#### Transcript Gravity

```Gravity:
A force with which to be
reckoned.
Balanced vs. Unbalanced
Forces
Force = the cause of acceleration or
change in velocity.
Net Force = combination of all the
forces acting on an object.
Balanced - combined forces acting on
an object that produce a net force equal
to 0.
Unbalanced - combined forces acting
on an object that produce a non-zero
net force.
Gravity
Is an attractive force that acts between
any two objects.
Examples:
– Between the Earth and MHS.
– Between The Earth and you.
– Between you and the person sitting
next to you.
The greater the mass of an object the
greater is gravitational attraction.
“Mass”
Is referred to as the amount of matter in an
object.
Ex: Mrs. Bonds mass is about 67
kilograms.
“Free Fall Acceleration”
Occurs when the force of gravity is the
only force acting on an object.
In absence of air resistance, all objects
near the earth’s surface accelerate at a
rate of 9.8 m/s2.
– Gravity (g) = 9.8 m/s2
Weight
Weight is the gravitational force an object
experiences due to its mass.
Your weight is the product of your mass (m)
and the pull of gravity (g).
W = mg
– Weight = mass x free-fall acceleration.
– Ex: Mrs Bonds weight = 67 kg x 9.8 m/s2. This
equals 657 N.
Unit of measurement
Mass: kg
Weight: Newtons
Gravity: 9.8m/s/s
```