Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 243 · 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 lever bar balances. The load is 720 N at 40 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
3. 3.⚙️ Which simple machine is a seesaw? (a) inclined plane (b) lever (c) wedge (d) screw
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
5. 5.🏋️ A force of 380 N pushes a cart 4 m along the floor. How much work is done, in joules?
6. 6.True or false: a nutcracker is a lever. (a) True (b) False
7. 7.Which of these is an inclined plane? (a) a knife edge (b) a nutcracker (c) a flagpole rope wheel (d) a wheelchair ramp
8. 8.🪝 A load of 880 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.⚖️ A lever bar balances. The load is 560 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.🏋️ A force of 250 N pushes a cart 4 m along the floor. How much work is done, in joules?
11. 11.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
13. 13.⚖️ A seesaw balances. Ravi (240 N) sits ? m from the pivot on one side; Arjun (360 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
14. 14.True or false: a fixed pulley rises with the load. (a) True (b) False
15. 15.🏋️ Pushing a crate 8 m took 1360 J of work. What force was used, in newtons?
16. 16.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Ravi (150 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🪝 A bucket weighing 80 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
18. 18.True or false: a rough doormat gives less friction. (a) False (b) True
19. 19.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.⚖️ A lever bar balances. The load is 250 N at 50 cm from the fulcrum. The effort is 250 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.⚖️ A lever bar balances. The load is 270 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) litre (L) (d) newton (N)
23. 23.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) switch off gravity (d) make new energy
24. 24.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
27. 27.True or false: a well winch handle is a wheel and axle. (a) True (b) False
28. 28.Which of these is caused by friction? (a) an apple falls down (b) a river flows downhill (c) lifting a school bag (d) a rolling ball slows
29. 29.💪 A cart is pulled to the right with 45 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
30. 30.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) a wet tiled floor
32. 32.True or false: a movable pulley stays in one place. (a) True (b) False
33. 33.Which of these is caused by gravity? (a) rubbing hands warms them (b) squeezing a lemon (c) an apple falls down (d) a fridge magnet sticks
34. 34.True or false: a rough doormat gives more friction. (a) False (b) True
35. 35.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
38. 38.🪝 A load of 280 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.💪 A cart is pulled to the right with 20 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
40. 40.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly

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