Space Flashcards
(27 cards)
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.”
