VCE Together Year 12 Physics: Newton's Laws of Motion and 2D Applications

#### Physics

• How do things move without contact?
• How are fields used to move electrical energy?
• How fast can things go?
• How can waves explain the behaviour of light?
• How are light and matter similar?
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# Newton’s Laws of Motion and 2D Applications

In this lesson on Newton’s Laws of Motion and 2D Applications, which is part of Unit 3 Area of Study 3 for VCE Physics, you will learn how to:

• investigate and apply theoretically and practically Newton’s three laws of motion in situations where two or more coplanar forces act along a straight line and in two dimensions.

### What are Newton’s Laws of Motion?

Newton’s Laws of Motion are:

1. Inertia: An object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
2. F = ma : The velocity of an object changes when it is subjected to an external force. For an object with a constant mass m , the second law states that the force F is the product of an object’s mass and its acceleration a .
3. For every action (force) in nature, there is an equal and opposite reaction.

The following videos go further in-depth about what Newton’s Laws of Motion are, and why they are significant in describing static and dynamic interactions.

### How do we solve problems involving resultant and component forces?

To solve problems involving resultant and component forces, we apply the following relationships:

• \vec{F}_{AB} = -\vec{F}_{BA}
• F_{x} = Fcos(\theta), F_{y} = Fsin(\theta)

The following video covers a step-by-step approach in solving problems that involve resultant and component forces. It will go more in-depth on inclined plane forces components.

#### Inclined Plane

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