# What is momentum? ?

Please explain it so I could understand.... i need to write a script about momentum but im not understanding what momentum is.

### 8 Answers

- goringLv 68 months ago
There are two types of Momentum;Linear momentum and rotational Momentum.

Linear momentum is linear motion Energy per unit velocity.

Rotational momentum is Spin Energy per unit rotational velocity

Without mass in motion momentum does not exist. Thus motion requires a mass.

Anything mass less cannot move or have momentum.

In collision there is a both an Energy division and a Power division between the two colliding masses. If the collision is not perfect elastic ,momentum is not conserved.

The only collision that is perfect elastic is the collision between two photons,thus here momentum is conserved

Momentum does not exist without a cause of motion.

Basically Power is needed to cause motion.

- 8 months ago
Momentum allows a moving mass to exert a force over a period of time. It is conserved in a collision because the two masses exert equal and opposite fores for the same length of time.

- VamanLv 78 months ago
Momentum is the product of velocity and mass. I can stop a marble moving with a given velocity but I can not stop car with the same velocity as it momentum is very large. I can catch a water drop falling from a terrace but not a water pot. I can catch a tennis ball but not a bullet when they have the same momentum.

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- Old Science GuyLv 78 months ago
In general momentum is an expression of an object's effect in a collision.

The greater the mass of the object the greater the effect.

The greater the velocity of the object the greater the effect.

(and, of course, vice versa for both m and v)

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- ChristianLv 58 months ago
Mass x Velocity

When two objects collide, use addition and subtraction of vectors to determine the result of the collision.

- billrussell42Lv 78 months ago
if an object is moving, momentum is the product of its mass x its velocity. SI unit is kg•m/s, kilogram meters per second. US units are (I think) pounds-mass feet/second

Since velocity is a vector, so is momentum. Both have magnitude and direction.

Momentum is always conserved. In a collision, the total momentum of the objects is the same before and after the collision. Note that momentums are added using vector arithmetic.