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Mass resists forces (inertia)

An object's mass describes its tendency to resist changes to its motion or state of rest. This tendency is called inertia.

This means that a force must be applied to change the motion of an object.

A spaceship travelling through space will not slow down unless it experiences a force.

Similarly, a force must be applied to get a stationary object moving.

A stationary ball remains at rest on the ground until it is kicked.

An object with a larger mass requires a larger force to change its motion.

A larger force is required to lift a bowling ball than a ping pong ball. The bowling ball has more mass than a ping pong ball.

Inertia itself is not a force.

Because of its huge mass, an oil tanker strongly resists changes to its velocity. If fully loaded and travelling at maximum speed, it requires over $3 \ukm$ to come to a stop.