Pages in this set

Page 1

Preview of page 1
P5a ­ Satellites, Gravity and Circular Motion
A satellite is an object that orbits another object in space because of the force of
gravity




Uses of Artificial Satellites
Monitoring weather or climate.
Communications e.g. Phone and TV.
Space Research, Hubble Telescope.
Spying.
Navigation e.g. GPS.






Geostationary Orbit Satellites
1) In…

Page 2

Preview of page 2

Gravitational Force
A universal force between masses and varies with distance
The bigger the mass the bigger the gravity (force)
The further apart the objects the smaller the force




Orbital Period varies with height
The higher the satellite is above Earth the slower the orbital period is because there is…

Page 3

Preview of page 3

Page 4

Preview of page 4
P5b ­ Vectors and Equations of Motion
Speed is a measure of how fast an object is moving. Velocity is speed in a given
direction.

Scalar Quantities
Scalar Quantities only have magnitude (size).
Examples: distance, speed, energy, mass and time.

Vector Quantities
Vectors are quantities that have magnitude and a…

Page 5

Preview of page 5
P5c ­ Projectile Motion
A projectile is something that is thrown or fired the path it takes is the trajectory. On
Earth due to the gravitational field if the projectile is horizontal the object will always
follow a parabolic trajectory unless it has a jetpack!



Example: Calculating Projectile using the…

Page 6

Preview of page 6
U=0

V=

A= 10m/s

T= ?



If we ignore air resistance the projectile has...
Horizontally Vertically
No force Gravitational
No force downwards
acceleration Acceleration
Constant downwards
velocity Increasing
Velocity
downwards






Projectiles have a downward acceleration that only affects the vertical
velocity.
Projectiles have no acceleration in the horizontal direction.
The…

Page 7

Preview of page 7

On earth the acceleration is always 10m/s downwards. The initial velocity is
nearly always 0.




Page 8

Preview of page 8
P5d ­ Momentum
Every action has a equal and opposite reaction. The formula for momentum is:
Momentum = Mass x Velocity



Conservation of Momentum
The momentum before a collision is always equal to the momentum afterwards. It relies on
the fact that momentum is a vector and has direction as…

Page 9

Preview of page 9
Crumple Zones are designed to fold in a collision increasing the time taken to stop so
therefore reducing the force on the passenger.






Injuries in a sports accident and those caused by car accidents are caused by a
very rapid acceleration of parts of the body.




Force and Momentum
Force…

Page 10

Preview of page 10
P5e ­ Satellite Communication
Radio waves are reflected off of the ionosphere and microwaves are be transmitted
to orbiting satellites.



Why are radio waves better for broadcasting
Radio waves have a large wavelength so they are diffracted around hills and over the horizon,
so they a spread out over a…

Comments

Sanah Iqbal

Thank you so much. Hopefully these should help!

Similar Physics resources:

See all Physics resources »See all resources »