# Best answer: How do we know if an object is speeding up or slowing down based on a PT graph?

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## How can you tell if an object is speeding up or slowing down from a position time graph?

That is, if the line is getting further away from the x-axis (the 0-velocity point), then the object is speeding up. And conversely, if the line is approaching the x-axis, then the object is slowing down.

## How do you know if velocity is decreasing?

Acceleration and Slope

If the line is horizontal, as it is between 4 and 7 seconds, velocity is constant and acceleration is zero. If the line slopes downward, like the line between 7 and 10 seconds, velocity is decreasing and acceleration is negative. Negative acceleration is called deceleration.

## Does velocity increase as an object goes up?

When you project an object upward and release it at its initial velocity, it is moving in the opposite direction of the force of gravity. The object slows down as it moves upward until it reaches a maximum height, at which time the velocity is zero. Then the velocity increases as the object falls toward the ground.

## When velocity increases does speed increase?

Explanation: Speed increases when velocity and acceleration have the same sign. In section A, the velocity is positive because it’s above the x axis and the slope is positive, meaning that the acceleration is positive.

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## Does negative velocity mean slowing down?

If velocity and acceleration have opposite signs, you slow down. Negative velocity = You move backwards. Negative acceleration = You slow down or you go faster in the backwards direction.

## How can you say that an object is speeding up or slowing down using the concept of instantaneous velocity?

To understand it in simple words we can say that instantaneous speed at any given time is the magnitude of instantaneous velocity at that time. It is a limit of the average speed as the time interval become very small. A moving object does not have the same speed during its travel.