science investigations. a push or pull on an object units: newton (n) = 1 kg x m/s 2 net force...
TRANSCRIPT
FORCES AND FRICTIONScience Investigations
FORCE
A push or pull on an object Units: Newton (N) = 1 kg x m/s2
Net Force (Fnet) : sum of all of the forces that are acting on an object
Balanced Forces: Fnet = 0 Object is at rest or moving with constant
velocity Unbalanced Forces: Fnet is not equal
to 0, Object is accelerating or decelerating
TYPES OF FORCES
Applied – contact force in the direction the object is moving
Tension- caused by a rope, cable, ect., directed away from the object
Friction- opposes the motion of objects, must have contact
Normal- caused by a surface Force of gravity- force at a distance,
caused by attraction between two objects
TWO TYPES OF FRICTION
Static Friction of an object at rest Greater than kinetic friction (harder to get
an object moving than to keep it moving) Friction is greatest when surfaces are roughHow can you get a car to move that is stuck in
the snow? Kinetic
Friction of a moving object
TYPES OF KINETIC FRICTION
Sliding Two surfaces moving past each other
Rolling Movement of a circular object on a
surface Fluid Friction
Movement of an object through a liquid or gas
Ex. Air resistance