Flashcards in Ch. 6 Deck (15):
What is speed?
the ratio of the distance an object moves to the amount of time it takes to move
how is instantaneous speed different from average speed?
Instantaneous speed- the speed at a certain moment in time
average speed- the speed for an entire trip
How do you find the average speed?
(Velocity=distance divided by time)
What type of speed does a speedometer on a car show?
The slope on a distance-time graph represents __________.
Describe a change in velocity.
-A moving object gains speed
-A moving object changes direction
-A moving object slows down
A river flows at a velocity of 3 km/h relative to the riverbank A boat moves upstream at a velocity of 15 km/h relative to the river What is the velocity of the boat relative to the riverbank?
12 km/h upstream
The rate at which velocity changes is called what?
Because acceleration is a quantity that has both magnitude and direction, it is a ___________.
___________ is the result of increases and decreases in speed.
Ignoring air resistance, a rock in free fall will have a velocity of what?
Describe constant acceleration.
a steady change in velocities
What equation can you use to calculate the acceleration of an object?
When the final velocity is ____ than the initial velocity of an object, the acceleration is negative.