Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 171 · 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 320 N at ? cm from the fulcrum. The effort is 400 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🏋️ A force of 230 N pushes a cart 4 m along the floor. How much work is done, in joules?
4. 4.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
5. 5.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
6. 6.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
7. 7.⚖️ A seesaw balances. Arjun (400 N) sits 4 m from the pivot on one side; Kabir (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
8. 8.Which of these is a wedge? (a) a flagpole rope wheel (b) a door stopper (c) a bottle opener (d) a window blind cord
9. 9.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) screw (c) pulley (d) inclined plane
10. 10.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
12. 12.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
13. 13.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
14. 14.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
18. 18.⚙️ Which simple machine is a well winch handle? (a) pulley (b) lever (c) wheel and axle (d) inclined plane
19. 19.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
20. 20.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
22. 22.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
23. 23.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) switch off gravity (d) use a smaller force
24. 24.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
26. 26.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
27. 27.Which of these is caused by gravity? (a) lifting a school bag (b) shoes grip the floor (c) a rolling ball slows (d) an apple falls down
28. 28.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
29. 29.⚖️ A seesaw balances. Arjun (360 N) sits 2 m from the pivot on one side; Zoya (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its shape (d) change its colour
32. 32.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.True or false: a round doorknob is an inclined plane. (a) True (b) False
35. 35.True or false: pushing a swing is a pull. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
37. 37.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 150 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.💪 Is a tug of war a push or a pull? (a) a push (b) a pull

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