Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 849 · 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 machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
2. 2.⚙️ Which simple machine is a well-bucket rope wheel? (a) pulley (b) lever (c) screw (d) wedge
3. 3.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (280 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
5. 5.🏋️ Pushing a crate 7 m took 1120 J of work. What force was used, in newtons?
6. 6.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
7. 7.⚖️ A lever bar balances. The load is 90 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
9. 9.True or false: pulling up your socks is a pull. (a) False (b) True
10. 10.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
11. 11.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
12. 12.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.⚖️ A seesaw balances. Asha (180 N) sits ? m from the pivot on one side; Meena (720 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
14. 14.🏋️ A force of 100 N pushes a cart 4 m along the floor. How much work is done, in joules?
15. 15.💪 Which force is at work: squeezing a lemon? (a) gravity (b) magnetic force (c) friction (d) muscular force
16. 16.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
17. 17.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
18. 18.🪝 A pulley system lifts a 570 N load with an effort of 190 N. What is its mechanical advantage (MA)?
19. 19.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
20. 20.🪝 A bucket weighing 370 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 glass sheet 6 N, a wooden plank 9 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
22. 22.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
23. 23.💪 Which force is at work: a rolling ball slows? (a) friction (b) muscular force (c) magnetic force (d) gravity
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
25. 25.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
26. 26.Which of these is caused by muscular force? (a) an apple falls down (b) a rolling ball slows (c) a magnet picks up pins (d) squeezing a lemon
27. 27.⚙️ Which simple machine is a water tap handle? (a) lever (b) inclined plane (c) wheel and axle (d) screw
28. 28.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
29. 29.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Asha (680 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
32. 32.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
33. 33.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
35. 35.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
37. 37.⚖️ A seesaw balances. Kabir (560 N) sits ? m from the pivot on one side; Zoya (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
38. 38.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
39. 39.🏋️ Pushing a crate 10 m took 1900 J of work. What force was used, in newtons?
40. 40.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?

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