Physics - Freefall / Projectile Motion / Kinematics

Kinematics

• It's the branch of classical mechanics that describes the motion of points, objects, and systems of groups of objects, without reference to the causes of motion.

• “Motion in one direction”

Distance (d)

• It is the total length of the path traveled by an object without any regard to direction.

• It is a Scalar quantity because it is always POSITIVE.

• d = speed x time

Displacement (Δx)

• It refers to “How far out the place an object is”,

• object’s overall change in position.

• It is a Vector quantity because it can be POSITIVE or NEGATIVE, direction is important.

• Δx = Final position-Initial position

Speed (s)

• It refers to “How fast an object is moving” .

• It can be thought of as the rate of which an object covers distance.

• Scalar Quantity

• s = distance/time

Velocity (v)

• It is a displacement per unit of time and has a specific direction

• it contains the direction as well as the magnitude of a moving object

• the rate at which an object changes its position

• Vector Quantity

• v = displacement/time

Acceleration (a)

• speed and direction

• It is the rate of change of velocity with time.

• It is a Vector quantity and can be calculated as the change in velocity divided by the time taken.

• a = Δv/Δt. 

9.8m/s²

Acceleration due to gravity formula?

Freefall

• The idealized motion of a falling object which is acted upon only by the force of gravity

• David Scott

Projectile Motion

• Combination of uniform horizontal motion and free fall

• Time and speed symmetries in the vertical component

Velocity (v)

Equation?

Acceleration (a)

Equation?

Displacement (Δx)

Equation?

Distance (d)

Equation?

Speed (s)

Equation?

Trajectory

curved path of a projectile

Derived Equations (remember)

Time Symmetry

• The time required for the object to reach its maximum height equals the time for it to return to its starting point

Speed Symmetry

• At any displacement above the point of release, the speed of the body during the upward trip equals the speed during the downward trip