Self defensea

## Why is a force that is applied for a short time?

Answer: The average force is increased. A force that is applied for a short time is able to deliver a high impact force for the same change in momentum. If the time is small the force will be greater Ft=mv.

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

Why is it advantageous to roll with the punch in boxing? Rolling with the punch increases contact time, which decreases the force. Which undergoes the greatest change in momentum (if all of the baseballs have the same speed just before being caught and just after being thrown)?

## Why would it be a poor idea to have the back of your hand up against the outfield?

Why would it be a poor idea to have the back of your hand up against the outfield wall when you catch a long fly ball? Because you need to have that momentum to descease over a little bit of time because if it doesn’t have room to move backward, that force isn’t going to reduce and it will hurt very badly.

## What causes the greatest change in momentum?

A force acting for a given amount of time will change an object’s momentum. If the force acts opposite the object’s motion, it slows the object down. If a force acts in the same direction as the object’s motion, then the force speeds the object up. Either way, a force will change the velocity of an object.

## What are the two types of force?

There are 2 types of forces, contact forces and act at a distance force. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.

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## What is the direction of the force you applied?

An applied force is an interaction of one object on another that causes the second object to accelerate or change velocity or direction. The force can be a push, pull, or drag. The resulting direction of an object depends on the relative direction of the force on the object.

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

How does Dr. 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.

## Why is it less damaging if you fall on a mat than if you fall on a solid floor?

Why is it less damaging if you fall on a mat than if you fall on a solid floor? The time to come to a stop will be longer on the mat. This means a longer time to stop and a smaller force. No, momentum is not conserved, for an impulse acts on the cannonball.

## What are two ways to increase impulse?

Impulse has to do with time, it is the amount of force sustained for a period of time. You can increase the impulse by increasing the force applied or by increasing the period of time the force is applied.

## Why is a punch more forceful with?

Why is a punch more forceful with a bare fist than with a boxing glive? Because with a bare hand you have more force than with a boxing glove. 3) because when you caught the ball there was a greater force and when you through it back there also was a greater force.

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## Why are car dashboards steering wheels and boxing gloves padded?

Why are car dashboards, steering wheels, and boxing gloves padded? increase amount of time it takes the person and therefore decreases force. How can a karate “chop” break a board?

## Why are padded dashboards safer than hard dashboards?

Padded dashboards are safer than unpadded dashboards because the padded dashboard will increase the time required to stop your head from moving forward during an accident. The increased stopping time results in a smaller force being applied to the person’s head. Force is inversely proportional to stopping time.

## What is a change in momentum called?

This change in momentum is called impulse, and it describes the quantity that we just saw: the force times the time interval it acts over. The greater the impulse, the greater the change in momentum.

## What is the difference between impulse and momentum?

The momentum of the object is given by the product of mass and velocity while the impulse is the change of momentum when a large force is applied on an object for a short interval of time.

## Does Momentum have direction?

Momentum is a derived quantity, calculated by multiplying the mass, m (a scalar quantity), times velocity, v (a vector quantity). This means that the momentum has a direction and that direction is always the same direction as the velocity of an object’s motion.