P9 Flashcards
What is a distance-time graph used for
You can use them to track a person walking(distance and time)
What does the gradient of a distance-time graph tell us
The objects speed
What’s the equation for a distance-time graph to work out its gradient
Gradient=distance travelled/time taken
What does a curved line suggest
The object is constantly increasing in speed
How to calculate the gradient of a curved line
Gradient=hypotenuse/opposite
What is breaking
It reduces the velocity of the vehicle so on a graph it becomes a horizontal line to show acceleration is at 0. So breaks make the car decelerate and the gradient of the line becomes negative.
What is acceleration
It’s the velocity of an object and it is it’s speed in a given direction. It’s a vector quantity as it has magnitude and direction
What does acceleration tell us
It tells us it’s change to its velocity over a given period
What’s the equation for acceleration and what does the awnser tell us
Acceleration=change in velocity(m/s) / time(s)
Negative awnser means the vehicle is decelerating and if it’s positive it’s accelerating
What does s the gradient of a velocity-time graph show us
It tells us the acceleration of the object and if it’s horizontal it’s moving at constant velocity
An upward line is an object accelerating
A downward line is decelerating
What does the area under a velocity-time graph tell us
It tells us the distance travelled in a specific direction (displacement)
What happens if a velocity-time graph is made of acceleration, deceleration and no speed
We break it down into shoes an d calculate its total area
What happens if your working out the area under a velocity-time graph but it’s a curved line
You have to just count the squares underneath it
