Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 425 · 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.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
2. 2.True or false: a movable pulley halves the effort. (a) False (b) True
3. 3.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a rough doormat (d) a grippy rubber sole
5. 5.True or false: a tug of war is a pull. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, sandpaper 15 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
7. 7.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
11. 11.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
12. 12.🏋️ Pushing a crate 5 m took 1250 J of work. What force was used, in newtons?
13. 13.🏋️ Pushing a crate 4 m took 1680 J of work. What force was used, in newtons?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
15. 15.🏋️ A force of 380 N did 3800 J of work. How many metres did the object move?
16. 16.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.True or false: a fixed pulley stays in one place. (a) False (b) True
18. 18.True or false: pressing a doorbell is a push. (a) True (b) False
19. 19.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
24. 24.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
25. 25.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
27. 27.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
28. 28.Which of these is caused by gravity? (a) a thrown ball comes down (b) lifting a school bag (c) shoes grip the floor (d) brakes stop a bicycle
29. 29.Which of these is caused by gravity? (a) a fridge magnet sticks (b) an apple falls down (c) a magnet picks up pins (d) a rolling ball slows
30. 30.Which of these is a wheel and axle? (a) an axe blade (b) a round doorknob (c) a nut and bolt (d) a chisel
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
33. 33.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
35. 35.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) metre (m) (d) newton (N)
36. 36.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
37. 37.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) stop it moving (d) change its colour
38. 38.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
39. 39.True or false: chalk on a gym bar gives more friction. (a) True (b) False
40. 40.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley

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