Science - Physics Flashcards
(29 cards)
How do you calculate speed?
Speed=Distance/Time
What are the units for speed?
Metres per second (m/s)
How do you calculate distance?
Speed x time (s x t)
How do you calculate time?
Distance ÷ speed (d/s)
What axis does the distance go on a distance-time graph?
Y-axis
What axis does the time go on a distance-time graph?
X-axis
What does a straight diagonal line mean of a distance-time graph?
That an object is moving at a steady pace.
What does an upward curved line mean on a distance-time graph?
Acceleration
What does a downward curved line mean on a distance-time graph?
Deceleration
What do we call it when an objects speed increases?
Acceleration
What do we measure acceleration in?
m/s²
What does it mean if a line is straight and horizontal on a speed-time graph?
The object is at a constant speed.
What does it mean if it is a upward diagonal straight line of a speed-time graph?
The object is accelerating
What does it mean if it is a downward diagonal straight line of a speed-time graph?
The object is decelerating
What do we measure deceleration in?
m/s², like acceleration
How do we find the distance on a speed-time graph?
We can calculate the distance by working out the are under the graph. The distance is measured in metres (m).
What is a scalar quantity and give an example?
Scalar quantities have a size (or magnitude) only.
e.g. the speed of the car was 60km/h
What is a vector quantity and give an example?
Vector quantities have both size (or magnitude) and direction, but also in a straight line.
e.g. The boat sailed 30km North
How do we draw a vector quantity?
As an arrow
What s the displacement of an object?
How far an object has moved from its starting point an din what direction.
What is velocity?
The speed/how fast and object is, what direction it travels in a straight line.
What is acceleration?
When an object increases velocity.
How do we calculate acceleration?
Final velocity - initial velocity
Acceleration = —————————-
Time
The principle of moments states that for an object to be in equilibrium…
The sum of all the clockwise moments about a point = the sum of all the anticlockwise moments about a point
