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Physics Terms 2017
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Gravity
Key Concepts:
Terms in this set (19)
Speed | Distance | Time Formula
Speed = Distance / Time
Displacement
- Your change in position, compared to where you started
- Make sure you say which direction and how many metres
Eg. 500m west then 300m east
500-300 = 200m west
Velocity
- Speed in a given direction (displacement)
Velocity = Displacement / Time
Eg. Car moves 50m east then 20m west in 6s
50 - 20 = 30m east
30 / 6 = 5m/s east
Vector and Scalar
Vector - Displacement, Velocity, Acceleration
Scalar - Distance, Speed, Energy
Acceleration
Acceleration = Final Velocity - Initial Velocity / Time
Remember to answer with m/s2 and if its negative add a - sign
Eg. Car speed up from 10m/s to 20m/s in 5s
20 - 10 / 5 = 2m/s2
Graphing Motion - Distance V Time
Distance ( Dependent ) V Time
( Y Axis ) ( X Axis )
- Horizontal line means the object is not moving
- The gradient ( Rise / Run ) is used to calculate speed
- If the line is curved it is accelerating
Graphing Motion - Speed V Time
Speed ( Dependent ) V Time
( Y Axis ) ( X Axis )
- Horizontal line means it is moving at a constant speed
- If the line is ascending stably, then is it accelerating at a constant speed
- To calculate the distance, you find the area under the graph
Independent Variable
The thing you change Eg. Time
Dependent Variable
The thing that is effected by the Independent Variable which is measured Eg. Distance
Control Variable
The variable that remains unchanged throughout the experiment Eg. Room temperature
Inertia
- Inertia of a body is a measure of its resistance to any change in its motion
- Mass is a measure of Inertia
Gravity
- 9.8m/s2 is the acceleration due to to gravity
- Earth's Gravity is 9.8m/s2
Mass and Weight
Mass is the actual amount of material contained in a body and is measured in kg
- Weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything but weight is different on the earth, moon, etc.
Newtons First Law
An object will remain at rest or in uniform motion in a straight line, unless acted upon by an unbalanced force
Newtons Second Law
The acceleration produced by an unbalanced force acting on an object (or mass) is proportional to the magnitude of the force, and inversely proportional to the size of the mass
Formula -
Force ( N ) = Mass ( Kg ) x Acceleration ( m/s2 )
Newtons Third Law
For every action force there is an equal and opposite reaction force
Kinetic Energy
- Also known as the energy of movement
- Kinetic Energy of a moving body is calculated by the equation : Ke ( joules ) = 1/2 x mass x velocity2
Gravity Potential Energy
- GPE is the energy stored in the Gravitational field by lifting objects against the force of gravity
- The Gravitational Potential Energy can be calculated using the equation :
GPE = mass x gravity x height
Gravity Potential Energy Example
A 60 kilogram person rising a height of 1.50 metres on Earth.
m = 60 kg. h = 1.50 m. g = 10 Newtons
60 x 1.5 x 10 = 900 Joules
- When objects are raised the potential energy increases
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