# Unit 2 - Forces

## Inertia

Inertia

**You should be able to:**

- Define inertial mass as resistance of an object to acceleration and solely depends on mass
- Objects require external forces to change their current state of motion

**Resources on Inertia:**

## Newton's Second Law: F = ma

Newton's Second Law: F = ma

**You should be able to:**

- Understand that force has a proportional relationship with mass and acceleration
- Understand that mass and acceleration have an inverse relationship
- Understand that the force acting on an object is in the direction of the acceleration
- Find the net force acting on an object, multiplying the net mass by the net acceleration
- Know that force can be seen in vector components (x and y)

**Video Resources for Newton's Second Law**

**Sample problems from Pearson Physics:**

Page 180, problems 46, 53-57, 61, 87, 105

## Newton's Third Law

Newton's Third Law

**You should be able to:**

- Show that for every force acting on an object, there is a force acting on a different object
- Show that action and reaction forces are equal in magnitude and opposite in direction

**Video Resources for Newton's Third Law:**

**Sample problems from Pearson Physics:**

Page 159, problems 7, 15, 18

Page 180, problems 56, 57, 60, 62, 63

## Hooke's Law: Force from a Spring

Hooke's Law: Force from a Spring

**You should be able to:**

- Apply the equation of force of a spring
- Show a conceptual understanding of spring constants

**Video Resources for Hooke's Law:**

## Friction

Friction