Lecture 1.3 Motion

What is motion?

Relative change of an object in space time

• Every motion is relative

How is motion measured?

To measure motion, we need:

• A reference point

• A ruler to measure spatial change (distance)]

• A clock to measure the temporal change (time)

t

What are some examples of scalars?

• distance

• speed

• mass

• energy

What are some examples of a vector?

• displacement

• velocity

• acceleration

• force

• momentum

What are the basic laws of vectors?

• Any two or more vectors with,

  • Equal in magnitude (same size)

  • Parellel in direction

are equal to each other

• Any two vectors parallel to each other but opposite in direction (anti-parallel) has opposite signs.

q

when do you add vectors?

if two vectors are parallel and in the same direction, you can add them just like scalars while maintaining the correct direction

When do you subtract vectors?

if two vectors are parallel and in the opposite direction you can subtract them just like scalars while maintaining the correct direction

a

x

What is scalar?

A quantity described only by magnitude

What is a vector?

A quantity described by a magnitude and a direction

What is speed?

Change in distance per unit time

What is the formula of average speed?

What is velocity?

The rate of change of displacement

What is the average velocity formula?