2-D Motion

 Vectors- Magnitude and Direction

 Vector Addition

Resultant- vector sum of two or more vectors drawn from the tail of the first vector to the head of the second vector.

Direction is expressed as an angle measured counter clockwise. 

Vectors in one direction

·               As long as dimension is the same, vectors can be added.

Projectile Motion

Projectiles are launched or throne into the air

·         Have motion in two dimensions

1.        Vertical component

2.       Horizontal component

Air resistance is ignored

Change in displacement in the vertical direction

·         Δdy=-1/2g(t)²

Change in displacement in the horizontal direction

·         Δdx=vΔt

Change in motion

Force- push or pull

·         Force may be any mechanism that causes or may cause a change in an objects velocity.

·         Velocity changes acceleration

·   F=ma

Field forces- exerted over a distance

1.        Electromagnetic

2.       Electrostatic

1.  Attraction

2. Repulsion

3.       Gravity

Contact Forces- Two objects in physical contact.

1.        Friction

2.       Kicking a ball

·               Forces are vector quantities.

·                     Magnitude and direction

Free body diagrams- Shows all forces at work on an object. Forces are represented as vectors, Act on single point.

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