Motion & Forces Chapter 2.3.

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Presentation transcript:

Motion & Forces Chapter 2.3

Forces Push or pull Anything that can change the motion (speed) of an object

Balanced Forces Forces that do not change the speed of an object Two forces that oppose each other (opposite directions) and are the same magnitude (equal in size) cancel each other out Net force (combined forces) = 0 N

Unbalanced forces When two forces act on an object but are not equal in magnitude (size) and/or not in opposite directions Always results in a change in speed of an object

Calculating Net Forces Practice Question 1: Calculate the net force for the object shown:

Calculating Net Forces Practice Question 2: Calculate the net force for the object shown:

Calculating Net Forces Practice Question 3: Calculate the net force for the object shown:

Inertia The tendency of an object to resist a change in its motion NEWTON’S FIRST LAW OF MOTION An object at rest stays at rest or an object in motion stays in motion unless a force acts upon it The speed of an object will not change unless a new force acts on the object

Practical Question: Using Newton’s First Law of Motion, explain why we need to wear seat belts?