Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 417 · 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.🏋️ 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
2. 2.🔍 Which is the odd one out? (a) a window blind cord (b) a crowbar (c) a claw hammer on a nail (d) a bottle opener
3. 3.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
5. 5.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the fulcrum (d) the effort
6. 6.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
7. 7.🏋️ A force of 480 N pushes a cart 8 m along the floor. How much work is done, in joules?
8. 8.Which of these is a lever? (a) a road up a hill (b) a well winch handle (c) a window blind cord (d) a bottle opener
9. 9.🏋️ Pushing a crate 7 m took 840 J of work. What force was used, in newtons?
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
11. 11.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
12. 12.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) gravity (d) friction
13. 13.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
14. 14.💪 Which force is at work: shoes grip the floor? (a) friction (b) muscular force (c) gravity (d) magnetic force
15. 15.⚖️ A seesaw balances. Meena (380 N) sits ? m from the pivot on one side; Arjun (760 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
16. 16.True or false: a tug of war is a push. (a) True (b) False
17. 17.💪 In a tug of war, one team pulls right with 35 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
18. 18.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
19. 19.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a well-bucket rope wheel (d) a steering wheel
20. 20.True or false: a flagpole rope wheel is a wheel and axle. (a) True (b) False
21. 21.Which of these is caused by gravity? (a) rubbing hands warms them (b) a fridge magnet sticks (c) a thrown ball comes down (d) a magnet picks up pins
22. 22.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
23. 23.🪝 A pulley system lifts a 1200 N load with an effort of 300 N. What is its mechanical advantage (MA)?
24. 24.🔍 Which is the odd one out? (a) an axe blade (b) a jar lid (c) the tip of a nail (d) a door stopper
25. 25.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
27. 27.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Ravi (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.True or false: a fixed pulley rises with the load. (a) False (b) True
29. 29.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
31. 31.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
32. 32.True or false: a round doorknob is a wheel and axle. (a) True (b) False
33. 33.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
34. 34.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
35. 35.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.⚖️ A seesaw balances. Asha (540 N) sits 2 m from the pivot on one side; Meena (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
39. 39.🏋️ Pushing a crate 9 m took 90 J of work. What force was used, in newtons?
40. 40.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1

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