Space

the force on an object due to its position in a gravitational field

the change in energy that occurs when a force is moving an object

the work done to move an object from infinity to a point within the gravitational field

the path a projectile takes as it is moving through the air

• verticle component is acceleration due to gravity
• Horizontal component is constant velocity

the initial velocity required by a projectile to rise vertically and just escape the gravitational field of a planet

the measure of acceleration on an object using acceleration due to gravity as a base unit

on the equator and to the east

• 200-1000km above earth
• fast velocity
• used for mapping

• 36000km
• period of 24 hours
• used for em communications

collision with air particles causing heat

• angle 5-7degrees
• nose angled upwards
• heat ionises surrounding air blocking communications

• helped pioneer first liquid fuel rockets
• proved space travel was possible by proving thrust in a vacuum
• solved many technical problems

• fills all space
• transparent
• permeates all matter
• extremely low density
• high elasticity

• all motion is relative
• cant detect v unless you have another frame of reference to compare it to

• The laws of physics are true in all inertial frames of reference
• c is constnat

events that are simultaneous in one frame of reference when approching c are not for another frame of reference

the mass of an object increases as its speed increases as mass and energy are interconvertible. at speeds approaching C mass increase is exponential

the length of an object is affected by its speed relative to others. if a spaceship at C zooms past observed from earth it would seem shorter and earth will seem smaller from the ship

time measured by observers that are in relative motion to eachother are different. man in a ship approachin C will see an earth clock moving slower and vice versa

the atomic clocks

• 1m = the distance light travells in a fraction of a second
• 1s = the time it takes for a specific number of oscillations of the caesium 133 atom

• at current speeds it would take millions of years
• infinate mass thus infinate acceleration
• amount of fuel alone is prohibitive