Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 94 · 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.💪 Which force is at work: a rolling ball slows? (a) gravity (b) magnetic force (c) muscular force (d) friction
2. 2.🪝 A bucket weighing 140 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.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
4. 4.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) two ramps back to back (d) a wheel on a rod
5. 5.💪 Which force is at work: a compass needle turns? (a) gravity (b) magnetic force (c) muscular force (d) friction
6. 6.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Ravi (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) sand on a slippery path (d) a grippy rubber sole
9. 9.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
10. 10.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
12. 12.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
14. 14.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
15. 15.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
16. 16.🏋️ Pushing a crate 2 m took 420 J of work. What force was used, in newtons?
17. 17.🪝 A load of 240 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.🪝 A well winch has a handle (wheel) of radius 5 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a rough doormat
20. 20.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.True or false: drawing up a well bucket is a pull. (a) True (b) False
22. 22.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
23. 23.Which of these is a pulley? (a) a nutcracker (b) the tip of a nail (c) a wheelchair ramp (d) a crane hook block
24. 24.True or false: pulling a cart is a push. (a) False (b) True
25. 25.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
26. 26.Which of these is a wheel and axle? (a) a round doorknob (b) a knife edge (c) a bottle opener (d) an axe blade
27. 27.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
28. 28.True or false: hitting a cricket ball is a pull. (a) False (b) True
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) make new energy (d) use a smaller force
32. 32.💪 Which force is at work: lifting a school bag? (a) gravity (b) muscular force (c) friction (d) magnetic force
33. 33.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) powder on a carrom board (d) chalk on a gym bar
35. 35.⚙️ Which simple machine is a screw jack? (a) wedge (b) wheel and axle (c) screw (d) pulley
36. 36.⚖️ A seesaw balances. Asha (200 N) sits 3 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.Which of these is caused by magnetic force? (a) an apple falls down (b) rubbing hands warms them (c) a magnet picks up pins (d) a rolling ball slows
38. 38.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
39. 39.🪝 A load of 140 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.🏋️ A force of 90 N did 810 J of work. How many metres did the object move?

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