Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 726 · 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 wheel on ball bearings (b) powder on a carrom board (c) skating on ice (d) a box pushed on carpet
2. 2.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
3. 3.True or false: a seesaw is a class 2 lever (load in the middle). (a) True (b) False
4. 4.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
5. 5.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1200 N bucket on the axle, in newtons? (ideal)
6. 6.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
7. 7.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
8. 8.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the pulley (d) the load
9. 9.Which of these is caused by friction? (a) pedalling a cycle (b) a thrown ball comes down (c) rain falls to the ground (d) rubbing hands warms them
10. 10.🏋️ Pushing a crate 5 m took 650 J of work. What force was used, in newtons?
11. 11.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
12. 12.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
13. 13.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
14. 14.💪 Two children push a box to the right, one with 45 N and the other with 95 N. What is the net (total) force on the box, in newtons?
15. 15.🏋️ 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
16. 16.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the effort (d) the fulcrum
18. 18.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
19. 19.Which of these is a lever? (a) a crowbar (b) a window blind cord (c) a chisel (d) a round doorknob
20. 20.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
22. 22.⚙️ Which simple machine is a door stopper? (a) screw (b) inclined plane (c) wedge (d) wheel and axle
23. 23.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings
25. 25.🏋️ A force of 290 N did 870 J of work. How many metres did the object move?
26. 26.🏋️ Pushing a crate 1 m took 60 J of work. What force was used, in newtons?
27. 27.💪 A cart is pulled to the right with 50 N and to the left with 55 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
28. 28.💪 In which unit do we measure force? (a) newton (N) (b) metre (m) (c) second (s) (d) litre (L)
29. 29.🏋️ A force of 180 N pushes a cart 9 m along the floor. How much work is done, in joules?
30. 30.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) friction (c) gravity (d) muscular force
31. 31.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
32. 32.💪 Which force is at work: a river flows downhill? (a) gravity (b) magnetic force (c) friction (d) muscular force
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
34. 34.True or false: a movable pulley stays in one place. (a) False (b) True
35. 35.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
36. 36.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the fulcrum (d) the effort
37. 37.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
38. 38.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
39. 39.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
40. 40.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull

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