PHYSICAL SCIENCE 10- QUARTER 1- MODULE 1 ACTIVITY ASSIGNMENT, Assignments of Earth science

Download PHYSICAL SCIENCE 10- QUARTER 1- MODULE 1 ACTIVITY ASSIGNMENT and more Assignments Earth science in PDF only on Docsity! SCIENCE 10 - ACCELERATION PREPARED BY: KENT HAROLD BUENSUCESO 10.4.1 Acceleration Since velocity is a vector, acceleration is also a vector. Acceleration does not provide any information about a motion, but only about how the motion changes. It is not possible to tell how fast an object is moving or in which direction from the acceleration. Like velocity, acceleration can be negative or positive. We see that when the sign of the acceleration and the velocity are the same, the object is speeding up. If both velocity and acceleration are positive, the object is speeding up in a positive direction. If both velocity and acceleration are negative, the object is speeding up in a negative direction. If velocity is positive and acceleration is negative, then the object is slowing down. Similarly, if the velocity is negative and the acceleration is positive the object is slowing down. This is illustrated in the following worked example. Exercise 10.4.1: Acceleration A car accelerates uniformly from an initial velocity of 2 m·s −1 to a nal velocity of 10 m·s 1 in 8 seconds. It then slows down uniformly to a nal velocity of 4 m·s −1 in 6 seconds. Calculate the acceleration of the car during the rst 8 seconds and during the last 6 seconds. TIP: Acceleration does not tell us about the direction of the motion. Acceleration only tells us how the velocity changes. TIP: Deceleration Avoid the use of the word deceleration to refer to a negative acceleration. This word usually means slowing down and it is possible for an object to slow down with both a positive and negative acceleration, because the sign of the velocity of the object must also be taken into account to determine whether the body is slowing down or not.