Dynamics Flashcards
The velocity of a motion-time graph is
The gradient of displacement-time graph
What is redshift
When the Doppler effect is observed with light from galaxies
What is friction
A force which always acts in the opposite direction To an objects motion
What is the Doppler effect
When a source of waves is coming towards an observer a high frequency of a wave than that actually emitted will be observed because the waves become ‘bunched up’ in front of the source leading to a smaller wavelength
Balanced forces have
The same size but act in opposite directions on one object
Newton’s second law
Fun=ma
What is acceleration
Acceleration is the rate of change of velocity
Newton’s first law
An object will remain at rest or move with a constant speed in a straight line (constant velocity) unless acted upon by an unbalanced force
Newton’s third law
For every action there is an equal or opposite reaction
Elastic collision
Kinetic energy is conserved
The hotter a start is
The shorter the peak wavelength of the emitted radiation
The more energy it emits per second per square meter
Evidence supporting the big bang/ expanding universe theory
Cosmic microwave background radiation
The abundance of hydrogen and helium
The darkness of the sky
The large number of galaxies showing redshift rather than blueshift
What dose air resistance do when is effected by speed
Increase
Inelastic collision
Kinetic energy is not conserved
The acceleration of a motion-time graph is
The gradient of velocity-time graph
