Velocity or speed? Instantaneous or average? Keep building your physics vocabulary.

Your notion of velocity is probably similar to its scientific definition. You know that a large displacement in a small amount of time means a large velocity and that velocity has units of …

For example, to describe the velocity of an object, we need to know both how fast the object is moving and in which direction it goes. For example, a box can have a velocity of 5 m/s in a …

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Learn how to find an object’s instantaneous speed or velocity in three ways - by using calculus, by looking at the slope of a given point on a graph of an object’s rate vs. time, or by using …

There's multiple ways to approach these types of questions, but the big takeaway here is one, how we calculated angular velocity, and then how we can relate angular velocity to speed.

The direction of an object's motion corresponds to the sign of its velocity. So, we're looking for the interval when the velocity was positive. On a velocity vs. time graph, this corresponds to the …

Displacement is the theoretical amount traveled. Velocity is the rate in which the object changes its position. First find the displacement, then divide it by the time to get your velocity.

In this problem, all the motion of interest is close to parallel to the ground, so we can use the scalar form of the momentum and define positive velocity as the direction from the friend …

This equation can be derived by combining two equations for average velocity. Average velocity is defined as displacement divided by the time during which that displacement occurred: