1.4 Flashcards
Calculate the vertical components of a vector
Vv = vsinx
Describe the vertical motion of a projectile
If an object is moving downwards it will accelerate at 9.8ms^-2 due to the force of gravity.
If an object is moving upwards it will decelerate at -9.8ms^-2 due to the force of gravity until it reaches its maximum height.
Calculate the horizontal components of a vector
Vh = vcosx
Describe the horizontal motion of a projectile
When ignoring all external forces, the horizontal velocity of a projectile will remain constant throughout its flight path. It will only change if acted upon by an unbalanced force.
Calculate the time of flight of the projectile
v = u + at
Describe projectile motion
describes the motion of an object that has been launched and can be determined by the horizontal and vertical motion of the object individually.
What is a satellite?
any body that orbits around a planet
Explain how satellites oribit the Earth
Satellites orbit the Earth when their speed is balanced by the gravitational pull of Earth. Their horizontal speed can therefore outrun the downward pull of gravity, allowing it to constantly “fall” towards the Earth, allowing it to orbit the Earth without re-entering the atmosphere.
In simple terms, what is gravity?
the force of attraction between objects that have mass
What is the relationship between the force of gravity and the mass of two objects?
As mass of the two objects increases, the force of gravity increases. Therefore, the relationship is directly proportional.
What is the relationship between the force of gravity and the distance between two objects?
As the distance betwee two objects increases, the force of gravity decreases, making the relationship inversely proportional.
Break down the equation F = G m1m2/r^2
F = force (N)
G = gravitational constant (6.67 x 10^-11)
m1/m2 = mass (kg)
r = distance between the centres of the masses (m)
What is the speed of light in a vacuum?
3 x 10^8 ms^-1
The speed of light is a universal constant. What does this mean for measures such as mass, length and time when an object travels towards the speed of light?
The speed of light in a vacuum is constant and the same for all observers, therefore if an object travels close to the speed of light, measures such as mass, length and time must change.
