Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 697 · 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 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
3. 3.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) friction (c) gravity (d) muscular force
4. 4.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 120 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.Which of these is a lever? (a) a round doorknob (b) a crowbar (c) a door stopper (d) a wood screw
6. 6.⚖️ A seesaw balances. Zoya (220 N) sits ? m from the pivot on one side; Asha (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
8. 8.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: a bottle opener is a lever. (a) True (b) False
10. 10.⚖️ A seesaw balances. Meena (150 N) sits 4 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.💪 A bag has a mass of 30 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
12. 12.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
13. 13.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
14. 14.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
18. 18.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
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 60 N bucket on the axle, in newtons? (ideal)
20. 20.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
21. 21.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
22. 22.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (160 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.True or false: pulling a cart is a push. (a) False (b) True
24. 24.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
25. 25.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
27. 27.⚖️ A seesaw balances. Meena (220 N) sits ? m from the pivot on one side; Ravi (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
28. 28.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
29. 29.True or false: closing a drawer is a pull. (a) True (b) False
30. 30.💪 A box weighs 40 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
33. 33.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
34. 34.⚖️ A seesaw balances. Arjun (330 N) sits 4 m from the pivot on one side; Asha (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.True or false: sand on a slippery path gives more friction. (a) False (b) True
38. 38.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) muscular force (c) gravity (d) friction
39. 39.True or false: kicking a football is a pull. (a) False (b) True
40. 40.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short

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