Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 868 · 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 glass sheet 5 N, a wooden plank 9 N, a carpet 13 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
3. 3.🏋️ A force of 90 N pushes a cart 10 m along the floor. How much work is done, in joules?
4. 4.🏋️ A force of 190 N did 570 J of work. How many metres did the object move?
5. 5.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
7. 7.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
10. 10.🏋️ Pushing a crate 7 m took 3360 J of work. What force was used, in newtons?
11. 11.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
12. 12.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) powder on a carrom board (d) a box pushed on carpet
14. 14.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
15. 15.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
16. 16.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
17. 17.Which of these is caused by gravity? (a) a rolling ball slows (b) a fridge magnet sticks (c) a river flows downhill (d) a compass needle turns
18. 18.🏋️ Pushing a crate 6 m took 480 J of work. What force was used, in newtons?
19. 19.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
20. 20.⚖️ A lever bar balances. The load is 270 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 360 N bucket on the axle, in newtons? (ideal)
22. 22.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
23. 23.⚖️ A seesaw balances. Asha (120 N) sits 3 m from the pivot on one side; Kabir (360 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 2 (c) class 1
25. 25.🪝 A pulley system lifts a 120 N load with an effort of 40 N. What is its mechanical advantage (MA)?
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
28. 28.🏋️ A force of 420 N pushes a cart 5 m along the floor. How much work is done, in joules?
29. 29.True or false: a rough doormat gives less friction. (a) False (b) True
30. 30.Which of these is a screw? (a) a jar lid (b) a flagpole rope wheel (c) a seesaw (d) a claw hammer on a nail
31. 31.Which of these is a lever? (a) a chisel (b) a wheelchair ramp (c) a crowbar (d) a screw jack
32. 32.💪 A force is a … (a) unit of time (b) type of sound (c) kind of colour (d) push or a pull
33. 33.True or false: a fixed pulley halves the effort. (a) False (b) True
34. 34.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) friction (d) wind
35. 35.💪 A cart is pulled to the right with 80 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
36. 36.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the axle
37. 37.True or false: a movable pulley only changes direction. (a) True (b) False
38. 38.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
39. 39.🔍 Which is the odd one out? (a) a road up a hill (b) a truck loading ramp (c) a flagpole rope wheel (d) a wheelchair ramp
40. 40.⚙️ Which simple machine is a claw hammer on a nail? (a) lever (b) wedge (c) screw (d) pulley

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