Class 8 Science: Advanced Force and Pressure

A person is able to crush a soda can by standing on it. If the same person lies down on the can, it does not crush. This difference is primarily due to:

Two objects, X and Y, have the same mass. Object X exerts a pressure of P_X and object Y exerts a pressure of P_Y on the ground. If the area of contact for X is half that of Y, which of the following is true?

Why are dams built with a much wider base than their top, even though the water level is uniform throughout the width?

Which of the following scenarios best demonstrates a non-contact force at play?

A hydraulic lift uses oil to multiply force. This principle is based on:

The SI unit of pressure is the __________, defined as one Newton of force distributed over one square meter area.

The upward force exerted by a fluid on a submerged object is known as _________ force.

Atmospheric pressure _________ as we move to higher altitudes.

Explain why it is easier to cut an apple with a sharp knife than with a blunt knife, even if the same amount of force is applied.

Describe two practical applications where reducing friction is beneficial and two where increasing friction is necessary.