cgs science Flashcards
what is the difference between distance and displacements
distance is the length of the full route you take from point a to point b while displacements are the distance if you took a straight line from point a to point b
name the 2 types of speed
average speed, instantaneous speed
what is average speed in measuring
average speed is a measure of how fast something moves overall, the average speed ignores the stops and changes in speed that happen in any journey and instead assume that the object was travelling at the same speed the whole time.
what is instantaneous speed in measuring
your speed at a particular instant is called your instantaneous speed. this speed is normally shown in a speedometer.
how does a mobile speed camera work
a mobile speed camera relies on radar technology.
what are fixed speed cameras
fixed speed cameras rely upon vehicles driving over two electronic sensors that are placed a fixed distance apart. the speed of the vehicle can be calculated by measuring the time a vehicle takes to drive from one sensor to the next.
how do handheld speed cameras work
handheld speed cameras send a beam of laser light across a road. cars relflect this beam and alter its frequency.
how to point to point cameras work
take a series of digital photos from cameras that are a fixed distance apart.
what is the the average reaction time of someone who is alert
0.15-0.3 seconds
What is a displacement-time graph?
A graph that represents the relationship between an object’s position and the time it takes to cover that distance.
What does the slope of a displacement-time graph represent?
The slope of a displacement-time graph represents the velocity of an object.
What does a straight line on a displacement-time graph mean?
A straight line on a displacement-time graph means that the object is moving with a constant velocity.
What does a curved line on a displacement-time graph mean?
A curved line on a displacement-time graph means that the velocity of the object is changing.
What does a horizontal line on a displacement-time graph mean?
A horizontal line on a displacement-time graph means that the object is not moving, i.e., its velocity is zero.
what is the equation to calculate the distance it takes to stop a car
stopping distance= reaction time +break distance
