## Why Is A Force That Is Applied For A Short Time More Effective In Karate??

Why is a force that is applied for a short time more effective in karate? **The average force is increased**. … Rolling with the punch increases contact time which decreases the force.

## Why is it advantageous in karate to apply a force for a short time?

In karate why is a short time for the applied force advantageous? **The shorter time is accompanied by a greater force when the momentum of the arm is reduced**. … Stopping and then reversing direction is a greater change in momentum and therefore requires a greater impulse.

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

4. The long cannon imparts **a greater impulse because the force acts over a longer time**. (A greater impulse produces a greater change in momentum so a long cannon imparts more speed to a cannonball than a short can- non does.)

## When the force of impact on an object is extended in time?

A | B |
---|---|

When the force of impact on an object is extended in time does the impulse increase or decrease? | Increases |

Distinguish between impulses and momentum.Which is force x time and which is inertia in motion? | Impulse=force x time momentum is inertia in motion. |

## When jumping from a significant height Why is it advantageous?

When jumping from a significant height it is advantageous **to land with knees bent** because it increases the time taken by person to come to stop decreases the impact and hurts less.

## Why is it advantageous for a boxer to ride with the punch?

Why is it an advantage for a boxer to ride with the punch? Why should he avoid moving into an oncoming punch? **It increases the time of impact and reduces the force of impact**. When the boxer moves toward the punch the time of impact is reduced and the force of impact is increased.

Knowing the amount of force and the length of time that force is applied to an object will tell you the resulting change in its momentum. They are related by the fact that force is the rate at which momentum changes with respect to time **(F = dp/dt)**.

## When Freddy Frog drops vertically from a tree?

Freddy frog drops vertically from a tree onto a horizontally moving skateboard. The skateboard slows. Give two reasons for the slowing one in terms of a horizontal friction force between Freddy’s feet and the skateboard and one in terms of momentum conservation.

## What is the meaning of impulsive force?

An impulsive force is **a force which acts on an object for a short period of time**. In a collision that results in a change in the velocity or momentum of one or more the objects involved in the collision an impulsive force is primarily produced.

## Why are cannons so long?

Firing a long gun

This helps to ensure that any left over embers from the last firing are extinguished before the gunpowder is put in. … Long guns being **extremely heavy when fully loaded and ready to fire** had to be moved into position after being loaded.

## How does the momentum of a fired cannonball compare to the momentum of the recoiling cannon?

**Momentum is conserved in collisions** and explosions . Conservation of momentum explains why a gun or cannon recoils backwards when it is fired. … The total momentum of the cannon and the cannon ball after being fired is also zero with the cannon and cannon ball moving in opposite directions.

## Why do padded dashboards make automobiles safer?

Padded dashboards make automobiles safer because **they increase the time taken to decrease the momentum of an impacting body to zero** which decreases the impact. Thus the force acting on the padded dashboards is small.

## What is collision short?

**impact**in physics the sudden forceful coming together in direct contact of two bodies such as for example two billiard balls a golf club and a ball a hammer and a nail head two railroad cars when being coupled together or a falling object and a floor.

## Why is it important to follow through when hitting a homerun?

Following through **maximizes the length of time the bat is in contact with the ball**. This maximizes the impulse allowing the greatest change in momentum and the greatest change in velocity.

## Would you be safe in firing a gun that has a bullet 10 times as massive as the gun explain?

Would you be safe in firing a gun that has a bullet 10 times as massive as the gun? … **The gun would recoil with a speed ten times the muzzle velocity**. Firing such a gun in the conventional way would not be a good idea.

## Why is it necessary to bend knees while jumping from great height?

When jumping from a great height our feet at once come to rest. For the small time when our legs comes to rest a large value of force is exerted on our feet. When the knees are bent slowly **the value of time of impact increases and less force acts on feet**. Therefore the probability of getting injured is less.

## Why do we need to bend our knees when landing from jumping a certain height explain in terms of momentum and impulse?

Answer: This is a consequence of the impulse momentum principle. When we bent our knees on landing **the time of impact increases and reduces the average force exerted during the entire process**. This prevents the chance of damage to our body.

## Does height affect high jump?

It is commonly thought that **the higher one is the easier it is to jump** but not always tall jumpers can obtain differentials achieved by shorter jumpers who are able to take advantage of other qualities. By differential we mean the difference between the jumped height and the athlete’s one.

## Why is the force of impact less when a boxer moves away from a punch?

When a boxer is moving away from a punch the force experienced is **reduced because the impact force is reduced by increasing the time of contact with**…

## How does riding a punch reduce the impact force between the fist and head?

How does “riding a punch” reduce the impact force between the fist and head? **It increases the impact time of the collision.**

## Why does a punch hurt less when you ride with the punch?

In both cases most of the transferred momentum will be absorbed and carried by the target’s muscles and he will feel the pain. It explains why the punch will be less **if the target moves towards the punch**.

## What is force times time?

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•Δv must be the change in momentum. The equation really says that the Impulse = Change in momentum.

## How can you relate a force with the change of momentum of a body short answer?

Force is a measure of the change of momentum over time. It can be written as **F = mass x change in velocity / time**. In practical terms the momentum of an object increases when a force is acting upon it because the force is causing it to accelerate and to have an increase in velocity.

## What is force divided by time?

In classical mechanics **impulse** (symbolized by J or Imp) is the integral of a force F over the time interval t for which it acts. … The SI unit of impulse is the newton second (N⋅s) and the dimensionally equivalent unit of momentum is the kilogram meter per second (kg⋅m/s).

## What is the force that accelerates a rocket into outer space?

The two forces acting on rockets at the moment of launch are the **thrust upwards** and the weight downwards. Weight is the force due to gravity and is calculated (at the Earth’s surface) by multiplying the mass (kilograms) by 9.8.

## When a vertically falling Firecracker bursts the vector sum of momentum fragments when a vertically falling Firecracker bursts the vector sum of momentum fragments?

When a vertically falling firecracker bursts the vector sum of momentum fragments. Both in the vertical direction equals the **momentum** of the firecracker before bursting and in the horizontal direction cancels to zero. continue allong the path as if the explosion didnt occur.

## When you throw a snowball from a moving snowboard Do you experience an impulse?

Yes because when you catch the ball it exerts a force on you. This **force has an impulse**. impulse of throwing it. Why is more impulse delivered during a collision when bouncing occurs than during one when it doesn’t?

## What is difference between impulse and impulsive force?

Hint: Impulse of a force is the time integral of a force. Impulsive forces on the other hand are great forces acting on a body for a short period of time. It is defined as the **rate of change of momentum of** a body during the time of the application of the force.

## Why do we use impulse in physics?

Impulse is **the change of momentum of an object when the object is acted upon by a force for an interval of time**. So with impulse you can calculate the change in momentum or you can use impulse to calculate the average impact force of a collision. A longer collision or impact time translates to a smaller force.

## What is impulsive force and impulse?

The **product of the force & the time for which it acts on a body** is called impulse of a force. The force acting on a body for short interval of time is called impulsive force.

## Can a cannon destroy a tank?

Anti-tank guns are guns designed to destroy **armored vehicles** from defensive positions. … Any field artillery cannon with barrel length 15 to 25 times longer than its caliber was able also to fire anti-tank ammunition such as the Soviet A-19.

## What is a six pounder gun?

6-pounder gun or 6-pdr usually denotes a **57-millimetre (2.2 in) gun firing a projectile weighing approximately 6 pounds (2.7 kg)**.

## Do cannonballs explode?

**cannonballs did not explode on contact**. Percussion fuses were not used on spherical projectiles. These shells and spherical case shot were designed to explode only when a flame reached the interior charge.

## Force its characteristics and effects

## Force can affect the speed and direction of an object.

## A Secret Symbol In Karate (明)

## Chapter 3 – Effective force