Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 840 · 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.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
2. 2.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
3. 3.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) shoes grip the floor (c) a magnet picks up pins (d) pedalling a cycle
5. 5.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
6. 6.True or false: plucking a mango is a push. (a) False (b) True
7. 7.Which of these is an inclined plane? (a) a claw hammer on a nail (b) a nut and bolt (c) a wood screw (d) a truck loading ramp
8. 8.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
9. 9.⚖️ A lever bar balances. The load is 240 N at 10 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.True or false: a wet tiled floor gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
12. 12.⚖️ A seesaw balances. Arjun (540 N) sits ? m from the pivot on one side; Kabir (540 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🏋️ Pushing a crate 6 m took 1740 J of work. What force was used, in newtons?
14. 14.💪 In which unit do we measure force? (a) metre (m) (b) newton (N) (c) second (s) (d) litre (L)
15. 15.🏋️ A force of 380 N pushes a cart 3 m along the floor. How much work is done, in joules?
16. 16.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
17. 17.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
18. 18.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
19. 19.🔍 Which is the odd one out? (a) a playground slide (b) a truck loading ramp (c) a wheelchair ramp (d) a jar lid
20. 20.⚙️ Which simple machine is a road up a hill? (a) pulley (b) wedge (c) wheel and axle (d) inclined plane
21. 21.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
23. 23.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
24. 24.Which of these is a lever? (a) a round doorknob (b) a window blind cord (c) a seesaw (d) a well winch handle
25. 25.🏋️ Pushing a crate 4 m took 400 J of work. What force was used, in newtons?
26. 26.⚙️ Which simple machine is a knife edge? (a) lever (b) wheel and axle (c) wedge (d) pulley
27. 27.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
28. 28.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a well winch handle (c) a window blind cord (d) a flagpole rope wheel
29. 29.True or false: a tug of war is a pull. (a) True (b) False
30. 30.True or false: drawing up a well bucket is a pull. (a) False (b) True
31. 31.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
32. 32.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (260 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) magnetic force (d) muscular force
34. 34.True or false: a movable pulley needs effort = load. (a) False (b) True
35. 35.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
36. 36.🔍 Which is the odd one out? (a) a bottle opener (b) a playground slide (c) a seesaw (d) a crowbar
37. 37.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
38. 38.🏋️ 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?
39. 39.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
40. 40.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?

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