The motion of any moving object can be described by its speed– time graph. Data from the graph can be used to calculate acceleration, the distance travelled and the average speed for the motion.

Which statement best describes average speed?

Speed measured several times then added together and divided by the number taken

The speed of an object measured over the whole journey

The speed of an object at the very instant of being measured

What unit is average speed measured in?

Metres per second

Metres

Seconds

What is the relationship that describes average speed?

What is the average speed of a car that travels in ?

Which of the following is an example of instantaneous speed?

The quoted 0-60 of a car

The reading on a speedometer of a car

The quoted top speed of a car

How can we tell how big the acceleration of an object is from its speed-time graph?

The larger the slope, the smaller the acceleration

The smaller the slope, the bigger the acceleration

The larger the slope, the bigger the acceleration

How do we know from its speed-time graph if an object is slowing down (decelerating)?

If the line slopes downwards from left to right on the graph, it is decelerating.

If the line slopes upwards from left to right on the graph, it is decelerating.

If the line slopes downwards from right to left on the graph, it is decelerating.

What unit is acceleration measured in?

Metres per second per second

What is the relationship that describes acceleration?

What unit is time measured in?

What is the acceleration of a car that accelerates from to in 5 seconds?