Zusammenfassung der Ressource
Forces-Moving Around
- See-Saw!!
- Pivot movement
- To balance a pivot
- Weight=1N
- Distance from pivot=0.1m
- Moment=0.1Nm
- Equal moments
Anmerkungen:
- 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.
Anmerkungen:
- 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
- Equation
- Pressure=Force/Area