physics test

U1 L1-4

what is motion?

the change in position of an object ( relative to a reference point ) over a period of time

what is position?

the location of an object in a space, relative to a reference point.

what does change in position refer to?

to the movement of the object from one location to another.

what is a reference point?

a fixed point or location in which all other positions refer to

how are types of motion determined?

The type of motion is determined by the path described by a moving object.

what is trajectory?

the line or path described by the object during its motion

what does trajectory help us describe?

its an imaginary curve that helps us describe the motion of an object

what does linear trajectory mean?

the moving object is going in a straight line

if an object is moving along a curve, what is it called?

curvilinear trajectory

if an object is moving in a circular motion, what is it called?

circular trajectory

what is a motion diagram?

A series of images showing the positions of a moving object at equal time intervals

In a particle model, the object or objects of interest are replaced with… ?

single points

The distance between dots indicates the object's…

speed

Images that are equally spaced indicate an object moving at

a..

constant speed

An increasing distance between images shows that the object is..

accelerating

A decreasing distance between images shows that the object is…

decelerating

what is an instant of time?

a specific point in time

what is the difference between two instants of time called?

a time interval

what is a displacement?

The straight-line distance from the initial position to the final position

what is a scalar

A quantity that is just a number without any direction

give 3 examples of scalar quantities

time, distance, and temperature

what is a vector

A quantity that is a number with its direction. they are represented by arrows to show direction

give 3 examples of vector quantities

displacement, velocity, acceleration vector

what is distance?

The total length of the path travelled by an object.

what is a position-time graph?

its a graph where time data is plotted on a horizontal axis and the position data is plotted on a vertical axis

In a position-time graph, the ….. data is plotted on a horizontal axis and the…. data is plotted on a vertical axis.

time, position

what is the slopes absolute value?

an objects average speed