge (d) pulley
21. 21.⚖️ A lever bar balances. The load is 350 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?
22. 22.True or false: a fixed pulley only changes direction. (a) False (b) True
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🏋️ A force of 100 N pushes a cart 8 m along the floor. How much work is done, in joules?
25. 25.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
26. 26.💪 Two children push a box to the right, one with 30 N and the other with 65 N. What is the net (total) force on the box, in newtons?
27. 27.⚖️ A seesaw balances. Asha (170 N) sits 2 m from the pivot on one side; Zoya (340 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
28. 28.Which of these is a lever? (a) a seesaw (b) a chisel (c) an axe blade (d) a crane hook block
29. 29.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
31. 31.🏋️ A force of 330 N pushes a cart 6 m along the floor. How much work is done, in joules?
32. 32.💪 A bag has a mass of 9 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) metre (m) (d) newton (N)
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.Which of these is caused by muscular force? (a) a thrown ball comes down (b) a magnet picks up pins (c) shoes grip the floor (d) squeezing a lemon
37. 37.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
38. 38.⚖️ A seesaw balances. Zoya (150 N) sits 2 m from the pivot on one side; Asha (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank

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