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Velocity
Acceleration
Constant Acceleration
Free Fall
Forces and Newton's Law
Kinetic Energy
Potential Energy
Free Fall
Forces
Conservation of Energy
Conservation of Momentum
PHYSICS LINKS
Thinkquest Physics LibraryPhysics 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.
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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?
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.
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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:
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In this problem we are given the following: |
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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.