# The Laws of motion.

## Presentation on theme: "The Laws of motion."— Presentation transcript:

The Laws of motion

KEY CONCEPTS AND QUESTIONS- objectives
What are some contact forces and some noncontact forces? What is the law of universal gravitation? How does friction affect the motion of two objects? What are the different types of friction?

VOCABULARY force friction contact force noncontact force gravity mass
weight

GRAVITY AND FRICTION Force- a push or pull applied to an object. (N)
Contact - a force on one object by another object that is touching it. Noncontact – a force applied to an object without touching it- gravity, electric force, magnet to metal

GRAVITY Attractive force that exists between all objects that have mass. Law of Universal Gravitation – The strength of the gravitational force depends on the mass and distance of each object. WEIGHT- The gravitational force exerted on an object (measured in Newtons)

FRICTION TYPE OF FRICTION DESCRIPTION EXAMPLE STATIC
TWO SURFACES ARE NOT MOVING PAST EACH OTHER PUSHING HEAVY OBJECT SLIDING TWO SURFACES SLIDE PAST EACH OTHER SLEDDING DOWN A HILL ROLLING ROLLING OBJECT AND SURFACE IT ROLLS UPON SKATEBOARD MOVING ON GROUND FLUID OBJECT MOVES THROUGH A FLUID- GAS OR LIQUID SKYDIVING FRICTION IT IS A FORCE THAT RESISTS THE MOTION OF TWO SURFACES THAT ARE TOUCHING

AIR RESISTANCE IS A FRICTION-LIKE FORCE THAT OPPOSES MOTION OF OBJECTS THAT MOVE THROUGH AIR. DEPENDS ON SPEED, SIZE, AND SHAPE OF OBJECT.