Dyanamics and Space Flashcards
memorise (29 cards)
Speed
the distance travelled by an object per second
Average speed
average for the whole journey (total distance travelled divided by the time taken)
d=vt
distance (m) =speed (m/s) time (s)
scalar
quantity is completely described by stating its magnitude (size) only
vector
quantity completely descirbed by stating its magnitude and direction.
scalars:
- distance
- speed
- mass
- time
- energy
Vectors:
- displacement
- velocity
- force
- acceleration
total distance travelled regardless of the direction
distance
the length measured from the start point to the end point in a straight line
displacement
Acceleration
the change in speed (or velocity) every second
F = ma
unbalanced force (N) = mass (m) acceleration (ms)
energy (J)
cannot be destroyed, but it can be changed from one form into another
Work done
is a measure of the energy transformed
Ew = Fs
Work (J) = Force (F) displacement (m)
Weight
is a force caused by gravity acting on an object’s mass
Gravitational Field Strength
weight per unit mass
W = mg
Weight (N) = mass (kg) gravitational field strength (Nkg-1)
Satellite
an object that orbits another object
Period
time taken for the satellite to complete one orbit
Applications of Satellites:
- Sending a Television or radio signal
- Navigation
- Weather monitoring
Star
a hot ball of matter which is undergoing nuclear fusion emitting light
A spherical ball of rock and/ or gas which orbits a star
Planet
A lump of matter which orbits a planet
Moon
consists of star and all the objects orbiting
Solar System
