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## PowerPoint Slideshow about ' Motion' - tender

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Physics

- Science that involves matter and its motion through space and time.
- We just finished Chemistry: Study of the properties and behavior of matter.

Distance and Displacement

- How fast is this lady running?
- Earth spins at 1670 km/hr
- And it is moving around the
sun at 107,000 km/hr

Distance and Displacement

- To describe motion accurately, a frame of reference is necessary.
- Frame of reference is a system of objects who are not moving with respect to one another.
- Ex: Earth is the “stationary” frame of reference when cops measure the speed of our cars.

Measuring Distance

- Distance: the length of a path between two points
- Classroom examples?

Measuring Distance

- The SI unit for measuring distance is the Meter (m).
- WE WILL NOT BE USING MILES, FEET, or INCHES in Science class!!
- Why do we use metric?

Measuring Distance

- Large distances are measured in Kilometers (km).
- One kilometer is equivalent to how many meters?
- One centimeter is one hundredth of a meter!

Measuring Displacement

- What is distance?
- Displacement: The DIRECTION from the starting point and the LENGTH of a straight line from the starting point to the ending point.

Measuring Displacement

- Walk 10 blocks
- Walk 10 blocks north from Kroger

Combining Displacements

- Vector: Quantity that has magnitude and direction.
- Magnitude can be size, length, or amount.
- Arrows are used to represent vectors.
- Size of the arrow corresponds to magnitude (size)

Combining Displacements

- Vector addition is the combining of vector magnitudes and directions.
- Add displacements using vector addition.

Combining Displacements

- Displacements along a straight line.

Displacement that isn’t Along a Straight Path

- Resultant Vectors: Vector sum of 2 or more vectors.

Speed and Velocity

- Speed
- Average speed
- Instantaneous speed

- Graphing Motion
- Velocity
- Combining Velocities

Speed

- Speed: The ratio of the distance an object moves compared to the amount of time the object moves.
- SI unit for speed is meters/second (m/s).
- If a car travels 40 km in 5 hours, how fast is the car moving?

Speed

- Average Speed: Computed for the ENTIRE DURATION of the trip.
- Instantaneous Speed: Measured at a particular instance.

Average Speed

- Average speed (v) = total distance traveled (d) divided by the total time (t).

Instantaneous Speed

- Instantaneous Speed: The rate at which an object is moving at a given moment in time.
- A car’s speedometer measures instantaneous speed.

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