Module 5 Flashcards
A student conducts an experiment to find the acceleration due to gravity. They conclude that the acceleration is 9.74m/s^2. What is their %accuracy (g=9.81m/s^2)
0.71% (2dp)
What is the purpose of a low-Earth orbit?
Military and Earth observations.
What is the definition of escape velocity?
Escape velocity is the minimum velocity needed for a satellite to escape its orbit.
What are the forces acting on the car while turning a horizontal corner?
Weight Force
The Normal Force
Centripetal Force
What does ‘G’ represent in the formula
G = universal gravitational constant
What is the unit for torque?
Newton Metre (Nm)
What unit is distance measured in in Newtown’s Law of Universal Gravitation
(m) metres
Fill in the blank: The magnitude of the attractive force between two objects is proportional to the product of their masses, and _________ __________ to the square of the distance between them.
inversely proportional
What angle should the force be from the lever arm to provide maximum torque
90 deg or perpendicular
What is the formula for the strengh of a Gravitational Field
F = GMm/r^2
What is the formula for total potential energy of a planet/satellite in orbit?
U = -𝑮𝑴𝒎/𝒓
What unit is gravitational potential energy measured in?
Joules
What energies give the total energy for a satellite in orbit?
Gravitational potential energy (U) and Kinetic energy (K)
Why is the total energy of a satellite in orbit negative?
The gravitational potential energy of the total energy is negative (U=-GMm/r)
Kepler’s 1st Law of Motion
Planets move in elliptical orbits with the Sun as a focus
Kepler’s 2nd Law of Motion
A planet covers the same area of space in the same amount of time no matter where it is in its orbit
Kepler’s 3rd Law of Motion
A planet’s orbital period is proportional to the size of its orbit (its semi-major axis)
Which component stays constant during the trajectory of projectile motion
Horizontal
What is the expression for the vertical component of velocity?
ux = sinθ
this aint right
What is the formula for the instantaneous velocity of an object in circular motion?
v = 2πr/T
What shape of motion does a projectile follow
Parabolic
If two balls are rolled off a table at the same time with different horizontal velocities, will the balls hit the ground at the same time?
Yes the balls will hit the ground at the same time, two objects falling under the influence of gravity from the same height will reach the ground simultaneously, regardless of their horizontal velocities
The centripetal acceleration formula
ac = v2/r
What equals 0 at the top of a projectiles arc?
Vertical component of acceleration (uy)
Not right, should be vertical velocity
What is the formula for the rate of change for the angular position of a rotating body?
w=2πf
At the max height of a projectile, what is it’s vertical velocity
What does the mass x velocity2 / radius equal?
Centripetal force
How does kinetic energy change as orbital radius increases?
Decreases
What direction is the normal force relative to a car on a banked corner?
perpendicular to the banked surface
What are the forces acting on an object on a banked turn?
Weight Force
The Normal Force
Centripetal Force
What are the forces acting on a mass attached to a string experiencing uniform circular motion?
Tension
Weight Force
How does gravitational potential energy change as orbital radius increases?
Increases
