Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 217 · 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 force of 70 N did 700 J of work. How many metres did the object move?
2. 2.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
3. 3.🏋️ A force of 470 N pushes a cart 4 m along the floor. How much work is done, in joules?
4. 4.⚖️ A seesaw balances. Asha (390 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
6. 6.⚖️ A lever bar balances. The load is 480 N at 50 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?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
8. 8.⚖️ A lever bar balances. The load is 240 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.💪 A box weighs 460 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
10. 10.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
11. 11.True or false: a fixed pulley only changes direction. (a) True (b) False
12. 12.⚙️ 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
13. 13.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
14. 14.True or false: a box pushed on carpet gives more friction. (a) False (b) True
15. 15.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
17. 17.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
19. 19.💪 Which force is at work: an apple falls down? (a) muscular force (b) magnetic force (c) friction (d) gravity
20. 20.⚖️ A seesaw balances. Zoya (240 N) sits 2 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?
21. 21.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.⚖️ A seesaw balances. Ravi (300 N) sits ? m from the pivot on one side; Asha (450 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
23. 23.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 80 N. What is the size of the net force, in newtons?
24. 24.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
25. 25.💪 A cart is pulled to the right with 65 N and to the left with 65 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
26. 26.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
27. 27.True or false: a jar lid is a lever. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) a nutcracker (b) a bottle opener (c) the tip of a nail (d) a crowbar
29. 29.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
30. 30.🏋️ A force of 200 N pushes a cart 10 m along the floor. How much work is done, in joules?
31. 31.🏋️ A force of 30 N pushes a cart 4 m along the floor. How much work is done, in joules?
32. 32.⚖️ A seesaw balances. Zoya (540 N) sits ? m from the pivot on one side; Arjun (180 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
33. 33.Which of these is caused by magnetic force? (a) lifting a school bag (b) shoes grip the floor (c) a river flows downhill (d) a magnet picks up pins
34. 34.💪 In a tug of war, one team pulls right with 75 N and the other pulls left with 55 N. What is the size of the net force, in newtons?
35. 35.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
36. 36.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
37. 37.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
38. 38.True or false: pulling a cart is a pull. (a) True (b) False
39. 39.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
40. 40.⚖️ A seesaw balances. Arjun (400 N) sits ? m from the pivot on one side; Kabir (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?

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