These last 2 weeks of June was jus fine for me. I have learned a lot from hose days. Physics is not difficult “pala” sabi nga ni sir!
I have leaned all about speed, force distance time length and mass and also their formulas. I need also to study my lessons more and not t depend on sir. Mendoza to make it easier for me o understand /learn faster.
In our class(Mendel) we are noisy and of course energetic learning Physics with sr. Mendoza.
Speed and acceleration:
In describing the motion of objects mathematically, we must draw a clear distinction between the terms speed, velocity, and acceleration. Speed is defined as the rate of covering distance or the distance covered in a given amount of time. Velocity is the speed and the direction of motion. Acceleration is the rate of change of velocity. Speed and acceleration are quite different concepts - an object may be able to attain a high speed, but it does not necessarily have good acceleration, and vice versa.
To calculate the speed of an object, we could measure the amount of time it takes to cover a given distance, and then divide: speed = distance/time. However, the object may not have been moving at a constant rate over the given distance. Thus this calculation gives us the average speed.
That is,average speed = (total distance covered) ÷ (total time)
The speed at a particular point in time is known as the instantaneous speed. This is what is measured by a speedometer or a radar gun. Acceleration is defined as the rate of change of velocity. Since velocity involves both speed and direction, an object accelerates either by changing (increasing or decreasing) its speed or by changing its direction. If an object is moving in a straight line, then acceleration occurs whenever there is a change in speed. Thus if the speed changes from v1 to v2 in a time t, the acceleration a is:
a = (v2 - v1)/t
If the object is not accelerating at a steady rate, then the above equation gives the average acceleration.
