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## Velocity and Speed Formula

speed = distance

time

• speed is how fast you are moving
• velocity is how fast you are moving in the given direction
• speed = m/s
• distance = m
• time = sec
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## Acceleration Formula

acceleration = change in velocity

time

• how quickly the velocity is changing
• change in velocity = final velocity - starting velocity
• velocity = m/s
• acceleration = m/s2
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## Distance-Time Graph

• B-C - stopped
• curved lines - acceleration or deceleration, not steady speed
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## Velocity-Time Graph

• B-C - deceleration
• D-E - acceleration
• area under graph = distance travelled

• y2-y1

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## Gravity

• Force of attraction between ALL masses
• on the surface of a planet - makes things move towards the ground, pull towards the center of earth
• give EVERYTHING a weight
• keeps planets, moons and satellites in orbit
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## Weight and Mass

Weight

• measured in newtons (N)
• weight is caused by gravity
• weight changes - different on the moon than on earth
• measured by a newton meter

Mass

• measured in kilograms (kg)
• the 'amount of stuff' in an object
• the same everywhere
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## Weight Formula

weight = mass x gravitational field strength

• mass = kg
• weight = newtons
• gravity different on different planets - earth = 10N/kg, moon = 1.6N/kg
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