Speed & Velocity Flashcards
(25 cards)
What is Displacement?
Displacement is a measurement of the change in position of a moving body; a straight line connecting the start and end points is specified in terms of length and direction.
What is a gradient?
A gradient is a slope of a hill on a graph: rise/run
What instantaneous speed?
The speed of an object at a particular moment.
What is Precision?
How close measured values are to each other.
What does Reaction Distance mean?
Distance moved while reacting to an emergency.
What does reaction time mean?
The length of time it takes a driver to respond to a hazard.
What is the meaning of Scalar Quantity?
A quantity, such as distance or time that has size, but no direction.
What is speed?
Speed is the rate of change of distance.
Speed is a measure of how quickly something moves.
What is Systematic Error?
Error that always differs by the same amount.
What is a Vector quantity?
A vector quantity is a quantity, such a displacement or velocity, that has size and direction.
What does the term Velocity mean?
The rate of which displacement changes. In other words, velocity is how displacement changes with time.
What is the difference between Speed & Velocity?
Speed tells us how much ground is covered in a certain amount of time. Velocity is speed in a particular direction.
What is the unit of velocity?
m/s
Meters per second
Is velocity a vector?
Yes velocity is a vector because it has a magnitude and direction.
What is a Vector?
A Vector is something that has a magnitude and direction.
What does a distance time graph show?
A distance time graph shows how far an object travels as time progresses.
What does a flat line on a graph represent?
The object is not moving. (Gradient is 0)
What does a steep-slope indicate on a distance time graph?
A steep-slope indicates that the object covers greater distance then a line with a gentler slope.
What are some examples of Scalars?
Mass, speed, energy, volume, distance, temperature
What are some examples of Vectors?
Displacement, velocity, acceleration, momentum, force
Acceleration is a change in Velocity. What is acceleration?
Acceleration is a change in Velocity. This means the speed changes or/and the direction of motion changes.
How do you find acceleration?
change in velocity
Acceleration= ———————-
Time taken
Or
Acceleration = final velocity - initial velocity
——————–
Time taken
Or
A=v-u
—–
T
How do you convert m/s to Kim/hr for speed?
To get km per hour you need to times the meters per second by 3.6
To get the meters per second you need to divided the km and hour by 3.6
How do you find the average speed?
average speed=
distance
——————
Time
