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CORC 1331 MAIN PAGE

PHYSICS TOPICS

Speed
Velocity
Acceleration
Constant Acceleration
Free Fall
Forces and Newton's Law
Kinetic Energy
Potential Energy

LIST OF EXAMPLES

CLASSIC PROBLEMS

Free Fall
Forces
Conservation of Energy
Conservation of Momentum

PHYSICS LINKS

Thinkquest Physics Library
Physics Zone
Multimedia Physics Studio

Speed

When physicists talk about speed, they are concerned with how fast an object is moving. The following formula is used to calculate the average speed of a moving object.


Example 1:

How to find the distance a car travels if you know the average speed and time.


Problem:
How far would a car go in two hours if its average speed is 15 km/hr?

Car traveling on a road

Solution:

Step 1:

In this problem we are given the following:

time = 2 hours
average speed = 15 km/hr

Step 2:

Plug the data into the given formula:




In order to find the distance we need to multiply both sides of equation by 2 hr:


distance = 30 km

Answer: The distance the car travels is 30 km.

Example 2:

How to find the amount of time it takes a car to travel if you know the average speed and distance.


Problem:
How long does it take a car with an average speed of 25km/hr to travel 300 km?

Solution:

Step 1:

In this problem we are given the following:
average speed = 25 km/hr
distance = 300 km

Step 2:

Plug the data into the formula:


In order to calculate the time, you take the distance and divide it by average speed.


Answer: It takes the car 12 hours to travel 300 km.