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# Ch. 4 p.p. notes #2

### questions over powerpoint 2

What are the threethings that have to happen for acceleration to occur? an increase in speed, a decrease in speed,and a change in direction.
What is the equaation for acceleration? final velocity(vf) minus initial velocity(vi)time interval(t)
During each second of fall the instantaneous speed of th object increases by how much? ten meters per second
What is the instantaneous speed of an object falling from rest equal to? the acceleration multipliedby the elapsed time.
What is a straight line with constant acceleration at the average of the initial speed and the final speed? the average speed of any moving object
What is the first second of fall when the sum of the initial speed of zero and the final speed of 10 m/s are divided by 2 or 5 m/s? The average speed of a freely falling object
What increases and what remains the same for a freely falling object? Velocity increases and Acceleration remains at a constant rate.
What is the equation for calculating "How far?" distance equals one half gravity times time squared.
What can graphs do to describe the relationships such as velocity and acceleration? They can visually describe the relationship.
What kind of graph shows the speed on the vertical axis and the time on the horizontal axis? A Speed versus time graph
What is the slope of the graph? the vertical change divided by the horizontal change.
What are decreasing acceleration and constant speed called? negative and zero acceleration
What kind of graph shows the distance on the vertical axis and the time on the horizontal axis? Distance versus time graph
What is the result of this graph? a curved line.
What are two terms used to describe this graph? parabolic and nonlinear relationship
What do two objects depend on when they fall freely? the air resistance around them.
What is a certain elapsed time of either speed or velocity? How fast something falls
What is the question that goes with distance? How Far the object has fallen.
Created by: MSeise

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