Calculating Speed and Velocity

Calculating Speed, Velocity and Acceleration

Learning Target

I can define the terms speed, velocity and acceleration.

I can determine the speed, velocity and acceleration of objects in motion.

Poll

Are speed and velocity the same?

• Yes!

• No!

• I am really not sure

1. Speed is a scalar quantity.

2. Speed is how fast an object is moving.

3. A storm moving at 75 km/hr

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​What is speed?

• Distance travelled is measured in meters (m).

• Time taken is measured in seconds (s).

• Speed is measured in meters per second (m/s).
  
  The standard unit for speed in physics is m/s, but other units such as kilometers per hour (km/h) are more convenient when measuring the speed of vehicles . Why is this?

the speed of an object can be calculated using this equation:

How is speed calculated?

​Calculating speed example

Using a formula triangle

Draw

The train traveled 500 kilometers north to Odessa in 2 hours. what is the train's speed? What is it's velocity?

Fill in the Blank

How long does a horse take to run a distance of 6 miles at 16 miles/hour?

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• Velocity is a vector quantity.

• Velocity is how fast an object is moving in a certain direction.

• Ex. a storm moving at 75 km/hr towards east

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​What is velocity?

Draw

Jeremie jogged away from home heading to the east for 2 hours. When he was done, he figured that he had traveled 20 kilometers. What was his speed? what was his velocity?

Fill in the Blank

If a cross country runner covers a distance of 287 meters in 154 seconds, what is her speed?

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Multiple Choice

Which of the following scenarios would NOT result in a change in velocity?

• A car increases its speed.

• A car slows down.

• A car turns left at the same speed.

• A car continues straight at a constant speed.

What is acceleration?

​How is acceleration calculated?

​How is acceleration calculated?

Acceleration Practice Example

Using a formula triangle for acceleration

Acceleration practice example

Draw

If you are driving in a car and you go from 0 m/s to 80 m/s in 20 seconds. What is your acceleration?

Multiple Choice

Find the velocity of a plane that traveled 3000 miles west in 5 hours.

• 65 mph west
• 6 mph west
• 600 mph west
• 6000 mph west 

Multiple Choice

88 m/s north

• Speed
• Velocity
• Acceleration

Multiple Choice

How long would it take for you to swim across a lake that is 900 meters across if you swim at 1.5 m/sec?

• 600 sec
• 600 m/sec
• 0.00167 sec
• 0.00167 m/sec

Multiple Choice

What is the speed of an object that travels 60 meters in 4 seconds?

• 240 m/s
• 15 m/s
• 0.067 m/s
• 15 mph

Multiple Choice

Find the velocity of a plane that traveled 3000 miles west in 5 hours.

• 60 mph
• 6 mph
• 600 mph
• 6000 mph

Multiple Choice

A car accelerates from 15 m/s to 60 m/s in 30 seconds.  What is its acceleration?

• 2 m/s²

• 3 m/s²

• 1.5 m/s²

• 0.75 m/s²

Multiple Choice

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -75 m/s²

• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi/hr²

Multiple Choice

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

Multiple Choice

A bicyclist begins moving with a velocity of 10 m/s and then decreases his velocity to 6 m/s in 2 seconds. What is the acceleration of the bicyclist?

• 4 m/s²
• -4 m/s²
• 2 m/s²
• -2 m/s²