1. Physical Science Forces
Section 3.1
Standard-
SPS8. Students will determine relationships among force, mass, and motion.
a. Calculate velocity and acceleration.
b. Apply Newton’s three laws to everyday situations
Essential Questions: 1. How are force, mass, and motion related?
2. What is Newton’s Second Law?

2. Forces

3. Newton’s Second Law Force and motion are related
An object will have greater acceleration if a greater force is applied to it
The mass of an object and the force applied to it affect acceleration
Newton’s second law of motion- connects force, mass, and acceleration in the equation acceleration equals net force divided by mass
F = m x a or a = F/m

4. Newton’s Second Law
Friction- force that opposes motion between two surfaces that are touching each other
Microwelds- areas where surfaces stick together- the source of friction
Friction between two surfaces that are not moving past each other is called static friction
Sliding friction- force that opposes the motion of two surfaces sliding past each other
Friction between a rolling object and the surface it rolls on is called rolling friction

5. Newton’s Second Law
Air resistance- the force that opposes the force of gravity
The amount of air resistance depends on an object’s shape, size, and speed
Terminal velocity- forces on a falling object are balanced and the object falls with constant speed