# Unit 2 - Forces

## 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

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

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

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: