Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 424 · 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.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Meena (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
3. 3.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
4. 4.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
5. 5.⚖️ A seesaw balances. Kabir (400 N) sits 2 m from the pivot on one side; Zoya (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
7. 7.💪 A bag has a mass of 4 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
8. 8.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
9. 9.True or false: hitting a cricket ball is a push. (a) True (b) False
10. 10.🪝 A bucket weighing 280 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.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Arjun (450 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚙️ Which simple machine is a bottle cap? (a) lever (b) inclined plane (c) screw (d) wedge
14. 14.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
16. 16.🔍 Which is the odd one out? (a) a seesaw (b) a bottle opener (c) a nutcracker (d) a round doorknob
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
18. 18.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
21. 21.⚖️ A seesaw balances. Ravi (360 N) sits ? m from the pivot on one side; Asha (240 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
23. 23.⚙️ Which simple machine is a wheelchair ramp? (a) lever (b) wedge (c) screw (d) inclined plane
24. 24.⚖️ A lever bar balances. The load is 30 N at ? cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
26. 26.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
27. 27.💪 Two children push a box to the right, one with 5 N and the other with 85 N. What is the net (total) force on the box, in newtons?
28. 28.🏋️ Pushing a crate 1 m took 400 J of work. What force was used, in newtons?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.Which of these is caused by gravity? (a) a rolling ball slows (b) an apple falls down (c) shoes grip the floor (d) rubbing hands warms them
31. 31.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
32. 32.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
34. 34.True or false: a jar lid is a screw. (a) True (b) False
35. 35.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
36. 36.⚙️ Which simple machine is a chisel? (a) inclined plane (b) wedge (c) lever (d) screw
37. 37.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
38. 38.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
40. 40.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3

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