Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 896 · 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 pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
2. 2.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
4. 4.💪 A cart is pulled to the right with 80 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) skating on ice (d) chalk on a gym bar
6. 6.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) friction (d) magnetic force
7. 7.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) litre (L) (d) newton (N)
8. 8.True or false: pressing a doorbell is a pull. (a) True (b) False
9. 9.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
10. 10.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.True or false: powder on a carrom board gives less friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
13. 13.⚖️ A seesaw balances. Asha (300 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
15. 15.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
16. 16.🪝 A bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.⚖️ What is the pivot point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
18. 18.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
19. 19.⚖️ A lever bar balances. The load is 540 N at ? cm from the fulcrum. The effort is 450 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
21. 21.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
22. 22.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
23. 23.⚙️ Which simple machine is a wood screw? (a) screw (b) inclined plane (c) wedge (d) lever
24. 24.🏋️ Pushing a crate 5 m took 50 J of work. What force was used, in newtons?
25. 25.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
26. 26.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Meena (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
30. 30.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
32. 32.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
33. 33.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
35. 35.🏋️ A force of 210 N pushes a cart 4 m along the floor. How much work is done, in joules?
36. 36.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
37. 37.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
38. 38.True or false: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
39. 39.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1

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