# P2.1 - Motion Flashcards

How can we tell from a distance time graph if an object is moving at a constant speed?

If the gradient remains the same the object is moving at a constant speed.

How can we tell from a distance-time graph if an object is stationary?

Stationery is a horizontal line.

How can we calculate the speed of an object?

Distance travelled in metres divided by the time taken in seconds i.e. Metres per second.

What is the difference between speed and velocity?

Velocity is speed in a given direction i.e. a vector

What is acceleration and its unit?

Acceleration is change of velocity per second. Measured in metres per second squared.

How can we calculate the acceleration of an object?

Acceleration = change in velocity / time taken

What is deceleration?

The change of velocity per second when an object slows down.

What can we say if a velocity time graph is a horizontal line?

The acceleration is zero.

How can we tell from the velocity time graph if an object is accelerating all decelerating?

The gradient of the line represents acceleration.

What does the area under velocity time graph represent?

The distance travelled.

How can we calculate speed from a distance time graph?

The speed of an object is given by the gradient of the line on its distance time graph.