Physics Flashcards
Period of a pendulum (simple harmonic motion)
T=2π√(L/g)
Period of a mass on a spring (simple harmonic motion)
T=2π√(m/k)
When multiplying 2 vectors that are scalar, such as work, you must multiply by ______. Give an example equation
cos(θ)
example: W = Fdcos(θ)
If you are multiplying two vectors and the answer is a third vector (ex, torque), you must also multiply by______. Give an example.
sinθ
example: τ = Frsinθ
What are the 4 questions to test conceptual understanding?
Can I visualize it?
Can I draw a picture, graph or diagram of it?
Can I explain it to someone else in layman’s terms?
Can I think of and describe real-life examples?
What is a force?
Any influence capable of causing a mass to accelerate.
Is force a scalar or a vector?
vector
SI unit for force?
Newtons.
Break down what a newton is by using F=ma
kg•(m/s^2)
what is Inertia?
The ability of an object to resist a change in its velocity.
Formula for momentum?
p=mv
Acceleration is any change in _______?
Velocity
Acceleration describes how quickly the ________ is changing.
velocity
If there is no net force, can there be acceleration?
No
If force increases, what happens to acceleration?
It depends on the direction of the force. It could cause acceleration to increase or decrease.
If there is no acceleration, could there be a force?
Yes, they would just equal out and the net force would be zero.
Rule of thumb for direction of acceleration.
An object that is slowing down will have an acceleration directed in the direction opposite its motion.
For a projectile, what is the horizontal acceleration?
ZERO
For a projectile, does the horizontal velocity change?
NEVER (ignoring air resistance)
These things affect air resistance.
- Cross section area (greater area = more impact with air)
- Shape (How aerodynamic is it?)
- Velocity (greater velocity = more air resistance)
- Mass (greater mass = greater force needed to oppose it)
What assumptions should always be made about air resistance unless stated otherwise in the question?
That air resistance is NEGLIGIBLE, and DO NOT consider it unless EXPLICITLY told to do so.
Describe what happens at terminal velocity.
This is where the force of gravity equals the force of the air pushing up on the object. Acceleration is at zero.
F(air)=mg
Of a bowling ball and a balloon of the same size and shape, which will reach its terminal velocity faster? Which will have a larger terminal velocity?
The balloon will reach its terminal velocity faster.
The bowling ball will have a larger terminal velocity.
