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# Chapt 2 8th Science

The total distance an object travels divided by the travel time for the whole trip Average Speed
The rate of change of the velocity of an object Acceleration
Forces on an object that are equal in strength but opposite in direction Balanced Forces
Speed that remains the same over time Constant Speed
The distance and direction an object moves from its starting point Displacement
The measure of how far an object has moved Distance
Any push or pull exerted on an object Force
The resistance that one surface or object encounters when moving over another Friction
The tendency of an object to resist change in motion Inertia
Speed of an object at a point in time Instantaneous speed
The change in position relative to a reference point Motion
Speed decreases over time; deceleration Negative acceleration
The sum of all the forces on an object Net force
Speed increases over time Positive acceleration
A measurement that has magnitude only Scalar quantity
Distance divided by time Speed
Forces on an object that result in a net force. They may be in the same direction, or of differing strengths. Unbalanced forces
A measurement that has both direction and magnitude (eg: 50 m/s North) Vector quantity
The speed of an object in a direction Velocity
What type of graph would be used to plot distance versus time? A line graph
What type of speed does a speedometer measure? Instantaneous speed
Is distance a scalar or vector quantity? Scalar
What is the formula for speed? s = d/t
What is the formula for acceleration? a = (Vf - Vi) / t
What type of quantity is displacement? A vector quantity
What does a horizontal line on a graph of velocity versus time mean? The object is traveling at a constant rate of speed; there is zero acceleration.
How does the mass of an object affect its inertia? A change in the mass would change the inertia
What is the relationship of force and motion? It takes force to cause or change motion
When riding a roller-coaster, what changes do you experience? Changes in speed and/or direction
What is Newton’s First Law of Motion? An object in motion will stay in motion until a net force acts on it; an object at rest will remain at rest until a net force acts on it.
In Diagram I (see slides), what is the total distance the professor walks? He walks 4 meters away, and 4 meters back, making his total distance 8 meters.
In Diagram I (see slides), what is the professor's displacement after 10 seconds? His displacement is zero, because he has returned to the same place.
In Diagram I, what is the professor doing during seconds 5 - 7? He is standing still. In a distance vs time graph, a horizontal line means, the object is not moving.
If a car is driving around a track, can it have a constant speed AND a changing velocity? Yes! The velocity would be changing because it includes both speed AND direction, and the vehicle's direction would change.
Describe the person on the train in the Frame of Reference slide from two points of view. The person on the train experiences herself as standing still. To the person on the ground, she is moving rapidly away.
Created by: judi829