Moments are the same as The Turning Effect!Turning Effect is the point where the weights on either end of the pivot become balanced.
moments(Nm)=Force(N) x Distance from Pivot (m)
example= 1Nx0.2m=0.2Nm
example= 2Nx0.1m=0.2Nm
Balanced
A BIG force and a small distance from pivot
Balances...
A small force that's a long distance from the pivot
Circular Forces
Cause
A force pulling object towards
the centre as they move, when
balanced with Gravity, so they
move circularly
Centrifugal/Centripetal Force
It is Pulled tight...
Tension in the string
Tension is an upward force in the string
that balances the downward force of the
weight of the object on the end
Faster
Height of 'bung' increases
The width of the circle made increases
The tension in the
string increases as
the speed does too
Swinging!!
length of pendulum
The shorter the pendulum the
faster it completes a period!
Why?
It is naturally closer to the
ground so it can travel
faster as has less forces
acting on it and has less
distance to travel a full
period.
Less Air Resistance
Fastest
When it is closest to the ground
The force of Gravity is at it's strongest-Less
forces acting on the object
Falling
2 Balls regardless of their weight
will hit the ground at the same
time
A greater surface area=Longer to fall
Why?
More Space for Air resistance to take effect.
More Air Particles hit the surface and stop it accelerating.
Bigger the Surface=Less acceleration to No acceleration
Closer to ground=Faster to fall
Why?
There is less air resistance so more acceleration
Moon has no
atmosphere so no matter
their weight or surface
area they will still hit the
surface of the moon at
the same time
Parachuter
Not open
parachute
straight away
as they would
float like a
feather (no
acceleration)
They make a large area so they don't fall too fast.
Once they reach Terminal Velocity they release their parachute.
Nota:
Terminal Velocity/Speed is the point when an object is falling and the gravitional pull and the air resistance are balanced and the object stays at the same speed not accelerating/decelerating
Once released they decrease their speed fast
They then reach Terminal Velocity/Speed again before they land
Equation
Weight(N)=Mass(kg)xGravity(10)
Pressure
Area of Contact
Small area of contact has a larger pressure than a large force
Snow shoes
They spread the
weight out of a
person so less
pressure is
exerted on the
snow so a
person doesn't
get stuck in deep
snow