Motion, Movement, Forces (Year 10) Flashcards
What is an equation’s use?
Equations are used to calculate quantities, using mathematical concepts
What is the equation for average speed?
Speed = distance/time
Define speed
How fast the position of an object moves over time (scalar quantity)
Why do we use “average speed”?
Most things do not travel at a consistent speed (unless they are on cruise control) so average is used
What is instantaneous speed?
How fast an object is travelling at a particular moment. ie - reading speed from a speedometer.
Is average speed and speed the same?
Yes
What units are speed measured in?
m/s (metres per second) or km/h (kilometers per hour)
If something is stationary, it is…
Stationary relative to us
What is a scalar quantity
Numerical value (eg. weight, speed, “70km/h”)
What is a vector quantity
Speed and direction (eg. “80km/h going North”)
How to get m/s to km/h?
/3.6
How to get km/h to m/s?
x3.6
What is velocity?
Speed with direction (eg. 5 km/h South)
What is the equation for velocity?
Same as speed (s=d/t)
What is the equation for distance?
Distance = speed x time
What is the equation for time?
Time = distance / speed
What is acceleration?
Increasing change in motion, increase in speed
What is deceleration?
Decreasing speed
Name types of relevant graphs
Distance/Time, Displacement/Time
(and speed/time but not as relevant)
In Distance/Time graph, what does a horizontal line mean?
CONSTANT SPEED
In a graph, what does a upward curve mean
Accelerating
In Distance/Time graph, what does a leveling curve mean
Slowing/stopping