Topic 5, Part 2 - Forces ye dawg Flashcards

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1
Q

what are scalar quantities

A

they are quantities that only have magnitude and no direction

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2
Q

how are vectors usually represented

A

by an arrow and the length of the arrow shows the magnitude and the direction of the arrow shows the direction of the quantity

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3
Q

what is a distance

A

distance is just how far an object has moved. it is a scalar quantity.

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4
Q

what is a displacement

A

displacement is a vector quantity. it measures the distance and direction in a straight line from starting point to endpoint

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5
Q

example of distance and displacement

A

walk 5 meters north, walk 5 meters south. your displacement is 0m and your distance traveled is 10m

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6
Q

what are speed and velocity

A

speed is just how fast you are going with no regard to the direction e.g. 30mph. velocity is speed in a given direction e.g. 30mph north

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7
Q

examples of speed and velocity

A

a car can have a constant speed but a changing velocity such as going around a roundabout.

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8
Q

speed equation

A

speed (M/S)= distance( m) / time (S)

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9
Q

typical everyday speeds of a person

A

walking 1.5 m/s
running 3m/s
cycling 6m/s

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10
Q

typical everyday speeds of vehicles

A

car 25m/s
train 30m/s
plane 250m/s

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11
Q

what is acceleration

A

acceleration is the change in velocity in a certain amount of time

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12
Q

acceleration equation

A

Acceleration (m/s²) = Change in velocity (m/s) / Time (s)

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13
Q

how does friction slow things down

A

friction always acts in the opposite direction of movement.

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14
Q

What is drag

A

drag is a resistance you get in a fluid (gas or liquid). air resistance is a drag. as drag increases so does speed

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15
Q

what is terminal velocity

A

terminal velocity is when an object is falling and it has reached its max speed due to air resistance and weight

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16
Q

what affects terminal velocity

A

less streamlined objects have a lower termianal velocity. larger surface area, lower terminal velocity.

17
Q

what is newtons first law

A

if the resultant force of an object is stationary, the object is zero and will remain stationary. if the resultant force on a moving object is zero, it’ll carry on moving at the same velocity.

18
Q

What is newtons second law

A

acceleration of an object is directly related to the net force and inversely related to its mass

19
Q

equation for resultant force

A

Resultant force (n) = Mass (Kg) X Accerlation (m/s²)

20
Q

what is inertia

A

inertia is the tendency for a motion to remain unchanged

21
Q

what is newtons third law

A

when two objects interact, the force they exert on each other are equal and opposite