Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 213 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
2. 2.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
3. 3.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
4. 4.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
5. 5.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
7. 7.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) metre (m) (d) second (s)
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a grippy rubber sole (d) a wet tiled floor
9. 9.⚖️ A lever bar balances. The load is 150 N at 10 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?
10. 10.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
11. 11.True or false: a fixed pulley only changes direction. (a) False (b) True
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
13. 13.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
14. 14.True or false: hitting a cricket ball is a pull. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
16. 16.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.🏋️ A force of 50 N pushes a cart 6 m along the floor. How much work is done, in joules?
21. 21.🏋️ A force of 210 N did 840 J of work. How many metres did the object move?
22. 22.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
23. 23.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
24. 24.💪 Which force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) friction (d) gravity
25. 25.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) friction (d) magnetism
27. 27.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
28. 28.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
29. 29.💪 A box weighs 270 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.Which of these is caused by magnetic force? (a) an apple falls down (b) a rolling ball slows (c) a river flows downhill (d) a magnet picks up pins
31. 31.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
32. 32.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
33. 33.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
34. 34.True or false: a bottle opener is a lever. (a) False (b) True
35. 35.🪝 A load of 80 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
37. 37.⚖️ A lever bar balances. The load is 160 N at 30 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.True or false: a crane hook block is a pulley. (a) False (b) True
39. 39.Which of these is an inclined plane? (a) an axe blade (b) a round doorknob (c) a truck loading ramp (d) a window blind cord
40. 40.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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