Physics Review for the GHSGT. Speed Measure of how quickly an object gets from one place to another.

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Presentation transcript:

Physics Review for the GHSGT

Speed Measure of how quickly an object gets from one place to another

Speed, distance and time

Speed and velocity v=d/t Steeper the line, greater the speed Distance vs. Time

Acceleration Rate of change in speed per time Example Driver of a car hitting the gas and traveling faster 35 mi/hr/sec Driver of a car hitting the brakes -20 mi/hr/sec (negative acceleration)

a=200-0/0.8 a=250 m/s 2

Momentum The more momentum an object has, the more difficult it is to STOP! Momentum Velocity Mass

Force A push or pull Free Body Diagram Shows forces acting on an object Balanced forces shown 6 N

Unbalanced Forces Unbalanced forces shown Opposite directions so subtract to calculate net force Same direction, add to calculate net force 2 N 6 N

Friction and air resistance The force between 2 objects in contact that opposes the motion of either object Types of friction Rolling Sliding Air Viscous (fluids)

Gravity The attraction Gravitational force between to objects is proportional to the product of their masses. The farther away the objects are, the smaller the gravitational force.

Newton’s First Law An object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force. Examples: Objects moving at a constant speed or not moving at all

A force will cause a mass to accelerate!

Gravity

Weight vs. Mass w=mg F=ma Remember the similarity between these two formulas. Weight is your mass times acceleration due to gravity 9.8 m/s/s on Earth

Work W=Fd Unit of measurement – Joule (J) Same unit of measurement as Energy!

Work: components of force must be parallel to displacement Picking up suitcase Carrying the suitcase