Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 506 · 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 grippy rubber sole gives less friction. (a) True (b) False
2. 2.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.🏋️ Pushing a crate 5 m took 1850 J of work. What force was used, in newtons?
4. 4.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.💪 Which force is at work: lifting a school bag? (a) muscular force (b) gravity (c) magnetic force (d) friction
6. 6.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
8. 8.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a rope on a wheel (d) a wheel on a rod
9. 9.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
11. 11.True or false: a nut and bolt is a lever. (a) False (b) True
12. 12.⚖️ A seesaw balances. Asha (200 N) sits 2 m from the pivot on one side; Arjun (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
13. 13.⚖️ A seesaw balances. Ravi (140 N) sits 4 m from the pivot on one side; Asha (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.True or false: a seesaw is a wedge. (a) False (b) True
19. 19.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ A lever bar balances. The load is 480 N at 40 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?
21. 21.⚖️ A seesaw balances. Kabir (380 N) sits ? m from the pivot on one side; Asha (380 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
22. 22.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
23. 23.Which of these is caused by muscular force? (a) a river flows downhill (b) squeezing a lemon (c) a magnet picks up pins (d) brakes stop a bicycle
24. 24.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
25. 25.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
26. 26.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.⚖️ A lever bar balances. The load is 500 N at ? cm from the fulcrum. The effort is 150 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.Which of these is caused by muscular force? (a) shoes grip the floor (b) a fridge magnet sticks (c) lifting a school bag (d) a thrown ball comes down
29. 29.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
31. 31.True or false: a movable pulley stays in one place. (a) True (b) False
32. 32.Which of these is caused by gravity? (a) shoes grip the floor (b) rain falls to the ground (c) lifting a school bag (d) rubbing hands warms them
33. 33.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
34. 34.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) unbalanced (d) balanced
35. 35.True or false: plucking a mango is a push. (a) True (b) False
36. 36.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
37. 37.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
39. 39.💪 A box weighs 450 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
40. 40.True or false: skating on ice gives more friction. (a) False (b) True

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