Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 544 · 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.🛞 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 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a rough doormat (d) chalk on a gym bar
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.True or false: a round doorknob is a wheel and axle. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a rough doormat (d) a grippy rubber sole
6. 6.Which of these is an inclined plane? (a) a water tap handle (b) a truck loading ramp (c) a jar lid (d) a bottle cap
7. 7.Which of these is a wedge? (a) a steering wheel (b) a water tap handle (c) a bottle opener (d) a door stopper
8. 8.True or false: a crowbar is a lever. (a) True (b) False
9. 9.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
10. 10.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
11. 11.True or false: pushing a trolley is a pull. (a) True (b) False
12. 12.💪 Which force is at work: lifting a school bag? (a) friction (b) magnetic force (c) muscular force (d) gravity
13. 13.Which of these is a lever? (a) the tip of a nail (b) a water tap handle (c) an axe blade (d) a bottle opener
14. 14.True or false: a movable pulley only changes direction. (a) True (b) False
15. 15.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
16. 16.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
18. 18.🪝 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
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
20. 20.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
21. 21.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a seesaw (d) a well-bucket rope wheel
22. 22.True or false: powder on a carrom board gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
24. 24.⚙️ Which simple machine is a wood screw? (a) inclined plane (b) wedge (c) screw (d) pulley
25. 25.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.💪 Two children push a box to the right, one with 5 N and the other with 85 N. What is the net (total) force on the box, in newtons?
27. 27.True or false: a crowbar is a screw. (a) False (b) True
28. 28.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
29. 29.🏋️ A force of 480 N pushes a cart 9 m along the floor. How much work is done, in joules?
30. 30.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
32. 32.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (130 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚙️ Which simple machine is a nutcracker? (a) inclined plane (b) lever (c) pulley (d) wedge
34. 34.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) litre (L) (d) metre (m)
35. 35.⚖️ A seesaw balances. Kabir (480 N) sits 2 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) brakes stop a bicycle (c) lifting a school bag (d) a compass needle turns
38. 38.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
39. 39.⚖️ A seesaw balances. Kabir (400 N) sits 1 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🏋️ Pushing a crate 2 m took 180 J of work. What force was used, in newtons?

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