The portal has been deactivated. Please contact your portal admin.

Question Video: Recognizing Uniform Speed Science

If the speed of an object changes as the object moves, is the speed of this object uniform?

01:23

Video Transcript

If the speed of an object changes as the object moves, is the speed of this object uniform?

This question asks us whether a changing speed can be a uniform speed. If an object moves uniformly, this means that in any two equal time intervals that the object travels for, the distance that the object travels in each time interval is equal.

Let’s consider the uniform motion of a bicycle. We can see the position of the bicycle at different distances. We can see that the distances between these positions are all equal to 10 meters. We can see that the time intervals between these times are all equal to one second.

Recall that the speed of an object is the distance that the object travels divided by the time that the object travels for. We can see then that in each time interval, the speed of the object is 10 meters per second. The question is asking about an object that changes speed as it moves. If the object changes speed, then the speed of the object in different time intervals can be different.

For this bicycle, the distances moved in each time interval are still 10 meters, but the speed in each time interval is different. This means that the time intervals cannot be equal. So we can see that if an object changes speed, it cannot be moving equal distances in equal time intervals. Therefore, the object cannot be moving uniformly.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.