Lesson 1: Motion (OLD)

What is motion?

a change in position over time

On a position grid, what does an arrow from start to end position show?

motion

What two things describe how something moves?

distance and direction

On a grid, what does a longer arrow mean?

greater distance

On a grid, what does arrow direction tell you?

which way it moved

Name two metric units for distance.

meters and kilometers

What tool shows direction on a map?

compass

What tool measures angles?

protractor

What unit measures angles?

degrees

Name two units for speed.

meters per second and kilometers per hour

What is a frame of reference?

objects used to measure position or motion

Why do you feel still in a moving car but look moving to someone outside?

different frames of reference

Why do maps often have grids?

grids make positions easier to describe

What is speed?

how fast position changes

How do you calculate speed?

distance divided by time

What is velocity?

speed with direction

How is velocity different from speed?

velocity includes direction

Why is '30 meters per second north' a velocity and not just a speed?

it includes direction

What is acceleration?

change in velocity over time

How do you calculate acceleration?

change in speed divided by time

What two changes cause acceleration?

speed change or direction change

What is negative acceleration called?

deceleration

Why is moving in a curve at steady speed acceleration?

direction changes

What is inertia?

resistance to change in motion

What is momentum?

mass times velocity

What is the formula for momentum?

mass times velocity

What unit is used for momentum?

kilogram meters per second

What is the starting speed of an object at rest?

zero meters per second

What happens to momentum if mass stays the same but velocity increases?

momentum increases

What is position?

the location of an object