A kicker strikes a ball with a strong force.
a) Explain the evidence that shows the ball is not filled with liquid?
b) Describe what is happening to the particles inside the ball?
* chapter is about forces and pressure*
a) To determine whether the ball is filled with liquid or not, we can consider the evidence provided by its behavior when struck with a strong force. If the ball is filled with liquid, we would expect the liquid to move or slosh around inside due to the force applied. However, if the ball does not exhibit any signs of liquid movement or leakage upon impact, it suggests that the ball is likely not filled with liquid. This evidence indicates that the ball might be filled with another substance, such as air or a solid material.
b) When a kicker strikes the ball with a strong force, the particles inside the ball experience an increase in pressure. Pressure is defined as the applied force over a given area, so when the kicker's force is rapidly exerted on the ball, pressure builds up within it. This increase in pressure causes the particles inside the ball to compress and become more densely packed together.
In the case of a ball filled with air, upon impact, the air particles inside the ball get squeezed together, increasing the air pressure. Conversely, if the ball is filled with a solid material, like foam or rubber, the particles within the material will also compress and deform under the applied force.
The behavior of the particles inside the ball can be explained by the principles of forces and pressure, which are the main topics of the chapter you mentioned.