Presentation on theme: "Acceleration unit 6.2 year 10. Introduction An often confused quantity, acceleration has a meaning much different than the meaning associated with it."— Presentation transcript:
Acceleration unit 6.2 year 10
Introduction An often confused quantity, acceleration has a meaning much different than the meaning associated with it by sports announcers and other individuals.
Acceleration Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity An object is accelerating if it is changing its velocity.
Acceleration Teacher demonstration As an object fall it accelerates due to the force of gravity.
Constant acceleration Sometimes an accelerating object will change its velocity by the same amount each second. This is referred to as a constant acceleration since the velocity is changing by a constant amount each second.
Calculating the Average Acceleration [ v av ] The average acceleration (a) of any object over a given interval of time (t) can be calculated using the equations
Symbols Δ is the letter Delta from the Greek alphabet. It means a change in. Example: Δt = a change in time
Units Acceleration values are expressed in units of velocity/time. Typical acceleration units include the following: m/s/s km/hr/s ms -2 m/s 2
Acceleration and graphs High acceleration is a rapid increase in speed. The speed–time graph would be a steeper one than if you accelerated at a lesser rate; that is, the slope or gradient of a speed–time graph gives us the rate of acceleration.
Animation Direction of Acceleration and Velocity Direction of Acceleration and Velocity