This video tutorial explains distance-time graphs and how they represent journeys. It covers the concept of average speed and how it can be calculated using distance and time. The video demonstrates that the slope of a distance-time graph is equivalent to speed, making it easy to compare speeds visually. Several examples are provided to calculate average speed for different journeys, emphasizing that a steeper gradient indicates a faster speed. The video concludes with a review of the concepts and suggests exercises for further practice.

What did we learn about the speeds of different objects during a journey?

• Objects travel at varying speeds.

• Objects do not travel at all.

• All objects travel at the same speed.

• Objects travel at a constant speed.

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NGSS.MS-PS3-1

What two pieces of information are needed to calculate the average speed of an object?

• Speed and time

• Distance and time

• Time and direction

• Distance and direction

How is the gradient or slope of a graph calculated?

• By dividing the change in the y-axis by the change in the x-axis

• By dividing the change in the x-axis by the change in the y-axis

• By multiplying the change in the y-axis by the change in the x-axis

• By adding the change in the y-axis to the change in the x-axis

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NGSS.MS-PS3-1

What does the slope or gradient of a distance-time graph represent?

• Time

• Distance

• Speed

• Acceleration

What is the average speed of an object that travels 5 meters in half a second?

• 2 meters per second

• 15 meters per second

• 5 meters per second

• 10 meters per second

Tags

NGSS.MS-PS3-1

If an object travels 4 meters in 1 second, what is its average speed?

• 5 meters per second

• 4 meters per second

• 2 meters per second

• 3 meters per second

What is the average speed of an object that travels 3.5 meters in 1.75 seconds?

• 3 meters per second

• 2 meters per second

• 4 meters per second

• 1 meter per second

What does it mean if the distance traveled is 0 meters over a period of time?

• The object is moving backward.

• The object is standing still.

• The object is decelerating.

• The object is accelerating.

What is the key takeaway about the gradient of a distance-time graph?

• It represents time.

• It represents distance.

• It represents speed.

• It represents acceleration.

Why are distance-time graphs useful?

• They help compare speeds without calculations.

• They show the color of the object.

• They indicate the weight of the object.

• They show the direction of travel.