Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 672 · 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.🔍 Which is the odd one out? (a) a steering wheel (b) a well winch handle (c) a screw jack (d) a water tap handle
2. 2.True or false: a claw hammer on a nail is a lever. (a) False (b) True
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
4. 4.🏋️ Pushing a crate 4 m took 520 J of work. What force was used, in newtons?
5. 5.True or false: a movable pulley rises with the load. (a) False (b) True
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.True or false: a crowbar is a lever. (a) False (b) True
8. 8.⚖️ A lever bar balances. The load is 480 N at ? cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
11. 11.🏋️ A force of 250 N pushes a cart 4 m along the floor. How much work is done, in joules?
12. 12.True or false: a chisel is a wedge. (a) True (b) False
13. 13.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
14. 14.🪝 A winch has a wheel of radius 32 cm and an axle of radius 4 cm. What effort on the wheel lifts a 720 N bucket on the axle, in newtons? (ideal)
15. 15.True or false: skating on ice gives less friction. (a) False (b) True
16. 16.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.True or false: a movable pulley only changes direction. (a) True (b) False
18. 18.💪 A bag has a mass of 34 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
22. 22.⚙️ Which simple machine is a crane hook block? (a) wedge (b) pulley (c) inclined plane (d) lever
23. 23.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
24. 24.True or false: sand on a slippery path gives less friction. (a) True (b) False
25. 25.⚖️ 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 3 (b) class 2 (c) class 1
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.⚖️ A seesaw balances. Asha (190 N) sits ? m from the pivot on one side; Arjun (760 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
28. 28.🏋️ A force of 340 N did 340 J of work. How many metres did the object move?
29. 29.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
30. 30.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
31. 31.True or false: closing a drawer is a pull. (a) True (b) False
32. 32.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
33. 33.🪝 A pulley system lifts a 640 N load with an effort of 160 N. What is its mechanical advantage (MA)?
34. 34.💪 Two children push a box to the right, one with 60 N and the other with 15 N. What is the net (total) force on the box, in newtons?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
36. 36.🔍 Which is the odd one out? (a) the tip of a nail (b) a round doorknob (c) a steering wheel (d) a water tap handle
37. 37.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.🪝 A bucket weighing 110 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.⚖️ A seesaw balances. Zoya (600 N) sits 1 m from the pivot on one side; Ravi (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
40. 40.Which of these is a wheel and axle? (a) a wood screw (b) a door stopper (c) a round doorknob (d) a road up a hill

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