Linear Motion Flashcard Review

Front

What does the speedometer of a moving car measure?

Back

Instantaneous speed

Front

How much does the speed of a rock in freefall increase each second?

Back

The speed increases by 10 m/s every second

Front

In which direction does gravity always act?

Back

Down - toward the earth

Front

If a train accelerates from rest at a rate of 2 m/s², how long will it take to reach a speed of 30 m/s? (t = V/a)

Back

15 s

Front

What quantity describes how fast something is moving (distance divided by time)?

Back

Speed

Front

Define speed in terms of distance and time.

Back

Speed is the distance traveled divided by the time taken.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction).

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity per unit time.

Front

What is the formula for calculating acceleration?

Back

Acceleration (a) = (Final velocity (V) - Initial velocity (u)) / Time (t)

Front

What is the unit of acceleration in the SI system?

Back

Meters per second squared (m/s²)