# Physics velocity question help.

• butter231
In summary, velocity in physics is the measure of an object's speed and direction of motion. It is calculated by dividing the displacement of an object by the time it took to make that change. While velocity and speed are often used interchangeably, there is a subtle difference between the two as velocity takes into account both speed and direction. Velocity can be negative, indicating an object is moving in the opposite direction. It plays a crucial role in determining an object's motion, as it can change an object's speed, direction, or both. Acceleration occurs when there is a change in velocity.

#### butter231

I'll give you a tip. You know 2 points from your graph.

## 1. What is velocity in physics?

Velocity in physics is the measure of an object's speed and direction of motion. It is a vector quantity, meaning it has both magnitude (speed) and direction (represented by an arrow).

## 2. How is velocity calculated?

Velocity is calculated by dividing the displacement (change in position) of an object by the time it took to make that change. The formula for velocity is v = Δx/Δt, where v is velocity, Δx is displacement, and Δt is time.

## 3. What is the difference between velocity and speed?

While velocity and speed are often used interchangeably, there is a subtle difference between the two. Speed is a scalar quantity that only measures the magnitude of an object's motion, while velocity is a vector quantity that takes into account both the speed and direction of an object's motion.

## 4. Can velocity be negative?

Yes, velocity can be negative. A negative velocity indicates that an object is moving in the opposite direction of a chosen positive direction. For example, if a car is moving west with a velocity of -50 mph, it means the car is moving in the direction opposite of east at a speed of 50 mph.

## 5. How does velocity affect an object's motion?

Velocity plays a crucial role in determining an object's motion. It can change an object's speed, direction, or both. A constant velocity means that an object is moving at a constant speed in a straight line. Acceleration occurs when there is a change in velocity, either in terms of speed, direction, or both.