Momentum
Text book Physics 4/5 page 168 to 172
Vimeo -- Momentum cartoon (no words)
Video -- What is momentum?
Physics 4/5 "Conservation of momentum": Read pages 168 to 170
- Answer the following questions with complete sentences in your notebook.
1. What is momentum?
2. Is momentum a vector or scalar quantity. What does this mean?
3. How can you calculate momentum "p" of an object?
4. What are the units of momentum?
5. How can you change the momentum of an object?
- Watch Space station - Conservation of momentum
6. When two objects collide, what happens to the momentum? Where does it go?
7. What is the "law of conservation of linear momentum"?
8. From page 170, draw a labelled rocket with a. arrows to show the size and direction of momentum on the gas and on the rocket.
b. arrows to show the size and direction of forces on the rocket only.
9. Try questions 1 to 7 on page 172 of Physics-4/5
Calculating the force acting on an object in a collision
Readings: Physics classroom momentum in collisions
Youtube -- Momentum in car crashes
When an object has a collision its momentum changes due to forces acting on the objects. The momentum change is called the "Impulse" and can be expressed as follows.
Momentum change = Impulse = mass x change in velocity
It can also be shown as Impulse = Force x time
Explanation:
As you know already, Force equals mass x acceleration. F=ma
Acceleration equals velocity divided by time. a = v/t
Therefore, F=mv/t
In words, Force = mass x change in velocity divided by time. This is the force imparted as an object decelerates in a crash or collision.
When you multiply by the time it takes for the collision to happen or for the velocity to change you get the change in momentum or Impulse only. Change in momentum = Impulse = Force x time
To calculate the force imparted in a collision then use the following equation:
More correctly we would write it as F = |(mv - mu)|/t
u : is the initial velocity and mu : is the initial momentum
v : is the final velocity and mv : is the final momentum
To calculate the "change in momentum" or "Impulse" then use the following equation:
Impulse = F x t
F : Force imparted in a collision
t : time for collision to happen or time for velocity to complete its change
Vimeo -- Momentum cartoon (no words)
Video -- What is momentum?
Physics 4/5 "Conservation of momentum": Read pages 168 to 170
- Answer the following questions with complete sentences in your notebook.
1. What is momentum?
2. Is momentum a vector or scalar quantity. What does this mean?
3. How can you calculate momentum "p" of an object?
4. What are the units of momentum?
5. How can you change the momentum of an object?
- Watch Space station - Conservation of momentum
6. When two objects collide, what happens to the momentum? Where does it go?
7. What is the "law of conservation of linear momentum"?
8. From page 170, draw a labelled rocket with a. arrows to show the size and direction of momentum on the gas and on the rocket.
b. arrows to show the size and direction of forces on the rocket only.
9. Try questions 1 to 7 on page 172 of Physics-4/5
Calculating the force acting on an object in a collision
Readings: Physics classroom momentum in collisions
Youtube -- Momentum in car crashes
When an object has a collision its momentum changes due to forces acting on the objects. The momentum change is called the "Impulse" and can be expressed as follows.
Momentum change = Impulse = mass x change in velocity
It can also be shown as Impulse = Force x time
Explanation:
As you know already, Force equals mass x acceleration. F=ma
Acceleration equals velocity divided by time. a = v/t
Therefore, F=mv/t
In words, Force = mass x change in velocity divided by time. This is the force imparted as an object decelerates in a crash or collision.
When you multiply by the time it takes for the collision to happen or for the velocity to change you get the change in momentum or Impulse only. Change in momentum = Impulse = Force x time
To calculate the force imparted in a collision then use the following equation:
More correctly we would write it as F = |(mv - mu)|/t
u : is the initial velocity and mu : is the initial momentum
v : is the final velocity and mv : is the final momentum
To calculate the "change in momentum" or "Impulse" then use the following equation:
Impulse = F x t
F : Force imparted in a collision
t : time for collision to happen or time for velocity to complete its change