Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 755 · 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 movable pulley only changes direction. (a) True (b) False
2. 2.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🏋️ A force of 410 N did 1230 J of work. How many metres did the object move?
4. 4.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
5. 5.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) gravity (d) friction
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.💪 A force is a … (a) push or a pull (b) unit of time (c) kind of colour (d) type of sound
8. 8.⚙️ Which simple machine is a jar lid? (a) lever (b) screw (c) wedge (d) pulley
9. 9.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
10. 10.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
13. 13.🪝 A pulley system lifts a 720 N load with an effort of 180 N. What is its mechanical advantage (MA)?
14. 14.⚙️ Which simple machine is a well-bucket rope wheel? (a) wedge (b) lever (c) screw (d) pulley
15. 15.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
16. 16.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
17. 17.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
18. 18.True or false: a tyre with deep treads gives less friction. (a) False (b) True
19. 19.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Arjun (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
22. 22.⚖️ A lever bar balances. The load is 360 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.💪 Which force is at work: shoes grip the floor? (a) friction (b) muscular force (c) magnetic force (d) gravity
24. 24.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
25. 25.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
26. 26.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
27. 27.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
28. 28.🏋️ A force of 340 N pushes a cart 6 m along the floor. How much work is done, in joules?
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
30. 30.Which of these is a lever? (a) a water tap handle (b) a flagpole rope wheel (c) a bottle opener (d) a nut and bolt
31. 31.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.🏋️ A force of 40 N pushes a cart 7 m along the floor. How much work is done, in joules?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
34. 34.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
35. 35.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
36. 36.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
37. 37.⚖️ A lever bar balances. The load is 810 N at 20 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.Which of these is caused by gravity? (a) shoes grip the floor (b) brakes stop a bicycle (c) rubbing hands warms them (d) a river flows downhill
39. 39.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)

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