Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 800 · 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 350 N at 10 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?
2. 2.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
4. 4.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
5. 5.Which of these is caused by magnetic force? (a) pedalling a cycle (b) squeezing a lemon (c) a fridge magnet sticks (d) lifting a school bag
6. 6.⚖️ A seesaw balances. Meena (320 N) sits ? m from the pivot on one side; Ravi (480 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
7. 7.⚙️ Which simple machine is a round doorknob? (a) wedge (b) lever (c) wheel and axle (d) pulley
8. 8.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
9. 9.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
10. 10.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
11. 11.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
12. 12.⚖️ A seesaw balances. Asha (680 N) sits 2 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.True or false: a fixed pulley rises with the load. (a) False (b) True
14. 14.⚙️ Which simple machine is a screw jack? (a) inclined plane (b) lever (c) screw (d) wheel and axle
15. 15.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) second (s) (d) metre (m)
16. 16.💪 Which force is at work: rain falls to the ground? (a) friction (b) gravity (c) muscular force (d) magnetic force
17. 17.⚖️ A lever bar balances. The load is 630 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
19. 19.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
20. 20.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
23. 23.⚙️ Which simple machine is an axe blade? (a) lever (b) pulley (c) inclined plane (d) wedge
24. 24.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
25. 25.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
26. 26.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) more effort needed (d) no change
27. 27.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the load (d) the effort
28. 28.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
29. 29.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
31. 31.⚖️ A seesaw balances. Ravi (760 N) sits 2 m from the pivot on one side; Meena (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.⚙️ Which simple machine is a road up a hill? (a) pulley (b) screw (c) inclined plane (d) wheel and axle
34. 34.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
36. 36.True or false: pushing a trolley is a pull. (a) True (b) False
37. 37.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
38. 38.⚖️ A seesaw balances. Zoya (110 N) sits 4 m from the pivot on one side; Ravi (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) friction (c) muscular force (d) magnetic force
40. 40.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)

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