Transcript Newton’s 2nd Law of Motion

Newton’s
Motion
Ch 3 Sect 1
nd
2
Law of
Review

Speed


Velocity


Definition
Mass


Definition
Acceleration


Definition
Definition
Force

Definition
Force, Mass and Acceleration

Force, mass, and acc are related because
they all affect each other

Acceleration of an object depends on its mass
and the force that is being applied to it
Force, Mass and Acc (Cont)

The more mass an object has the more force
required to move it
8 Newtons
5
Kg
16 Newtons
10
kilograms
Force, Mass and Acc (Cont)

If an object has more force applied to it then it
will accelerate quicker
10 Newtons
1,000
grams
20 Newtons
1,000
grams
Force, Mass and Acceleration
(cont)

Acceleration = Net Force (N)
Mass (Kg)
A net force of 400 newtons was applied to
an object that has a mass of 2000
kilograms, what was its acceleration?
Newton’s

nd
2
Law of Motion
A net force acting on an object will cause the
object to accelerate in the direction of the net
force

If you push something with enough force to move
it, then it is going to move in the direction you are
pushing it!
Friction
Friction is the force that opposes motion
between two objects
– When objects are touching they naturally
cause a resistance in motion
– Friction occurs because microwelds form
between microscopic bumps
– Microbumps
Types of Friction
There are 3 types of friction that you will
need to know for the test
1. Static friction-friction that occurs between
things that are not moving
2. Sliding friction-friction that occurs when one
object is sliding over another object
3. Rolling friction-friction that occurs when one
object is rolling over another object
Air Resistance
Air resistance-the force that opposes
motion when objects are moving through
air
– Air resistance can happen when something is
falling or moving
– forces
Air Resistance
Air resistance is determined by the speed
size and shape of an object
In a vacuum (which has no air in it) all
objects will fall at the same rate of speed
Terminal Velocity
Terminal velocity happens when
gravitational force and air resistance reach
there maximum ability on something that is
falling
– Gravity is pulling it down as fast as it can
– There is the most air resistance possible
going against it
– The object is falling as fast as it can possibly
fall