MotionSpeed, Velocity, and Acceleration

Frames of ReferenceThe object or point from which movement is determined Movement is relative to an object that appears stationaryEarth is the most common frame of reference

QuestionsWhat is the frame of reference for the sunset?What is a frame of reference?What is the most common frame of reference?

QuestionWhen can you determine how fast you are going in a jet plane?

MotionMotion is a change in position relative to a frame of referenceSpeed is the distance traveled in a given amount of timeSpeed=distance time

SpeedThe units for speed: meters/second (m/sec) kilometers/hour (km/hr)Speed that does not change is constant speed

Average speedTotal distance divided by the total timeFormula: Total distance total time

VelocitySpeed in a given directionVelocities in the same direction combine by adding Velocities in different directions combine by subtracting

Interesting factRockets are launched in the same direction of the earths rotation to get an extra boost of 1800 km/hr to its speed

QuestionsWhat is motion?What is speed? How is it calculated?What is average speed?

QuestionsHow is velocity different from speed?Which two factors determine an objects velocity?

AccelerationThe change in velocityAcceleration is measured in m/sec/sec or m/sec2 Formula is:(final velocity - original velocity)/time

Deceleration vs. AccelerationA decrease in velocity is deceleration or negative accelerationA distance-time graph for acceleration is always a curve

Centripetal AccelerationAcceleration directed toward the center of circular path

QuestionsWhat is acceleration?What is the shape of a distance-time graph for acceleration?What is centripetal acceleration?

MomentumMomentum is equal to the mass of an object times its velocitymomentum= mass x velocity

Conserving MomentumThe law of conservation of momentum states that the total momentum is NOT lost, only transferred

QuestionsWhat is momentum?What happens to momentum as the mass of a moving object increases?What is the formula for momentum?What is the law of conservation of momentum?