Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 412 · 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.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
2. 2.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🏋️ Pushing a crate 5 m took 750 J of work. What force was used, in newtons?
4. 4.🏋️ A force of 290 N pushes a cart 3 m along the floor. How much work is done, in joules?
5. 5.💪 Which force is at work: pedalling a cycle? (a) friction (b) gravity (c) magnetic force (d) muscular force
6. 6.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
7. 7.💪 A bag has a mass of 59 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
8. 8.True or false: a chisel is a wedge. (a) True (b) False
9. 9.True or false: powder on a carrom board gives less friction. (a) True (b) False
10. 10.⚙️ Which simple machine is a wheelchair ramp? (a) screw (b) wheel and axle (c) lever (d) inclined plane
11. 11.⚖️ A seesaw balances. Ravi (340 N) sits ? m from the pivot on one side; Arjun (340 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
12. 12.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
13. 13.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) pedalling a cycle (c) squeezing a lemon (d) shoes grip the floor
14. 14.⚙️ Which simple machine is a truck loading ramp? (a) pulley (b) lever (c) wheel and axle (d) inclined plane
15. 15.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) pulley (c) screw (d) inclined plane
16. 16.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
17. 17.🏋️ Pushing a crate 8 m took 3040 J of work. What force was used, in newtons?
18. 18.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
19. 19.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
23. 23.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a knife edge
24. 24.True or false: a jar lid is a wedge. (a) False (b) True
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
26. 26.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
28. 28.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
32. 32.🪝 A load of 80 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.⚙️ Which simple machine is the tip of a nail? (a) screw (b) wheel and axle (c) wedge (d) inclined plane
34. 34.🪝 A bucket weighing 320 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) a thrown ball comes down (c) rubbing hands warms them (d) a rolling ball slows
36. 36.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
37. 37.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
38. 38.⚖️ A lever bar balances. The load is 320 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.True or false: a fixed pulley rises with the load. (a) False (b) True
40. 40.🏋️ A force of 390 N did 2730 J of work. How many metres did the object move?

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