Speed and Acceleration

 PART I
1. Average speed and instantaneous speed are two very different things. Average speed is the average speed that you went during a distance over a period of time, while instantaneous speed is the speed that you are going at a particular moment in time. When looking at the speedometer in a car, you are reading the instantaneous speed of the car.

2. Constant speed is when you are going the same speed throughout the entire trip, and not accelerating. The object would go 300 m.

3. Acceleration is a change in velocity over a certain period of time. The formula for acceleration as follows:     a= (Vf-Vi)/t
Three different units are m/s/s, m/s^2, km/hr/s
The car would be going 28 m/s

PART II
1. The relationship between the slope on a position-time graph and velocity is that they are the same thing. The slope equals the velocity of the object. If the slope increases, so does the velocity.

2. For exercise one, the answer would be -3.0 m/s. For exercise 2, the answer would be 4.0 m/s. To calculate the velocity of a moving object between two points on a graph, you just use the formula Y1 - Y2 divided by X1 - X2.

3. The slope of a velocity-time graph tells you the average acceleration. On a velocity-time graph, if the slope is positive (going up), then we know that if the object is accelerating, while if the slope is negative (going down), then we know that the objects is decelerating.
Exercise 1: C, D, and H


PART III
1. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall.
All free-falling objects on Earth accelerate downwards at a rate of 9.8 m/s/s.

2. From the graphs shown, I know that the object is increasing in acceleration.