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# Tag Archives: product

## Physics of Diving

When a high diver in a swimming event springs from the board and “tucks in”, a rapid spin **result**. Why is this?

Answer: This is the consequence of **conservation** of **angular** momentum.

The **angular** momentum of a **body** is the **product** of Moment of inertia (*A measure of rotational inertia and it depends on the mass as well as distribution of mass about the axis of rotation. Farther the masses, greater will be the rotational inertia*) and the

**angular**

**velocity**(The speed of

**rotation**)

The **angular** momentum of a **body** remains unchanged in the **absence** of any external torque.

When the diver dives, he is giving his **body** a turning and takes off with his limbs stretched. In the stretched **position**, the **moment of inertia** is more. When he “tucks in”, the **moment of inertia** decreases. But since this happens without any external torque, it would **result** in an increase in **angular** **velocity** so as to keep the **angular** momentum constant.

## Difference between Scalar Product and Vector Product

“What is the difference between dot product and cross product?” [The question was posted by Salman)

## What is meant by momentum?

Momentum is the quantity of motion .Any thing in the universe is characterized by the quantity associated with it. In motion both mass and velocity contribute to its quantity. Momentum is the product of mass and velocity.

## Difference between dot product and cross product

Shashi Kant asked:

“What is difference between cross product and dot product?”

Answer:

If the product of two vectors is a scalar quantity it is called scalar product or dot product.

If the product of two vectors is a vector quantity it is called vector product or cross product.