NOTECARDS Turn each slide into a flashcard – title is the “blank side” and text box is the “lined side”

MOTION All matter in the universe is constantly in motion Something is in motion if it is changing position. When an object moves from one location to another, it is changing position. An object changes position if it moves relative to a reference point.

DISPLACEMENT Displacement includes the distance between the starting and ending points and the direction in which you travel.

SPEED Speed is the distance traveled divided by the time taken to travel the distance. the SI unit of speed is the m/s Average speed is found by dividing the total distance traveled by the time taken An object in motion can change speeds many times as it speeds up or slows down.

INSTANTENOUS SPEED The speed of an object at one instant of time is the object's instantaneous speed.

DISTANCE-TIME GRAPH You can represent the motion of an object with a distance-time graph time is plotted on the horizontal X axis, and distance is plotted on the vertical Y axis. A steeper line on the distance-time graph represents a greater speed A horizontal line on the distance-time graph means that no change in position occurs

VELOCITY The velocity of an object is the speed of the object and direction of its motion Velocity has the same units as speed, but it also includes the direction of motion The velocity of an object can change if the object's speed changes, its direction of motion changes, or they both change Displacement/time = velocity

ACCELERATION Acceleration is the change in velocity divided by the time it takes for the change to occur Acceleration has a direction If an object speeds up, the acceleration is in the direction that the object is moving If an object slows down, the acceleration is opposite to the direction that the object is moving acceleration has units of meters per second squared (m/s 2 )

ACCELERATION (speeding up) When an object that is already in motion speeds up, it also is accelerating When the speed of an object increases, it is accelerating

ACCELERATION (slowing down) Acceleration occurs when an object slows down (negative acceleration = deceleration = acceleration) During each time interval, the object travels a smaller distance, so its speed is decreasing

ACCELERATION (pos) When you speed up, your final speed always will be greater than your initial speed - So subtracting your initial speed from your final speed gives a positive number - As a result, your acceleration is positive when you are speeding up

ACCELERATION (neg) When your final speed is less than your initial speed, your acceleration is negative - Therefore, your acceleration is negative when you slow down

SPEED (VELOCITY) TIME GRAPH speed is plotted on the vertical X axis and time on the horizontal Y axis An object that is speeding up will have a line on a speed-time graph that slopes upward An object that is slowing down will have a line on a speed-time graph that slopes downward A horizontal line on the speed-time graph represents an acceleration of zero or constant speed