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**By: Nahdir Austin Honors Physics Period 2**

2-D Motion By: Nahdir Austin Honors Physics Period 2

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Vectors Vector: Quantity which is fully described by both magnitude and direction. Examples of vector quantities include: Displacement, velocity, acceleration, and force. Vector quantities are often represented by vector diagrams sometimes called free body diagrams. Requirements of Vector Diagrams A clearly listed scale A vector arrow (with an arrowhead) drawn in a specified direction. The vectors magnitude and direction should be clearly stated.

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Projectile Motion Projectile: Object that is only act upon by the force of gravity. Examples of projectiles include: Objects dropped, thrown vertically upward, and thrown upwards on an angle. A projectile is any object which once projected or dropped continues in motion by its own inertia and is influenced only by the downward force of gravity. Gravity influences the vertical motion, thus causing vertical acceleration. Due to the absence of horizontal forces projectiles remain in motion with a constant velocity.

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**Important facts of 2-D motion**

Rate of acceleration is always 9.8m/s2 For problem solving you can use the equations linear of motion, trigonometry, Pythagorean theorem, and the equations for vertical and horizontal components of velocity. When a projectile is launched in an upward direction the maximum height equals zero velocity. Displacement is the distance from the initial point to the final point, it is not the same as distance traveled. When the displacement is in an upward direction, such as at the top of a cliff, it is a negative quantity.

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**Important Terms Velocity: Rate of change with respect to time**

Displacement: distance from the initial point to the final point Acceleration: Rate at which an object changes its velocity. Vector: A quantity that has both magnitude and direction. Scalar: A quantity with only magnitude. Resultant: The sum of two or more vectors.

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