Motion

• Reference Point is the starting point or the origin for measuring motion.
• Motion is a continuous change in position with respect to a reference point for a particular time interval.
• Distance is the total length of the entire path that the person/object traveled from one place to another.
• Scalar quantity is specified by a magnitude alone, a single number indicating size, magnitude, or dimension.
• Displacement is the shortest distance between the initial and final positions.
• Vector Quantity is a quantity that has both magnitude and a direction.
• Speed refers to a show far an object moves in a given time interval.
• Speed is a scalar quantity.
• Average Speed represents the speed of the object throughout its travel.
• Instantaneous Speed refers to the speed of the object at a particular time.
• Speedometer is a device used to measure the instantaneous speed of a vehicle.
• Velocity is the speed with direction. It is a vector quantity.
• Acceleration refers to the rate of change in speed or velocity of an object.
• Positive Acceleration is the increase in speed or velocity.
• Deceleration is the decrease in speed or velocity.
• Can displacement be equal to distance?

  Yes, when the person or object traveled on a straight line.
• How can we say that an object is accelerating?

  The speed and direction of an object is changing.