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# Calculating Acceleration from Velocity and Time

## Calculations showing change in velocity / change in time.

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Practice Calculating Acceleration from Velocity and Time

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In a Flash!

### In a Flash!

Credit: H?kan Dahlstr?m
Source: http://www.fotopedia.com/items/flickr-252549185

This pro ice hockey player is racing over the ice. He whizzes by the spectators in a flash. Hockey is one of the fastest of all sports. A professional hockey player may reach skating speeds of close to 30 miles per hour!

#### Why It Matters

• Fast skaters have a big advantage in hockey. Speed allows them to duck into spaces between other players and escape the other team’s defense.
• Credit: RichardBH
Source: http://www.flickr.com/photos/rbh/12762670535/

A higher velocity and acceleration will allow player #11 to get away from the blue defenders [Figure2]

• In addition to speed, velocity and acceleration are important measures of a hockey player’s movements on the ice.
• Credit: OpenStax College
Source: http://cnx.org/content/m42045/1.9/

Example of how velocity can be calculated in relation to ice hockey [Figure3]

• To see how these measures apply to ice hockey and how they are calculated, watch this video: http://www.nbclearn.com/nhl/cuecard/56612

#### Can You Apply It?

1. Velocity describes two things about a moving hockey player. What are they?
2. Assume that a hockey player skates 60 feet in 3 seconds. What is the player’s speed? If the hockey player travels this distance from East to West, what is his velocity?
3. What happens when a hockey player accelerates?
4. Assume a hockey player accelerates from 0 ft/s to 24 ft/s over a period of 2 seconds. What is his acceleration if his direction does not change? Explain in words what this acceleration means.

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