In certain martial arts, people practice breaking a piece of wood with the side of their bare hands. Use your understanding of impulse to explain how this can be done without injury to the hand.*1 pointGiven the same change in momentum, when the time interval is smaller the impact force is bigger.Given the same change in momentum, when the time interval is bigger the impact force is smaller.Given the same change in momentum, when the time interval is bigger the impact force is bigger.Given the same change in momentum, when the time interval is smaller the impact force is smaller.

The principle of impulse in physics can be used to explain how martial artists can break a piece of wood with their bare hands without injury. Impulse is the change in momentum of an object when a force is applied over a period of time. It is calculated as the product of force and the time over which it is applied (Impulse = Force x Time).

When a martial artist strikes a piece of wood, they aim to do it quickly and with a lot of force. This reduces the time over which the force is applied. According to the impulse principle, given the same change in momentum, when the time interval is smaller, the impact force is bigger. This large force is enough to break the wood.

However, the martial artist's hand is not injured because the force is distributed over a large area of the hand (the side of the hand), reducing the pressure. Additionally, the martial artist's hand is in motion before and after the strike, which also helps to distribute the force over time and prevent injury.

So, the correct answer is: "Given the same change in momentum, when the time interval is smaller the impact force is bigger."