Speed, Velocity, Acceleration

Speed, Velocity, & Acceleration

How are they different?

Learning Objective

• Know what speed, velocity, and acceleration are.

• Understand how they are different

• Be able to calculate speed, distance, time, and acceleration

Speed

• Speed is the measure how quickly distance changes with time.

• There are two types of speed: average speed and instantaneous speed.

• Average speed can be found by taking the total distance dividing by total time of travel

• Instantaneous speed is the speed of the object at the specific instant in time.

• Units for speed include mph with SI unit being m/s.

Multiple Choice

Find the speed of Ms. Chen after 40 sec at 8 meters.

• 5m/s

• 8m/s

• 5 mph

• 40 mph

Using Equations to Solve for Speed, Distance, & Time

• Distance = speed x time

• Time = distance / speed

• Speed = distance / time

Multiple Choice

The average speed on 933 is 60mph and it is 30 miles from Whitney to Cleburne. How long will it take to get to Cleburne if I leave at 4pm?

• 5min

• 30 min

• 5hrs

• 30 sec

Velocity

• Velocity of an object is its speed combined with the direction of the motion

• Just add the direction to the speed and you have velocity

• An example ofvelocity would be 70mph south

Vector vs Scaler Quantity

• Velocity is a vector quantity while speed is a scaler quantity

• Vector quantity is a physical quantity that has both size and direction

• Scaler quantity is singular, size or direction.

Multiple Select

Check the correct examples of velocity

• 6km/h

• 4 km/h north

• 70mph

• 70mph east

• 25 feet up

Acceleration

• Acceleration is a measure how quickly velocity changes.

• Acceleration describes the change in velocity over time.

• The SI unit for acceleration is m/s^2

Multiple Choice

Caiden is running down the field at first going 15m/s then after 20 sec is going 30m/s. What is his acceleration?

• .75 mph

• 2m/s

• 0.75m/s² south

• 2mph

Multiple Select

How are speed and velocity different?

• Velocity has direction plus speed

• Speed is scaler while velocity is vector

• change in position

• one is normal and one is weird

Acceleration

• Can be negative (deacceleration)

• Goes in opposite direction of velocity