Speed- the distance an object travels in a certain amount of time (Speed is a scalar quantity because it is only characterized by MAGNITUDE).
Formula: Speed equals distance divided by time
Example: 16 km/ 40 min X 120 min/ 2 hours = 48 km/hour
Velocity- the speed and direction of an object's motion (Velocity is a vector quantity because it can be described by MAGNITUDE and DIRECTION). Velocity is the most accurate way to describe the motion of an object.
Example: 48 km/hour NORTH
Acceleration- the rate an which velocity changes (vector quantity).
Formula: Acceleration equals final velocity minus starting velocity divided by time
Example: 20 m/s - 8 m/s= 12m/s
12 m/s / 3s = 4 m/s / s =4 m/s
-Postive acceleration occurs when the speed of an object increases.
-Negative acceleration occurs when the speed of an object decreases.
Force- a push or pull that alters the direction and motion of an object.
Formula: Newton equals 1 kg times 1 m/s
Friction- the resisting force created when objects in motion come in contact with one another.
-FLUID FRICTION is the friction affecting objects in flight.
Interia- the tendency for an object to resist a change in motion.
Momentum- does not change unless there is a change in velocity or mass.
Formula: Momentum equals mass X velocity
Pressure- a force exerted on a surface.
Formula: Pressure equals force divided by area
-Pressure is measured in pascals.