Physics - constant velocity

si unit of velocity

meter per second

suppose you are given a position versus time graph. the slope of a line drawn tangent to a point on the curve of this graph describes what quantity?

instantaneous velocity

If the position of a car does not change with respect to a fixed framed of reference, describe the motion of the car

at rest

what is the ratio of an object’s displacement to the time interval during which the displacement occured?

average velocity

what is the abbreviation of SI

International system of units

A horse trots past a fencepost located 12m to the left of a gatepost. it then passes another fencepost located 24m to the right of the gatepost 11s later. what is the average velocity of the horse?

36/11 = 3.27 m/s

vector quanities

a physical measurement that possesses both magnitude (size or value) and a direction (displacement and velocity)

scalar quantity

a physical measurement that has magnitude only and no direction (distance and temperature)

Which is the best way to describe the average velocity of an object?

The change in displacement divided by the change in time

Magnitude describes

the size of any measurement with a correct unit.

The speed of sound in air is roughly 1,484 m/s. How far, in meters, would a sound wave travel in 5 seconds? 

7420 meters

A dolphin swims for a distance of 10.0 km.  It travels at a speed of .99 km/min. How many minutes does this take?

10.1mins

(Watch your units) A cyclist travels 18 km east in 30 minutes. What is the cyclist's average velocity in m/s?

10 m/s east

A car travels at a constant speed of 25 m/s for 3 minutes. What distance does the car travel, expressed in kilometers?

4.5 km

Mr. R has one of his runners start at a position of 12 m and they finishes at 47m. What is the runner's displacement?

35m

A skateboarder has an initial position of  -8 m and an overall displacement of 23 m. What is the skateboarder's final position?

15m

Velocity is

a vector

What quantity describes the difference between an object’s initial position and the object’s final position?

displacement

A tree kangaroo climbs on a  branch 4 meters north and then moves along another branch 3 meters west. What is the magnitude of its displacement?

5

A shark travels at an average speed of 20 km/h along a 0.60 km straight segment. How much time does the shark take to travel this segment?

.03 hrs

change in velocity

driving in a circle at 20 mph, slowing down your car for a light, speeding up to merge into a different lane