SPACE Space Travel Flashcards
State Newton’s third law
To every e action there is an equal but opposite reAction
Why is a rocket pushed forward?
Because the propellant is pushed back
Give is law simply using A and B
A pushes B so B pushes A back
During flight n Space why is there no need for engines to be switched in?
There is no friction from air resistance in a vacuum, so there is no unbalanced force and the object moves forward at a continuous steady pace. (Newtons first law)
Why, during take off, does the space craft ‘ditch’ parts?
To reduce mass, consequently reducing the fuel necessary to propel the rocket out of the earths atmosphere.
What us acceleration due to gravity?
The idea that an object falling near the earth surface accelerates (if air resistance is negligible)
Acceleration due to gravity is the same for all objects, regardless of mass. Show this using equations.
The only force action in the object is weight so W=mg
This is the force acting on the object so
F=mg
f=ma
Mg=ma
G=a
How could you measure the acceleration due to gravity?
The same way as you would measure instantaneous speed
Gravitational field strength is numerically equal to
The acceleration due to gravity
What is weight?
The force in an object due to gravity. IT IS A FORCE
What is gravitational field strength?
The weight per unit mass
What is gravitational field strength measure in?
N/kg
What happens to the force of gravity as an object moves further away from the planet?
It decreases
What is true weightlessness?
When the pull of gravity is 0
What is weightlessness?
When two projectiles both accelerate towards earth with the same acceleration.
