Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 894 · 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.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
3. 3.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
5. 5.🏋️ A force of 340 N pushes a cart 6 m along the floor. How much work is done, in joules?
6. 6.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
8. 8.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
9. 9.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a wheel on ball bearings (d) a wet tiled floor
11. 11.True or false: closing a drawer is a pull. (a) False (b) True
12. 12.True or false: hitting a cricket ball is a pull. (a) True (b) False
13. 13.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
14. 14.True or false: chalk on a gym bar gives less friction. (a) False (b) True
15. 15.True or false: a beam balance is a class 2 lever (load in the middle). (a) False (b) True
16. 16.⚖️ A seesaw balances. Zoya (360 N) sits 4 m from the pivot on one side; Asha (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🏋️ Pushing a crate 10 m took 4700 J of work. What force was used, in newtons?
20. 20.⚖️ A lever bar balances. The load is 480 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
22. 22.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
23. 23.True or false: a fixed pulley needs effort = load. (a) False (b) True
24. 24.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) mass of fulcrum (d) time taken
25. 25.🔍 Which is the odd one out? (a) a door stopper (b) an axe blade (c) a chisel (d) a nutcracker
26. 26.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
28. 28.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
30. 30.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Arjun (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
32. 32.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.Which of these is a pulley? (a) a well winch handle (b) a well-bucket rope wheel (c) a wheelchair ramp (d) a steering wheel
34. 34.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.Which of these is a lever? (a) the tip of a nail (b) a truck loading ramp (c) a bottle opener (d) a well winch handle
36. 36.Which of these is caused by friction? (a) an apple falls down (b) brakes stop a bicycle (c) a thrown ball comes down (d) a fridge magnet sticks
37. 37.🔍 Which is the odd one out? (a) a door stopper (b) a jar lid (c) a chisel (d) an axe blade
38. 38.True or false: a bottle cap is a wedge. (a) False (b) True
39. 39.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
40. 40.⚖️ A seesaw balances. Kabir (390 N) sits ? m from the pivot on one side; Arjun (520 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?

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