Calculating Speed Notes



Calculating Speed Notes

Formula:

Speed = distance

Time

Units:

Distance= kilometer (km), meters (m), centimeter (cm)

Time = seconds (s)

Speed = meters/second or centimeter/second

Practice:

Solving for Speed:

1. What is the speed of a sailboat that is traveling 100 meters in 120 seconds?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator.

2. If a cyclist in the Tour de France traveled southwest a distance of 12,250 meters in one

hour, what would the speed of the cyclist be?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

Solving for Distance:

Still use the same formula of speed = distance/ time but we can rearrange it to

distance = speed x time

1. What is the distance traveled by a police car that moves at a constant speed of 0.5km/sec for 300 seconds?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

2. What distance would be covered in 600 seconds by a train that travels at a constant speed of 3000 meters every 60 seconds?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator.

Solving for Time:

Still use the same formula of speed = distance/ time but we can rearrange it to

Time = distance/speed

1. Sounds travels 330 m/s. If a lightening bolt strikes the ground 1 km away from

you, how long will it take for you to hear it?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

3. How much time will it take for a bug to travel 5 meters across the floor if it is

traveling at 1 m/s?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

Calculating Velocity:

** Remember that speed and velocity are the same thing EXCEPT that velocity

has a direction given

Formula:

velocity = distance/ time

Units:

km/s, m/s, cm/s + a direction such as northeast (NE) or southwest (SW)

Practice:

1. Calculate the velocity of a car that travels 556 kilometers northeast in

12240 seconds.  

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

2. If a projectile flies north 387 meters in 5.8 seconds, what is its velocity?

Step 1: Write down the equation you need to solve the problem.

Step 2: Place the known information into the equation.

Step 3: Solve. Carefully enter the numbers into your calculator

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