# Why is it advantageous to roll with the punch in boxing?

## Why does a long cannon impart more speed?

The long cannon will impart a greater impulse because the force acts over a longer time. (A greater impulse produces a greater change in momentum, so a long cannon will impart more speed to a cannonball than a short cannon .

## How is the impulse momentum relationship related to Newtons second law?

The impulse – momentum theorem states that the change in momentum of an object equals the impulse applied to it. The impulse – momentum theorem is logically equivalent to Newton’s second law of motion (the force law ).

## Can you produce a net impulse on an automobile if you sit inside and push on the dashboard?

Can you produce a net impulse on an automobile if you sit inside and push on the dashboard ? Only external forces produce changes in momentum, so no you cannot as it is an internal force. Railroad car A rolls at a certain speed and makes a perfectly elastic collision with car B of the same mass.

## What does it mean to say momentum is conserved?

Conservation of momentum , general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.

## When a cannonball is fired from a cannon?

Momentum is conserved in collisions and explosions . Conservation of momentum explains why a gun or cannon recoils backwards when it is fired . When a cannon is fired , the cannon ball gains forward momentum and the cannon gains backward momentum. Before the cannon is fired (the ‘event’) the total momentum is zero.

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## Why does a long cannon impart more speed to a cannonball than a short cannon?

The long cannon will impart a greater impulse because the force acts over a longer time. (A greater impulse produces a greater change in momentum, so a long cannon will impart more speed to a cannonball than a short cannon .)

## What are two ways to increase impulse?

Impulse is the product of force and distance moved. 3. What are the two ways to increase impulse ? Increase the force or increase the time the force acts.

## How does Dr Hewitt break the piece of wood?

Hewitt break the piece of wood ? He causes a change in momentum of his hand over a short period of time. Increase the change in momentum, and decrease the time duration.

## What is impulse equal to?

The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse ; the impulse causes and is equal to the change in momentum.

## How much impulse stops a 50 kg carton that is sliding at 4 m/s when it meets a rough surface?

Physics the fourth

A B
What is the momentum of a 50 kg carton that slides at 4 m / s across an icy surface ? 50 kg x 4 m / s =200 kg x m/ s
The sliding carton skids to a stop on a rough surface in 3 s . Calculate the force of friction it encounters. F=deltamv/t=(200 kg x m/ s )/(3 s )=66.7

## How does the force on the rifle compare with the force on the bullet and why?

Part A: How does the force on the rifle compare with the force on the bullet, and why ? The magnitude of the force on the rifle is equal to the magnitude of force on the bullet and the forces are in the opposite direction, because for every action there is an equal and opposite reaction.

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## When two vehicles collide momentum is conserved?

An inelastic collisions occurs when two objects collide and do not bounce away from each other. Momentum is conserved , because the total momentum of both objects before and after the collision is the same. However, kinetic energy is not conserved .

## How do you know if momentum is conserved?

If the ‘m’ value and the ‘v’ value remain the same, the momentum value will be constant . The momentum of an object, or set of objects (system), remains the same if it is left alone. Within such a system, momentum is said to be conserved .

## Is angular momentum conserved?

In a closed system, angular momentum is conserved in all directions after a collision. Since momentum is conserved , part of the momentum in a collision may become angular momentum as an object starts to spin after a collision.

## Is momentum conserved when a ball bounces?

conservation of momentum : The amount of momentum in a system remains the same after a collision. elastic collision: A collision in which all of the momentum is conserved . For example, a ball that bounces back up to its original height. For example, a ball that only bounces partially to its original height.