The notion of motion Flashcards
What is motion?
Motion is the change in position. The position of an object is its location
Explain how frame of reference is related to motion
How we become conscious of motion depends on our frame of reference. Frome of reference refers to something that is not moving with respect to an observer that can be used to detect motion.
Define speed and five the SI unit for speed
Speed is the distance traveled by an object in a unit of time. It is the measure of how fast or slow an object is moving. The SI unit for speed is m/s
Show how to calculate average speed from distance and time
Speed = Distance/time
What is instantaneous speed?
Speed may be constant but it varies from moment to moment. The speed at any given instant or at a certain moment. It is much harder to calculate than average speed.
Distinguish between velocity and speed
Speed is how fast or slow an object moves.
Velocity is a measure of both speed and direction of motion. Velocity is a vector, which is a measurement of size and direction.
Represent velocity with vector arrows
Velocity can be represented with arrows, the length of the arrow representing the speed and the way the arrow points in the direction
Describe objects that have different velocities
Objects that have different velocities only if they are moving in different directions, speeds, or both. Objects have the same velocities if they are moving in the same direction and speed.
Show how to calculate average velocity when the direction is constant. What is the SI unit of velocity?
Velocity = Displacement/time
The SI unit for velocity is m/s plus the direction the object is traveling
Describe what is a position-time graph.
Motion can be represented by a position-time graph, which plots position relative to the starting point on the y-axis and the time on the x-axis.
Explain how a position time graph shows the velocity of a moving object
The slope of a position-time graph represents velocity. The steeper the slope is the faster the motion is changing.
Show how to calculate the average velocity of a moving object from a position time graph
Average velocity can be calculated from a position time graph as the change in position divided by the corresponding time.
What is acceleration? What is the formula for acceleration?
Acceleration is the rate of change in the velocity of a moving object. It measures the rate at which the change is occurring. It may reflect a change in speed, direction, or both. Like velocity, it is a vector quantity.
Acceleration = (Final velocity - Initial velocity)/time
Give examples of acceleration
Examples of acceleration include riding a carousel, free fall and spinning a basketball
Describe how it feels to accelerate
When we accelerate we feel a change in speed and/or direction
