Space Flashcards
What is a scalar quantity?
A scalar is a quantity that has only size (magnitude)
What is a vector quantity?
A vector is a quantity that has a size (magnitude) and a direction.
What are the 5 Scalar Quantites? (size only)
Distance, Speed, Time, Mass, Energy
What are the 5 Vector Quantities? (size + direction)
displacement, velocity, acceleration, force, weight
What is distance?
How far something has travelled.
What is displacement?
The direct distance from start point to finish point in a stated direction.
What is Speed?
The distance travelled per unit of time.
What is velocity?
The displacement travelled per unit time
What must be stated for a Velocity?
A direction.
How do you find acceleration from a Velocity Time-Graph?
From the gradient of the line or a= v-u/t
How do you find displacement from a Velocity Time-Graph?
From the area under the line.
When finding the area under the line, what will areas below the X axis be?
Negative values.
Why do projectiles follow a curved path?
Because it has two parts to its motion: Constant Horizontal Velocity and Constant Vertical Acceleration.
What does the Horizontal Motion/Velocity do?
Remains constant (doesn’t increase with time)
What does the Vertical Motion/Velocity do?
Increases with time.
How do you calculate vertical velocity?
With the equation Vv = u + at
How do you calculate Horizontal Velocity?
With the equation d = Vh x t
What is the period of a Satellite?
The time it takes to complete one orbit, depends on altitude (height)
When the height of a Satellites orbit increases, its period …..
Increases.
What is a Geostationary Satellite?
A satellite that stays above the same point on Earth’s Surface.
What is a Geostationary Satellites period and altitude?
Period of 24 hours, orbit at an altitude of 36000 KM
What are the 5 benefits of satellites?
Communication, GPS, Weather forecasting, Scientific Discovery and Space exploration
What are the 4 Risks of space travel?
Fuel Load on take-off, Exposure to radiation from cosmic rays, Pressure differential, Re-entry to a planet - friction causing immense heat
What is Newton’s III Law?
“If A exerts a force on B, then B exerts an equal but opposite force on A.”
What is a Light Year?
The distance light travels in one year
What do you need to detect different parts of the EM Spectrum?
Different types of telescopes.
What are the two types of Spectra?
Continuous spectra & Line Spectra
