Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 291 · 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 lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
2. 2.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.True or false: pressing a doorbell is a pull. (a) False (b) True
5. 5.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
6. 6.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (260 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.Which of these is caused by friction? (a) shoes grip the floor (b) squeezing a lemon (c) lifting a school bag (d) pedalling a cycle
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
9. 9.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) screw (c) lever (d) inclined plane
10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
11. 11.🪝 A pulley system lifts a 720 N load with an effort of 240 N. What is its mechanical advantage (MA)?
12. 12.Which of these is a pulley? (a) a steering wheel (b) a flagpole rope wheel (c) a truck loading ramp (d) a door stopper
13. 13.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
14. 14.Which of these is caused by muscular force? (a) a rolling ball slows (b) squeezing a lemon (c) a river flows downhill (d) a magnet picks up pins
15. 15.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
16. 16.True or false: a movable pulley only changes direction. (a) False (b) True
17. 17.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
18. 18.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
19. 19.Which of these is caused by gravity? (a) pedalling a cycle (b) brakes stop a bicycle (c) a thrown ball comes down (d) shoes grip the floor
20. 20.True or false: a fixed pulley halves the effort. (a) True (b) False
21. 21.🏋️ A force of 110 N did 440 J of work. How many metres did the object move?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
23. 23.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
24. 24.True or false: drawing up a well bucket is a pull. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
26. 26.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
27. 27.True or false: a crowbar is a lever. (a) False (b) True
28. 28.💪 A box weighs 390 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
30. 30.💪 A box weighs 260 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.Which of these is caused by friction? (a) a fridge magnet sticks (b) a river flows downhill (c) rain falls to the ground (d) brakes stop a bicycle
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
33. 33.⚖️ A seesaw balances. Ravi (110 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?
34. 34.⚖️ A seesaw balances. Arjun (560 N) sits ? m from the pivot on one side; Zoya (280 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
35. 35.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
36. 36.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.True or false: a movable pulley stays in one place. (a) True (b) False
38. 38.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
39. 39.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
40. 40.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed

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