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Answer:

It is called force.

Explanation:

A push or pull exerted on an object. Measured in Newtons. Friction & gravity are forces. There are balanced and unbalanced forces.

When an object moving forward, gets knocked sideways, the force is called external force.

What is an external force?

An external force is the force which changes the direction of motion of an object.

From Newton's first law of motion, an object at rest or uniform motion in a straight line will continue in that form unless, it is acted upon by an external force.

Thus, when an object moving forward, gets knocked sideways, the force is called external force.

Learn more about external force here: https://brainly.com/question/25800003