1. CHAPTER 3: FORCES
3.1 NEWTON’S SECOND LAW

2. NEWTON’S 2ND LAW OF MOTION
acceleration of an object is in the same direction as the net force on the object
Formula is also written as
F= ma or m = F/a

3. units of measurement acceleration in m/s2 force in Newtons (kg x m/s2)
when calculating acceleration using force
kg x m/s2 kg
acceleration in m/s2
force in Newtons (kg x m/s2)
when calculating acceleration using force
kg x m/s2 kg
always be sure your units work out

4. FRICTION
force that opposes the sliding motion of two surfaces that are touching each other
depends on:
-kinds of surfaces
-force pressing
objects
together

5. Types of Friction 1. Static friction
frictional force that prevents 2 surfaces from sliding past each other

6. 2. sliding friction force that opposes the motion of 2
surfaces sliding past each other

7. 3. rolling friction frictional force between a rolling object and
the surface it rolls on
flickr.com

8. air resistance opposing force on objects moving through air
opposite direction of gravity
the greater the surface area,
the greater the air resistance

9. air resistance depends on speed of object size of object
shape of object

10. terminal velocity
created when a vertically falling object has no net force because the downward force of gravity equals the upward force of air resistance
results in constant, maximum speed reached