Chapter 4-5 (moment, force and pressure)

Front

Where is the center of gravity of a uniform rod located?

Back

At its middle point.

Front

What does a graph of extension against force for an elastic material look like?

Back

A straight line from the origin.

Front

If a mass m is at the far end of a plank and mass M = 2m is on the plank, how far from the pivot should M be to balance the plank?

Back

L/4.

Front

What force causes an extension of 5 cm in an elastic material?

Back

1.0 N.

Front

Why does the thickness of a dam increase with its depth?

Back

Water pressure increases with depth.

Front

Define 'moment' in physics.

Back

The moment is the measure of the force causing an object to rotate about a pivot point, calculated as the product of the force and the distance from the pivot.

Front

What is 'force' in physics?

Back

Force is an interaction that causes an object to change its velocity, direction, or shape, measured in Newtons (N).

Front

Explain 'pressure' in a physical context.

Back

Pressure is the force applied per unit area on a surface, measured in Pascals (Pa).

Front

What is the formula for calculating pressure?

Back

Pressure (P) = Force (F) / Area (A).

Front

What happens to pressure as depth increases in a fluid?

Back

Pressure increases with depth due to the weight of the fluid above.