Momentum
Momentum April-05-12 4:12 PM
What do you think of when you hear the word momentum? What are some things that can affect an object's momentum? How do they affect momentum? Which one would you prefer being thrown at you? • Sponge • Brick
Momentum Page 1
Its mass makes a difference. Which would you rather experience? • Dropping a bullet on your foot • Firing a bullet at your foot
Velocity makes a difference.
An object with little mass but with high velocity can be a threat. Examples? An object with little velocity but great Momentum Page 2
An object with little velocity but great mass can be a threat. Examples? The product of velocity and mass is called momentum. Momentum = mass x velocity (kg m/s) (kg) (m/s) ρ=mxv
If I have a car that can only travel at 50 km/h, how can I change its momentum? You can change an object's mass and/or velocity to change its momentum. (mv) or Momentum Page 3
(mv) or = mv (if its mass doesn't change) Expanded: = m(v2-v1) Compare: Tennis ball vs. bowling ball - can these objects have the same momentum? Why? Examples: A car travels at 200 m/s. Its mass is 1000 kg. What is its momentum? How fast would a 5 kg bowling ball have to travel to gain the same momentum? Challenge: The Kaiser Bridge, located in Coquitlam, can only hold 1000 kg, the exact weight of your truck. Your truck makes it halfway and stops. A bird lands on the truck. Does the bridge collapse? 2*105 kg*m/s
4*104 m/s Momentum Page 4
4*104 m/s No, your truck uses up some of the gas, reducing the weight. Homework: Read p. 175-178 Pg. 2 of package
Momentum Page 5
What do you think of when you hear the word momentum? What are some things that can affect an object's momentum? How do they affect momentum? Which one would you prefer being thrown at you? • Sponge • Brick
Momentum Page 1
Its mass makes a difference. Which would you rather experience? • Dropping a bullet on your foot • Firing a bullet at your foot
Velocity makes a difference.
An object with little mass but with high velocity can be a threat. Examples? An object with little velocity but great Momentum Page 2
An object with little velocity but great mass can be a threat. Examples? The product of velocity and mass is called momentum. Momentum = mass x velocity (kg m/s) (kg) (m/s) ρ=mxv
If I have a car that can only travel at 50 km/h, how can I change its momentum? You can change an object's mass and/or velocity to change its momentum. (mv) or Momentum Page 3
(mv) or = mv (if its mass doesn't change) Expanded: = m(v2-v1) Compare: Tennis ball vs. bowling ball - can these objects have the same momentum? Why? Examples: A car travels at 200 m/s. Its mass is 1000 kg. What is its momentum? How fast would a 5 kg bowling ball have to travel to gain the same momentum? Challenge: The Kaiser Bridge, located in Coquitlam, can only hold 1000 kg, the exact weight of your truck. Your truck makes it halfway and stops. A bird lands on the truck. Does the bridge collapse? 2*105 kg*m/s
4*104 m/s Momentum Page 4
4*104 m/s No, your truck uses up some of the gas, reducing the weight. Homework: Read p. 175-178 Pg. 2 of package
Momentum Page 5
