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Physics: GP 2- 6th grade
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Gravity
Key Concepts:
Terms in this set (16)
Newton's 1st law of Motion
Definition: An object at rest remains at rest, an object in motion remains at a constant velocity unless acted on by unbalanced forces
Example: Without unbalanced forces, an object will never accelerate
Inertia
Definition: Resistance to change in motion
Equation: Inertia= Mass
Unit: Kilograms (Kg)
Mass (m)
Definition: Amount of matter in an object
Amount of inertia in an object
Example: Your mass is the same on the moon-- but your weight is not
Unit: Kilogram
Weight
Definition: The force of gravity pulling down on an object
Equation: weight= m x g(9.8 or 10 m/s²)
Unit: Newtons
Newton's second law of motion
Definition: Acceleration is directly proportional to force and inversely to mass. It is in the direction of the net force.
Equations: F=MA; M= F/A; A=F/M
Directly proportional
Definition: Increasing one quantity would have the same effect on another.
Example: Your pay check is directly proportional to your hourly wage
Inversely proportional
Definition:If one quantity increases, it has the opposite effect on another
Example: Your free time should be inversely to the amount of homework you have
Force
Definition: A push or pull
Equation: Mass x Acceleration
Unit: Newtons
Vector quantity
Definition: A quantity that requires both magnitude and direction
Examples: Velocity, Acceleration, Force, Momentum
Scalar quantity
Definition: A quantity that requires magnitude but not direction
Examples: Speed, Mass, Volume, Energy
Equilibrium
Definition: Net Force= 0
Balanced forces= 0
Acceleration=0
Constant velocity
Example: A train moving on a straight line at constant speed
Normal Force
Definition: The support force that pushes up, supporting an object's weight
Example: The floor supports you with a normal force equal to your weight
Unit: Newton
Tension Force
Definition: The pulling force exerted by a string, chain, or similar object
Example: Swing chains support you with tension force equal to your weight
Unit: Newtons
Friction Force
Definition: The force that opposes motion between two surfaces that are touching
Example: Cars stop because of friction between the brakes and wheels
Unit: Newton
Net Force
Definition: The combination of all forces on an object
Equation: Add forces in the same direction, subtract forces in opposite directions
Unit: Newtons
Newton's 3rd law of Motion
Definition: Every action force has an equal and opposite reaction force (same size and opposite direction)
Example: Action= hammer hitting nail with 50 N to the right & Reaction= Nail hitting hammer with 50 N to the left
Equation: Size of action force= size of reaction force
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