Forces In Action Flashcards
Give Newton’s second law
The rate of change of momentum of an object is directly proportional to the resultant fore acting upon it
the change in momentum is in the same direction as the force.
Acceleration is proportional to..
Force
What happens when you have more force acting on an object in terms of acceleration
There is more acceleration the more force that acts on an object
What happens when an object has more massin terms of acceleration
The more mass an object has the less acceleration
Vertical component
Fy=Fsin(feta)
Horizontal component=
Fx=Fcos(feta)
The greater an objects mass what’s its relationship with velocity
The greater its resistance to its change in velocity
What is the centre of mass
The point at which the weight of an object acts through
Frictional forces
- Always act in an opposite direction to the motion of an object
- Can never speed things up or start things moving
- Convert kinetic energy to heat
Density
Mass/Volume
Pressure
Force/Area
Pressure (in a fluid)
hpg
Depth of objects in fluid(h) x density(p) x acceleration (g)
Define moment
Force x perpendicular distance from pivot
Force definition
When 1kg mass has an acceleration of 1ms^-2
Define torque of a couple
One of the forces x perpendicular distance between forces
What is Newton’s first law
An object will remain at rest or move at a constant velocity unless acted upon by a net force.
Newtons 3rd law
When body A exerts a force on body B, body B exerts an equal and opposite force on body
A of the same type.
Defbe linear momentum
Mass x velocity
Principle of linear momentum
Momentum before equals momentum after in a closed system
