Exploring Speed, Velocity, and Acceleration in Physics

Miss Barker explains the concepts of speed, velocity, and acceleration. Speed is defined as a scalar quantity, calculated as distance divided by time, with examples provided. The video also covers graphing speed using distance-time graphs. Velocity is introduced as a vector quantity, including direction. Acceleration is discussed as the rate of change of velocity, with examples and graphing techniques. The video concludes with a preview of kinematic equations.

What is the unit commonly used for measuring speed in this class?

• miles per hour

• feet per second

• kilometers per hour

• meters per second

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If a car travels 250 meters in 60 seconds, what is its speed?

• 4.17 meters per second

• 5 meters per second

• 6 meters per second

• 3.5 meters per second

Using the mnemonic triangle, how do you calculate time?

• Multiply speed by distance

• Multiply distance by time

• Divide speed by distance

• Divide distance by speed

What does a flat horizontal line on a distance vs. time graph indicate?

• Decreasing speed

• No movement

• Increasing speed

• Constant speed

What is the difference between speed and velocity?

• There is no difference

• Velocity is a scalar quantity

• Velocity includes direction

• Speed includes direction

What does negative acceleration indicate?

• Slowing down

• No movement

• Speeding up

• Constant speed

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If a motorcycle increases its speed from 11 m/s to 20 m/s in 4 seconds, what is its acceleration?

• 2.75 m/s²

• 2.5 m/s²

• 2.25 m/s²

• 2.3 m/s²

How long did it take for a speed skater to stop if her acceleration was -2.9 m/s² from a speed of 13 m/s?

• 3.5 seconds

• 4.5 seconds

• 5 seconds

• 4 seconds

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What does a curved line on a speed vs. time graph typically indicate?

• Changing speed

• No movement

• Constant speed

• Decreasing speed

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What type of acceleration is depicted if the speed is increasing over time?

• Variable

• Positive

• Negative

• Zero