Physics

Measurement

A comparison process used to determine the quantity of something.

Standard

A reference used as a measure for length, mass, and time.

Unit

A quantity or amount used as a standard of measurement.

Physical Quantity

A quantity in physics that can be measured, represented with a number and a unit.

Basic Physical Quantities

The fundamental types of measurements, including length, mass, time, temperature, electric current, amount of substance, and luminous intensity.

Derived Physical Quantities

Quantities that are derived from basic physical quantities, such as area, volume, density, speed, and energy.

Scalar Quantity

A quantity having only magnitude with no direction; examples include time and energy.

Vector Quantity

A quantity having both magnitude and direction; examples include force and velocity.

Force

A push or pull that can change the shape or motion of an object.

Weight

The force of gravity acting on an object's mass, measured in newtons (N).

Moment

The turning effect of a force applied at a distance from a pivot point.

Pressure

The force acting normally per unit area, measured in pascals (Pa).

Atmospheric Pressure

The pressure exerted by the weight of the air in the atmosphere, highest at sea level.

Water Pressure

The pressure exerted by water, which increases with depth due to the weight of the water above.

Standard Form

A way of expressing numbers as a product of a number between 1 and 10 and a power of 10.

Normal Force

The force exerted perpendicular to a surface that supports the weight of an object.

Friction

The force that opposes the motion of objects in contact.

Balanced Forces

Forces that are equal in size and opposite in direction, resulting in no net force.

Unbalanced Forces

Forces that are not equal, resulting in a net force that causes acceleration.

Fill in the blank: The force that opposes the _________ of objects in contact is known as friction.

motion