Key definitions/ tips for WA2 Flashcards
(26 cards)
Formula for velocity
Displacement over time
Definition for acceleration
The rate of change in the VELOCITY
Acceleration formula
(Final velocity - initial velocity) over time
What is the gradient of a displacement-time graph
The velocity
What is the gradient of a Velocity-time graph
The acceleration
Area under the graph of a velocity-time graph
Displacement
Gradient of Distance time graph
The speed.
Uniform acceleration
Constant rate of change in velocity
mass
Amount of matter in an object(scalar)
Weight
the gravitational force acting on an object that has mass (vector)
g
defined as the gravitational force per unit of mass
Similarities of action reaction pair
- Same magnitude
- Both either contact or non contact
Differences of action reaction pair
- Opposite directions
- Act on different objects
Unbalanced forces meaning
when resultant forces not equal 0 we can say the forces are unbalanced
Newtons first law
An object at rest stays at rest or an object in motion stays in motion unless a resultant force acts on it
Second Law
When a resultant force acts on an object, the object will accelerate in the direction of the resultant force
Third law
Every action has the equal and opposite reaction
Free body diagram
Box
Vector diagram
Tip to tail
Factors affecting air resistance
- Cross sectional area of object
- Speed of the object
What is CG
an imaginary point where the entire weight of object seems to act
principle of moments
When a body is in equilibrium, the sum of clockwise moments = sum of anti-clockwise moments about the same pivot.
Stability
The measure of its ability to return to its original position
How to know when it will topple
when the exactly vertical line from the cg leads outside the base.
