Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 281 · 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 lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
3. 3.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
4. 4.True or false: a fixed pulley needs effort = load. (a) True (b) False
5. 5.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
6. 6.True or false: a fixed pulley stays in one place. (a) False (b) True
7. 7.🏋️ A force of 330 N pushes a cart 7 m along the floor. How much work is done, in joules?
8. 8.🏋️ A force of 80 N did 720 J of work. How many metres did the object move?
9. 9.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
10. 10.🪝 A pulley system lifts a 450 N load with an effort of 150 N. What is its mechanical advantage (MA)?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.⚙️ Which simple machine is a nut and bolt? (a) pulley (b) inclined plane (c) screw (d) lever
14. 14.🏋️ Pushing a crate 6 m took 2220 J of work. What force was used, in newtons?
15. 15.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
16. 16.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
17. 17.True or false: a seesaw is a screw. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.True or false: a flagpole rope wheel is a pulley. (a) False (b) True
20. 20.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
21. 21.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Zoya (330 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
23. 23.True or false: the tip of a nail is a wedge. (a) False (b) True
24. 24.True or false: a wheelchair ramp is an inclined plane. (a) False (b) True
25. 25.🏋️ A force of 190 N pushes a cart 4 m along the floor. How much work is done, in joules?
26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.⚖️ A seesaw balances. Arjun (600 N) sits ? m from the pivot on one side; Ravi (400 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
29. 29.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
30. 30.🪝 A load of 320 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
31. 31.Which of these is an inclined plane? (a) a chisel (b) a road up a hill (c) the tip of a nail (d) a bottle opener
32. 32.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
33. 33.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) magnetic force (d) muscular force
34. 34.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚖️ A lever bar balances. The load is 200 N at 40 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.Which of these is a pulley? (a) a window blind cord (b) a bottle cap (c) a water tap handle (d) a door stopper
37. 37.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
38. 38.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
39. 39.True or false: sand on a slippery path gives more friction. (a) True (b) False
40. 40.🪝 A load of 120 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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