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# 1.) Which animal ran faster? 2) How does the motion of a car racing on an oval track change? - PowerPoint PPT Presentation

DO NOW!!. In Aesop’s fable “The Tortoise and the Hare” a tortoise and a hare run have a race. The hare bounds far ahead of the tortoise and then, sure of victory, lies down to rest under a tree. The tortoise passes the resting hare and wins the race. 1.) Which animal ran faster?

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In Aesop’s fable “The Tortoise and the Hare” a tortoise and a hare run have a race. The hare bounds far ahead of the tortoise and then, sure of victory, lies down to rest under a tree. The tortoise passes the resting hare and wins the race.

1.) Which animal ran faster?

2) How does the motion of a car racing on an oval track change?

### Ch. 2 / Sec. 1DescribingMotion

When it an object changes its position relative to a reference point

Relative – it is described compared to a REFERENCE POINT

Motion

Distance something.

• How far an object moves

• Measured in meter or kilometers

• Shorter distances (m) (1000m = 1km)

• Longer distances (km)

Examples of UsesApproximate Speed

km/srocket escaping Earth's atmosphere11.2 km/s

km/hcar traveling at highway speed100 km/h

cm/yrgeological plate movements2cm/yr - 17 cm/yr

Displacement something.

• The distance & direction of an objects change in position from the starting point

Speed something.

• The distance of an object travels per unit of time

• Speed = d/t (distance divided by time)

Remember Me!!

Constant Speed something.

• Speed that does not change

• Instantaneous speed that does not change

Average Speed something.

• Total distance traveled divided by the total time of travel

• Describes speed of motion when it is changing

• Can be calculated using relationships among speed, distance and time

• Speed = total distance/ total travel time

• Still use triangle

Speed something. Instantaneous Speed

• Speed at any instant

Instantaneous Speed something.

• Speed at a given point in time

• When an object speeds up /slows down is changing