What is frame of reference?

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Presentation transcript:

What is frame of reference?

A system of objects that are not moving with respect to one another.

A person walks 3 miles for exercise everyday leaving her front porch at 8 a.m. and returning to her front porch at 10 a.m. What is her displacement?

Her displacement is 0.

What is the equation for average speed?

Average speed = distance/time

This type of speed is taken at a given moment.

Instaneous Speed

What is the difference between speed and velocity?

Speed does not have a direction, velocity does.

The slope of a distance time graph is the object’s _______________.

Speed

What is the speed of an object that traveled 100 m in 25 s?

4 m/s

A distance-time graph indicates that an object moves 100m in 4s, then rests for 2s, then moves again 100m in 4s. What is the average speed?

20 m/s

The slope of a speed time graph measures the objects___________.

Acceleration

Define acceleration.

A change in speed, a change in direction, or both.

When an object is slowing down, it’s acceleration will be ____________.

Negative

What is the difference between a vector quantity and a scalar quantity?

A scalar quantity only shows magnitude A vector quantity shows magnitude and direction

The direction and length of a straight line is the object’s _____________.

Displacement

The SI units for speed are?

m/s

What is the acceleration due to gravity?

9.8 m/s2

What is the formula for calculating acceleration?

VF – VI / t