Forces and their effects booklet Flashcards
Define a scalar
A quantity with magnitude
Define a vector
A quantity with magnitude and direction
Name three scalars
Mass
Density
Speed
Name three vectors
Force
velocity
acceleration
Name the two types of forces
Contact and non - contact
Name a contact force
Friction
Name a non contact force
Weight
What is the equation for weight ?
weight = Mass x gravity
w = m x g
Define a resultant force
More than one force actss on the body
What is the equation for spring constant ?
Spring constant = Force / extension
K = F / E
What is Newtons first law ?
If all forces an object are balanced then the object will be stationary or move at a constant speed
What Is Newtons 2nd law ?
If a resultant force is present. An object will accelerate in the direction of that resultant force
Define acceleration
The measurement of how much an objects speed has changed
Equation for acceleration ?
Acceleration = Change in speed / time taken
A = triangle v / t
What is newtons 3rd law ?
That for every force there is a equal but opposite force.
Define momentum
A measure of how difficult it would be to stop something
What does momentum depend on ?
Mass and velocity
What is the equation for Momentum ?
Momentum = Mass x velocity
P = M x V
Equation for force ?
Change in momentum / Time
Triangle P / t
