Presentation on theme: "Momentum Study Guide Momentum Study Guide. What equation is used to directly calculate momentum? p = mv."— Presentation transcript:
Momentum Study Guide Momentum Study Guide
What equation is used to directly calculate momentum? p = mv
There are two moving 10 kg objects. Object 1 has velocity of 5m/s Object 2 has velocity of 2.5m/s Which has the greater momentum? Object 1
crog/movies/irabs.dcr A roller coaster works by putting in an initial energy to get the cart to the top. When does the cart have the greatest momentum? At the bottom
I bounce a rubber ball off of the floor and it returns to my hand with the same velocity. How would you describe the magnitude of the ball’s momentum? Stayed the Same
Watch the following experiment. Teacher stands up from chair Describe the momentum of the chair. P i = 0 P f > 0
If the time that a force is exerted on an object is large then the momentum will be? Large
If the force is exerted on an object is small, but is exerted for a long time then the momentum will be? Large
A ball with a momentum of 6.0 kg·m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball’s momentum? Δp = p f -p i Δp = -6.0 –(6.0) = -12.0kg*m/s
A 0.25 kg baseball is pitched with a velocity of 50 m/s and is then batted to the pitcher with a velocity of 70 m/s. What is the magnitude of change in the ball’s momentum? Δp = mΔv Δp = m(v f -v i )
Momentum The impulse experienced by a body is equivalent to the body’s change in I = Δp
A player at first base catches a throw traveling 22 m/s. The baseball, which has a mass of 0.21 kg, comes to a complete stop in the glove after 0.15 s. Assuming the force of the glove was uniform, what force did the glove exert on the ball? Ft =mv => F = mv/t I =mv What if it asked for impulse?
Newton’s Second Law is commonly expressed as F = ma However, Newton originally expressed it as Ft = mv Prove mathematically that both expression are one in the same.