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`        what is impulse how is it different from momentum`
10 years ago

```							Momentum:
The momentum of a body is equal to its mass multiplied by its velocity.Momentum is measured in N-s. and momentum is a  vector quantity.
Impulse:
The impulse of a force is equal to the change in momentum of a body which a force causes. This is also equal to the magnitude of the force multiplied by the length of time the force is applied.
Impulse = change in momentum = force × time
These concepts are merely an outgrowth of          Newton's second law  (Fnet          = m • a),which stated that the acceleration of an          object is directly proportional to the net force acting upon          the object and inversely proportional to the mass of the          object. When combined with the definition of acceleration (a          = change in velocity / time), the following equalities          result.
F=m*a = m*dV/t
If both sides of the above equation are multiplied by the          quantity t, a new equation results.
F*t  = m*dV
This equation          represents one of two primary principles to be used in the          analysis of collisions during this unit. To truly understand          the equation, it is important to understand its meaning in          words. In words, it could be said that the force times the          time equals the mass times the change in velocity. In          physics, the quantity Force • time is known as impulse. And since the          quantity m•v is the momentum, the quantity          m•v          must be the change in momentum.
The equation really says that the : Impulse = change in momentum

Example: To understand the physics of          collisions.
In a collision, an object             experiences a force for a specific amount of time which             results in a change in momentum. The result of the force             acting for the given amount of time is that the object's             mass either speeds up or slows down (or changes             direction). The impulse experienced by the object equals             the change in momentum of the object. In equation form, F             • t = m •             v.
```
10 years ago
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