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33 Cards in this Set
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Vectors 
Physical quantities that have both magnitude and direction 

Scalars 
Quantities without direction. Scalar quantities may be a magnitude of vectors. 

How is vector subtraction accomplished? 
By changing the direction of the subtracted vector and then following the procedures for vector addition. 

How is vector addition accomplished? 
Using tip to tail method or by breaking a vector into its components and using Pythagorean Theorem. 

Dot product 
The product of the vectors’ magnitudes and the cosine of the angle between them. 

Cross Product 
The product of the vectors’ magnitudes and the sine of the angle between them. 

Displacement 
The vector representation of a change in position. 

Distance 
Scalar quantity that reflects the path traveled 

Velocity 
The vector representation of the change in displacement with respect to time 

Average velocity 
Total displacement divided by total time. 

Average speed 
The total distance traveled divided by the total time 

Instantaneous velocity 
Limit of the change in displacement over time as the change in time approaches zero. 

Instantaneous speed 
The magnitude of the instantaneous velocity vector. 

Force 
Any push or pool that has the potential to result in acceleration. 

Gravity 
The attractive force between two objects as a result of their masses. 

Friction 
A force that opposes motion as a function of electrostatic interactions at the surface between two objects. 

Static friction 
Exists between two objects that are not in motion relative to each other. 

Kinetic friction 
Exist between two objects that are in motion relative to each other. 

Coefficient of friction 
Depends on two materials in contact. The coefficient of static friction is always higher than the coefficient of kinetic friction. 

Mass 
A measure of inertia of an object. 

Weight 
The force experienced by a given mass due to the gravitational attraction to earth. 

Acceleration 
The vector representation of the change in velocity over time. 

The Law of Inertia 
Newton’s 1st Law an object will remain at rest or move with a constant velocity if there is no net force on it. 

Newton’s Second Law 
Any acceleration is the result of the sum of the forces acting upon the object and its mass. 

Newton’s Third Law 
Any two objects interacting with one another experience equal and opposite forces as a result of the interaction. 

Linear motion 
Includes free fall and motion in which the velocity and acceleration vectors are parallel or anti parallel. 

Projectile motion 
Contains both an x and y component. Assuming negligible air resistance, the only force acting on the object is gravity. 

Inclined planes 
An example of twodimensional movement. Easiest to consider the dimensions as being parallel and perpendicular to the surface of the plane. 

Circular motion 
Has radial and tangential dimensions. In uniform circular motion,the only force is the centripetal force. 

Free body diagrams 
Representations of the forces acting on an object. Useful for equilibrium and dynamics problems. 

Rotational equilibrium 
Occurs in the absence of any net torques acting on an object.
An object in rotational equilibrium has a constant angular velocity. 

Righthandrule 
Find direction once we have the magnitude x and y 

SI unit for force 
Newton kg•m over ssquared 