A reference point is a stationary object used to compare the position of another object. An example : The car is stationary relative to the Sun, as its position does not change while the Sun moves across the sky.
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SPEED / VELOCITY / ACCELERATION
VELOCITY : Definition: Speed with a direction (e.g., 60 km/h north).Example: A car traveling 60 km/h north.
SPEED : Definition: Distance traveled per unit of time.Example: A car moving at 60 km/h.
ACCELERATION : Definition: The change in velocity over time.Example: A car increasing speed from 20 km/h to 60 km/h in 5 seconds.
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NEWTON'S LAWS
Newton's First Law (Law of Inertia)An object at rest stays at rest, and an object in motion stays in motion unless acted on by a force.Example: A soccer ball won’t move until kicked.
Newton's Second Law (F=ma)The force acting on an object is equal to the mass of that object times its acceleration.Example: Pushing a heavy box requires more force than pushing a light box.
Newton's Third Law (Action-Reaction)For every action, there is an equal and opposite reaction.Example: When you jump off a small boat, it moves backward.
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