a car speedometer measures speed, not velocity. you need to know the direction the car is traveling in order to measure the velocity, and a speedometer does not measure the direction of travel

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yes. velocity is two parts (speed and direction). if direction varies while speed is constant or vice versa, velocity will also vary. ex: car going at constant speed around a curve, or a carousel
no. velocity is speed and direction. since speed is a component of velocity, if its speed changes, velocity must also change. ex: m/s
if one object has a greater speed than a 2nd object, does the 1st necessarily have a greater acceleration?
no; acceleration is the rate of increase/decrease in the velocity of an object. An object as high velocity will have no acceleration if its velocity is not changing. ex: baseball thrown into the air
Compare the acceleration of a motorcycle that accelerates from 80 km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest to 10 km/h in the same time
both the motorcycle and the bicycle have the same acceleration (10 km/h). the motorcycle"s higher speed is irrevelant
explain in detail the differences between distance and displacement and how these terms are related to speed and velocity
-distance is the km or m traveled without regard to direction-displacement is the change in position of a body-speed: distance (total time, no direction)-velocity: change in position (delta x) in a given direction/total time
Explain how the same trip, such as a 3 mi run from your front door to your front door could have an average speed but a zero average velocity
speed may be constant but have a zero average velocity because there was no change in position, the end point of the 3 mi run was the same position as the start point of that run
acceleration is the rate of change of velocityex: a car going 15 m/s accelerates for 4 s and is now at a new velocity of 20 m/s
change in position of a body. how far a body is from a starting point in a straight line in a given direction. used when calculating the velocity of a body




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