AST101H5 Chapter Notes - Chapter 4: Net Force, Orbital Period, Figure Skating
Document Summary
Speed tells us how fast an object will go in a certain amount of time. Velocity tells us both the speed and the direction. Acceleration an object has acceleration if its velocity is changing in anyway, whether its speed or direction. In science, accelerating is used when you are slowing down or turning, not just motion. Slowing down occurs when acceleration is in a direct opposite to the motion acceleration = negative, causing velocity to decrease. Turning changes your velocity because it changes the direction which you are moving even if your speed is constant. You don"t feel effects when moving at a constant speed. Galileo demonstrated that gravity accelerates all objects by the same amount, regardless of their mass. Air resistance causes a difference of acceleration: if you dropped an object on the moon, where there is no air, they would both fall at exactly the same rate.
