Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 366 · 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 can a force NOT do? (a) change its colour (b) stop it moving (c) start it moving (d) change its shape
2. 2.True or false: kicking a football is a pull. (a) True (b) False
3. 3.💪 Two children push a box to the right, one with 5 N and the other with 80 N. What is the net (total) force on the box, in newtons?
4. 4.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 250 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.True or false: closing a drawer is a push. (a) False (b) True
6. 6.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 80 N. What is the size of the net force, in newtons?
7. 7.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
9. 9.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
10. 10.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) friction (d) muscular force
11. 11.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
12. 12.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
13. 13.⚖️ 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
14. 14.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
15. 15.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
16. 16.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
17. 17.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
19. 19.⚖️ A lever bar balances. The load is 100 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.True or false: a movable pulley stays in one place. (a) True (b) False
21. 21.🏋️ A force of 230 N pushes a cart 9 m along the floor. How much work is done, in joules?
22. 22.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Ravi (340 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
24. 24.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) lever (c) wedge (d) screw
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the load (d) the fulcrum
27. 27.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
28. 28.💪 Two children push a box to the right, one with 5 N and the other with 95 N. What is the net (total) force on the box, in newtons?
29. 29.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
30. 30.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
31. 31.⚖️ A lever bar balances. The load is 350 N at 40 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
33. 33.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Ravi (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) sand on a slippery path (d) skating on ice
35. 35.⚖️ What is the pivot point of a lever called? (a) the axle (b) the effort (c) the fulcrum (d) the load
36. 36.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
37. 37.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
38. 38.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
39. 39.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a round doorknob (c) a flagpole rope wheel (d) a crane hook block
40. 40.🏋️ A force of 190 N did 570 J of work. How many metres did the object move?

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