Physics CT1 Flashcards
What does scalar mean?
Quantities that have magnitude only
What does vector mean?
Quantities that have magnitude and a direction
What does speed mean?
How fast an object is travelling
What does velocity mean?
Speed with a direction
What does acceleration?
The rate of change of velocity
What does displacement mean?
Shortest point between two points
What does mass mean?
How much of something there is
What does weight mean?
The force of gravity with mass
What is mass measured in?
Kg
What is weight measured in?
Newtons
How to calculate weight?
Mass times Gravity
What does instantaneous speed mean?
the speed at a particular point in a journey
What does average speed mean?
total distance divided by the total time taken
How to calculate speed?
distance divided by time
What does a horizontal line mean on a distance time graph?
stationary/ not moving
What does a consistent gradient mean on a distance time graph?
consistent speed
What does a steeper line mean on a distance time graph?
The faster it is moving
What does a downward line mean on a distance time graph?
Going/moving backwards
What does acceleration mean?
Is a change in velocity per second
DIRECTION MATTERS
How do calculate acceleration?
final velocity minus initial velocity divided by time taken
Why does acceleration happen?
Due to gravity
What is the gravitational field strength?
9.8 or 10
What happens when an object has a negative acceleration number?
It is losing speed
What is the long formula for acceleration when the distance is unknown?
v2-u2=2xaxX
Define momentum
A combination of mass and gravity
Define acceleration
Change in speed or velocity of an object over a certain time
Define force
an influence that can cause an object to change its velocity
Define energy
The capacity for doing work
Define distance
The total length of the path covered by an object it is scalar
Define displaysment
The shortest distance between the initial and final position of an object it is vector
Difference between velocity and speed
Velocity is a vector that measures both magnitude and direction while speed is scalar that measures only magnitude
Typical speed for walking
1.5 m/s
Typical speed for running
12 km/h
Typical speed for cycling
6 m/s
Typical speed of car
30 mph
How to work out the gradient of a distance time graph
vertical difference between two points on a graph divided by the horizontal difference between the same two points
