Motion.

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Presentation transcript:

Motion

Learning Scale – I can … 4 – Design an experiment to demonstrate how forces affect the motion of an object. 3 – Describe and explain that an unbalanced force changes an object’s speed and/or direction. - Interpret & analyze distance-time graphs. 2 - Calculate the speed, time, and distance of a moving object. 1 – Describe how forces affect the motion of an object.

Describing Motion An object is in motion if the distance from another object is changing. A reference point is the starting point you choose to describe the location, or position of an object. Position is an object’s distance and direction from a reference point.

Think Pair Share – Describe how you would get to the bakery.

Distance vs. Displacement Displacement is the distance between the starting point and finish point. Distance is the length traveled.

Speed Constant Speed = speed stays the same Instantaneous Speed = speed at a specific instant in time. Speed changes when you: slow down speed up stop

Velocity Velocity is the speed AND direction of a moving object. Velocity changes when: speed changes direction changes both change

Think Pair Share – Explain this diagram.

Think Pair Share – Differentiate between speed and velocity.

Acceleration Acceleration is a change in velocity during a period of time. Acceleration changes due to a change in speed or a change in direction. Negative acceleration = slowing down Positive acceleration = speeding up

Speed & Velocity Formulas Speed = Distance Time Average Speed = Total Distance Total Time Distance = Speed X Time Time = Distance Speed

An easy way to solve problems D S T

Example An eagle flies 300 m in 12 s, what was its average speed? Speed = distance/time Speed = 300m/12 s Speed = 25 m/s

Practice Problems 1. A mail truck takes 20 s to move between mailboxes that are 10 m apart. What is the average speed of the mail truck? 2. Sound travels 330 m/s. You hear the sound of the bat hitting a home run 0.5 s after you see it. How far away are you?

4. If a train travels 120 km at 30 km/h, how long will it travel? 3. Two cities are 250 km apart. How much time will it take to travel from one city to the other at 100 km/h? 4. If a train travels 120 km at 30 km/h, how long will it travel?

5. Steve swims 10 m in 20 s. What is his average speed?

Learning Scale – I can … 4 – Design an experiment to demonstrate how forces affect the motion of an object. 3 – Describe and explain that an unbalanced force changes an object’s speed and/or direction. - Interpret & analyze distance-time graphs. 2 - Calculate the speed, time, and distance of a moving object. 1 – Describe how forces affect the motion of an object.