Transcript Momentum and Impulse NOTES PPT

Physics
Ms. Koerner 2015
Momentum
Momentum is mass in motion. Momentum
depends on mass and velocity.
The formula for calculating momentum is
𝑝 = 𝑚𝑣
where p = momentum, m = mass, and
v = velocity.
Momentum
The unit for momentum is Newton second (Ns).
The unit for mass is kilogram (kg), and unit for
velocity is meters per second (m/s).
Momentum has direction and magnitude so it is
a vector quantity.
Impulse
An impulse is a force exerted over a period of time. The
formula for Impulse is
𝐼 = 𝐹∆𝑡
Where I = impulse, F = force , and Δt = change in time
(final t – initial t)
The Unit for Impulse is Newton second or kilogram meter
per second (kg·m/s),
Force is Newtons (N), and time is measured in seconds
(s).
Impulse
The unit for Impulse is Newton second or
kilogram meter per second (kg·m/s),
Force is Newtons (N), and time is measured in
seconds (s).
Impulse and Momentum
To stop an object, you apply a force against its
motion for a given period of time. The impulsemomentum theorem states that
Impulse = change in momentum.
As a result of this another formula for Impulse is
𝐼 = 𝑚∆𝑣
Where I = impulse, m = mass and
∆v = change in velocity (final v – initial v)
Why wear a hard hat?
Hard hats and bumpers increase the time of
collision, thereby decreasing the force
experienced by the object being protected.
• https://youtu.be/OcYD80QBD7Y
Conservation of Momentum
The Law of Conservation of Momentum states
that momentum remains the same in a system,
unless there is an external force.
Momentum can be transferred from one object
to another in a collision.
𝑝𝑏𝑒𝑓𝑜𝑟𝑒 = 𝑝𝑎𝑓𝑡𝑒𝑟
Elastic Collisions
• Objects bounce off each other
Inelastic Collisions
• Objects stick together