Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 574 · 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.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
2. 2.🏋️ A force of 380 N did 2660 J of work. How many metres did the object move?
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
4. 4.🏋️ A force of 420 N pushes a cart 4 m along the floor. How much work is done, in joules?
5. 5.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
6. 6.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
9. 9.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
10. 10.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
11. 11.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
12. 12.True or false: a grippy rubber sole gives less friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a bottle cap (b) a steering wheel (c) a well winch handle (d) a water tap handle
14. 14.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) True (b) False
15. 15.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
16. 16.⚖️ A lever bar balances. The load is 80 N at 20 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a bent lever (d) a tiny pulley
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the load (d) the effort
19. 19.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
21. 21.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the size of the load (d) the colour of rope
22. 22.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
24. 24.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
25. 25.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
27. 27.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
28. 28.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
29. 29.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
30. 30.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a grippy rubber sole (d) powder on a carrom board
32. 32.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
33. 33.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
34. 34.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
35. 35.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the fulcrum (c) the effort (d) the load
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
37. 37.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
38. 38.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
40. 40.⚖️ A lever bar balances. The load is 80 N at 30 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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