MOTION(Kinematics+Dynamics)

What is motion?

This is the change of position of a body or an object relative to time.

Kinematics- The study of motion without forces.

Time(t)- The interval between two otherwise occuring events.

Distance(d)- The lengh between two points

Displacement(s)- This is how far a body or object is from its original position (meters)m.

Speed(v)- The rate of change of distance. Equation: Distance÷Time= m/s

Velocity(u)- The rate of change of displacement. Equation: Displacement÷Time= m/s

Acceleration(a)- The rate of change of velocity. Formula: Velosity÷Time=m/s2

Equations of Kinematics

Speed= Distance÷Time= m/s

Velocity= Displacement÷Time= m/s

Average speed/velocity= Total distance÷Total time

Acceleration= Change in velocity÷Time taken= m/s2

a= v-u÷t

v- final velocity

u- initial velocity

t- time

a- acceleration

Dynamics

Aristotle’s Theory

F∝V

Aristoltle concluded that force is directly proportional to velocity. In other words as force is increased velocity also increases. This would also mean that when a force stops pushing an onject, the object would stop moving (F=O V=O). However this is NOT true. When you stop pushing an object it does not immediately stop moving.

Newton’s Law of Motion

Newton’s First Law:

An object at rest stays at rest or an object in motion stays in constant motion unless acted upon by an external force.

Newton’s Second Law:

Force=ma

Newton’s Third Law:

If object A exerts a force on object B, then object B exerts a force on object A that is equal in size but in the opposite direction.

Inertia: This is the resistance of an object to change its state of motion.