an object is in________ when its distance from another object is changing
a place or object used for comparison to determine if something is in motion
An object is un motion if it ________ position relative to an reference point
International System of Units
abbreviation for SI
What number is the SI based on?
What is the basic unit of lenghth for SI?
How many centimeters are there in a meter
How many meters are there in a kilometer?
Distance divided by Time
What is the formula used to calculate the speed of an object?
Divide the total distance the cyclist traveled bt the total time
How would you find the average speed of a cyclist throughout an entire race.
speed in a given direction is called
the direction in which it is moving
an approaching storm is moving at 15km/hr. What do you need to know to determine its velocity?
the horizontal, or x-axis
on a graph of motion, on which axis is the time shown?
a push or pull on an object
ways a unbalanced force can affect an objects motion
start it moving,stop the object,change the direction it is moving
the overall force acting on an object
net force changes an objects motion, the force is said to be
when two objects are in contact, each exerts a force on the other that pushes it away
the force that one substance exerts on another when the two rub against each other, helps you walk and run
pulls everything near Earth's surface toward Earth's center
result from charged particles
like poles of these repel
is the rate at which velocity changes, rewfers to increasing speed,decreasing speed, or changing direction,like a car following a gental curve in road,batter swings at abat to hit ball,a runner slows down after finishing a race
speed and direction
acceleration involves a change in these things
makes an object expereince acceleration
another word for acceleration in which speed decreases
the moon revovlving around earth
is acceleration because it is constantly changing directions