Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 637 · 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.🏋️ Pushing a crate 5 m took 800 J of work. What force was used, in newtons?
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
3. 3.Which of these is a wheel and axle? (a) a flagpole rope wheel (b) a truck loading ramp (c) a jar lid (d) a water tap handle
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
5. 5.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.True or false: a jar lid is a screw. (a) False (b) True
8. 8.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
9. 9.💪 Two children push a box to the right, one with 75 N and the other with 35 N. What is the net (total) force on the box, in newtons?
10. 10.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
11. 11.⚖️ A seesaw balances. Zoya (720 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🏋️ A force of 100 N did 900 J of work. How many metres did the object move?
13. 13.🏋️ A force of 330 N did 1320 J of work. How many metres did the object move?
14. 14.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a magnet picks up pins (c) rubbing hands warms them (d) an apple falls down
15. 15.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
16. 16.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 60 N. What is the size of the net force, in newtons?
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
19. 19.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) doubled (d) gravity
20. 20.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
21. 21.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
22. 22.⚖️ A seesaw balances. Arjun (400 N) sits 2 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.True or false: a crowbar is a wheel and axle. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
25. 25.True or false: skating on ice gives less friction. (a) True (b) False
26. 26.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
27. 27.True or false: a wood screw is a lever. (a) False (b) True
28. 28.True or false: a movable pulley halves the effort. (a) True (b) False
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) nothing (d) the load
30. 30.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
31. 31.Which of these is caused by friction? (a) a magnet picks up pins (b) rain falls to the ground (c) a rolling ball slows (d) a thrown ball comes down
32. 32.⚖️ A seesaw balances. Meena (150 N) sits 2 m from the pivot on one side; Asha (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚙️ Which simple machine is a road up a hill? (a) screw (b) inclined plane (c) lever (d) pulley
34. 34.True or false: pushing a swing is a push. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a rough doormat (d) a wet tiled floor
36. 36.True or false: plucking a mango is a pull. (a) False (b) True
37. 37.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
38. 38.🏋️ A force of 270 N did 2700 J of work. How many metres did the object move?
39. 39.🏋️ A force of 290 N pushes a cart 4 m along the floor. How much work is done, in joules?
40. 40.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) muscular force (c) gravity (d) friction

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