momentum-and-impulse-final powerpoint for science

Science ppt for impulse and momentum

1. MOMENTUM

2. Objective
The learners should able to:
Calculate the mass,
velocity and momentum of
an object.

3. Momentum
is what Newton called the
“quantity of motion” or the
“inertia of motion” of an
object.
Is a quantity that
describes an object’s
resistance to stopping

4. All objects have mass; so if an object
is moving, then it has momentum -it
has its mass in motion.
The amount of momentum which
an object has is dependent upon
two variables:
how much matter is moving?
how fast the matter is moving?

5. Momentum
The momentumof an object:
Depends on the object’s mass.
Momentum is directly proportional
to mass.
Depends on the object’s velocity.
Momentum is directly proportional
to velocity.

8. Momentum and Inertia
Inertiais property of mass that
resists changes in velocity; inertia
depends only on mass.
Inertia is a scalar quantity, it has
only magnitude
Momentum is a property of moving
mass that resists changes in a moving
object’s velocity.
Momentum is a vector quantity, it
has magnitude and direction

9. Momentum
In symbols:
p = mv
p
mv
Common units of
momentum:
kg ( m/s)

10. Sample problem
Which has more momentum,
a truck with a mass of
20000kg moving at 30,000
m/s
or a truck with a mass of
10000kg moving at 30,000
m/s?

16. Impulse
The impulseexerted on an object
depends on:
The forceacting on the object.
Impulse is directly proportionalto force.
The timethat the force acts.
Impulse is directly proportionalto time.

19. Impulse
In symbols:
I = Ft
I
Ft

20. Impulse & Momentum
In symbols:
I = Dp

21. Impulse
Impulse is a vectorquantity.
Common units of impulse: N s

29. Conservation of Momentum
Since impulse = change in
momentum, If noimpulseis exerted
on an object, the momentum of the
object will notchange.

30. Conservation of Momentum
If noexternal forcesact on
a system, the total
momentumof the system
will notchange.

31. Conservation of Momentum
Internalforces can never
change the total
momentumof a system.

32. Conservation of Momentum
Momentum
after= Momentum
before

35. Cart and
Brick
In the collision between the cart and the dropped brick,
total system momentum is conserved.
Before the collision, the momentum of the cart is 60
kg*cm/s and the momentum of the dropped brick is 0
kg*cm/s; the total system momentum is 60 kg*cm/s.
After the collision, the momentum of the cart is 20.0
kg*cm/s and the momentum of the dropped brick is 40.0
kg*cm/s; the total system momentum is 60 kg*cm/s. The
momentum of the cart-dropped brick system is conserved.
The momentum lost by the cart (40 kg*cm/s) is gained by
the dropped brick.

50. What type of collision?