PHYSICS: MECHANICS Flashcards
Physics
-aim is to understand the physical laws and principles that influence every aspect of daily life
-physicians examine the behavior and interaction of energy and matter in the universe to increase their understanding of everyday phenomena
Displacement
-the distance that an object is from the starting point, measured in units of length
Motion
-when an object is in motion, its displacement is constantly changing
-motion is displacement, velocity (speed), and acceleration
Speed
Speed= distance traveled/time
Velocity
Speed in a given direction; therefore tells us two things about a moving object: its speed and direction
Acceleration
-rate of change in velocity
-acceleration refers to any change of velocity, positive or negative
-deceleration is sometimes used to refer to negative acceleration or decrease in velocity and can cause a change in direction
-acceleration = final velocity - original velocity / time
-velocity and acceleration can both be described using vectors because they have both magnitude and direction
-speed is not a vector quantity because it does not specify direction
Momentum
-an object traveling in a specific velocity has a quantity called momentum
-all moving objects have momentum
-momentum= mass x velocity
-the mass of an object is the amount of matter in it
Conservation of momentum
-one of the main laws of classical physics states that the total momentum of an isolated system is always constant
-during a collision between two bodies, the momentum of each body changes, but the total momentum is conserved
-none of the momentum is lost one object may lose momentum, but the momentum lost by the one object is gained by the other
-when a moving object hits a stable object, such as a bullet hitting a wall, the bullet delivers an impulse to the wall
-the impulse is said to be the change in the objects momentum
