Momentum = the product of mass and velocity = unit is kg m/s
Parti: Find the momentum in each picture:
Moss = 2500 kg
Velocity = 25m's
Mass=320
Velocity=12ms
Moss - 85 kg
speed=&m's
Changing the Momentum:
To change the momentum of an object, a
must be applied to the object. This action will
cause the
of the object to change. When the velocity increases, the momentum will
When the velocity
the momentum will decrease. The change in the
momentum of the object is called IMPULSE.

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?