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? 2) How does the motion of a car racing on an oval track change?
Event that involves a change in the position or location of something. When it an object changes its position relative to a reference point Relative – it is described compared to a REFERENCE POINT Motion
Distance • How far an object moves • Measured in meter or kilometers • Shorter distances (m) (1000m = 1km) • Longer distances (km) • Don’t forget about conversion 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 • The distance & direction of an objects change in position from the starting point
Speed • The distance of an object travels per unit of time • Speed = d/t (distance divided by time) Remember Me!!
Constant Speed • Speed that does not change • Instantaneous speed that does not change
Average Speed • 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
SpeedInstantaneous Speed • Speed at any instant
Instantaneous Speed • Speed at a given point in time • When an object speeds up /slows down is changing