Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 837 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
3. 3.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
4. 4.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
5. 5.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
6. 6.True or false: pulling up your socks is a pull. (a) False (b) True
7. 7.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.🏋️ A force of 250 N did 500 J of work. How many metres did the object move?
9. 9.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
10. 10.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 3 (c) class 1
11. 11.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
12. 12.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) pulley (c) inclined plane (d) lever
13. 13.💪 Two children push a box to the right, one with 35 N and the other with 60 N. What is the net (total) force on the box, in newtons?
14. 14.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
15. 15.True or false: a claw hammer on a nail is a wedge. (a) False (b) True
16. 16.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a bar on a pivot (d) a rope on a wheel
17. 17.🪝 A bucket weighing 330 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.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
19. 19.⚖️ A seesaw balances. Meena (360 N) sits 2 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) inclined plane (c) screw (d) lever
21. 21.True or false: sand on a slippery path gives more friction. (a) True (b) False
22. 22.⚖️ A seesaw balances. Arjun (480 N) sits 2 m from the pivot on one side; Kabir (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.True or false: a steering wheel is a wheel and axle. (a) False (b) True
24. 24.True or false: a movable pulley halves the effort. (a) False (b) True
25. 25.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
26. 26.⚖️ A seesaw balances. Zoya (300 N) sits ? m from the pivot on one side; Kabir (200 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ A seesaw balances. Asha (300 N) sits 4 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?
28. 28.True or false: a chisel is a wedge. (a) False (b) True
29. 29.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
32. 32.🏋️ A force of 370 N pushes a cart 6 m along the floor. How much work is done, in joules?
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
34. 34.💪 Two children push a box to the right, one with 15 N and the other with 100 N. What is the net (total) force on the box, in newtons?
35. 35.🪝 A load of 520 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.🏋️ Pushing a crate 10 m took 3900 J of work. What force was used, in newtons?
37. 37.🏋️ A force of 220 N did 2200 J of work. How many metres did the object move?
38. 38.True or false: powder on a carrom board gives more friction. (a) True (b) False
39. 39.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
40. 40.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) True (b) False

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