Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 351 · 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.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
2. 2.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
3. 3.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
4. 4.🏋️ A force of 360 N pushes a cart 1 m along the floor. How much work is done, in joules?
5. 5.💪 Which force is at work: a compass needle turns? (a) magnetic force (b) muscular force (c) friction (d) gravity
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
8. 8.🏋️ A machine lifts a load of 1080 N when you push with 180 N. What is its mechanical advantage (MA)?
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
11. 11.⚖️ A seesaw balances. Arjun (160 N) sits ? m from the pivot on one side; Asha (640 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
13. 13.Which of these is caused by friction? (a) a fridge magnet sticks (b) shoes grip the floor (c) squeezing a lemon (d) a magnet picks up pins
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
15. 15.💪 A cart is pulled to the right with 85 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
16. 16.True or false: a fixed pulley needs effort = load. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.⚖️ A lever bar balances. The load is 140 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.Which of these is a lever? (a) a window blind cord (b) a bottle opener (c) a chisel (d) a bottle cap
20. 20.🪝 A load of 1000 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
22. 22.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
23. 23.💪 A force is a … (a) kind of colour (b) type of sound (c) push or a pull (d) unit of time
24. 24.True or false: plucking a mango is a pull. (a) True (b) False
25. 25.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
26. 26.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
27. 27.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
29. 29.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
30. 30.🪝 A pulley system lifts a 240 N load with an effort of 60 N. What is its mechanical advantage (MA)?
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) chalk on a gym bar (d) a wheel on ball bearings
32. 32.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 200 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 80 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
37. 37.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
38. 38.Which of these is a pulley? (a) a flagpole rope wheel (b) a chisel (c) a water tap handle (d) a seesaw
39. 39.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
40. 40.True or false: a smooth steel slide gives more friction. (a) False (b) True

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