Friction
Friction 2.0
Forces
Free Body Diagrams
F=ma
100
The sum of all forces acting on an object
Net Force
100
When an object is in motion at a steady speed in a straight path
Dynamic Equilibrium
100
The force that holds an object in place on a surface; also called a support force
Normal force
100
What is happening to this object?
Accelerating to the right
100
Find the acceleration:
Fnet = 12N, m= 4 kg
F=ma, so a=F/m
12/4= 3 m/s2
200
When the sum of all forces acting on an object is equal to zero
Balanced Forces
200
If an object is on a ramp and isn't moving, it is because of ________ friction
Static
200
The force applied by one object to another object
Applied force
200
What two forces are acting on this tire swing? 
Tension and gravity
200
Find the Fnet
6 kg object, accelerating at 2.5 m/s2
Fnet= 15N
300
When the sum of all forces acting on an object is not equal to zero (the object experiences a change)
Unbalanced Forces
300
If an object is accelerating and has friction acting on it, that is ________________ friction
Sliding
300
The force that pulls all objects toward the center of the Earth
Gravitational force
300
If she is no longer accelerating, what do we say about the Fnet 
Fnet = 0 or terminal velocity
300
Find the mass
Fnet= 28N, a= 4 m/s2
7 kg (F=ma...28=4a)
400
A contact force between two objects that acts in the opposite direction of the applied force
Frictional Force
400
If friction and applied force are equal and an object is moving, it is in ________________ equilibrium
Dynamic
400
This found by multiplying mass x gravity
Weight OR Gravitational Force
400
Is it POSSIBLE that this object is in motion?
Yes, same Fapp as Ff
400
Find the mass
Fg = 2300 N
230 kg
500
When an object is at rest
Static Equilibrium
500
Why will a ball thrown in space continue until it hits something
No friction
500
This used as a visual representation of forces acting on an object
Free Body Diagram OR Force Diagram
500
THIS IS IN MOTION
What could be happening to it? 
Sliding without friction
Slowing down (friction ----> )
500
Find the tension force if it is not accelerating:
Hanging basket with a mass of 25 kg
250 N
Weight (Fg) 25x10= 250 N
Ft = 250 N