Questions Flashcards
What is the symbol for average speed?
Vav
What is the symbol for change in?
Δ
What is the symbol for change in distance?
Δd
What is the symbol for initial distance?
d1
What is the symbol for final distance?
d2
What is the symbol for change in time?
Δt
What is the symbol for initial time?
t1
What is the symbol for final time?
t2
What are the equations for calculating speed, time, and distance?
v = d/t
t = d/v
d = vt
How do you convert m/s into km/h and vice versa?
m/s to km/h - multiply by 3.6
km/h to m/s - divide by 3.6
What’s the equation for calculating speed on a PT graph?
v = Δd/Δt
or
v = d2-d1/t2-t1
How do you calculate acceleration given speed and time?
a = v/t
How do you calculate acceleration with the refined formula?
Aav = v2-v1/Δt
How do you calculate time given acceleration and speed?
t = v2-v1/a
How do you calculate final speed given initial speed, acceleration and Δtime?
v2 = at + v1
How do you calculate initial speed given final speed, acceleration and Δtime?
v1 = v2 - at
What is the relationship between slope and acceleration on a VT graph?
- The slope on a line on a speed-time graph provides the acceleration
- A positive slope represents positive acceleration (faster speed)
- A negative slope represents negative acceleration (slowing down)
How do you calculate average acceleration and distance travelled on a VT graph?
a = v/t
d (rectangular) = vt
d (triangular) = 1/2vt
What is Newton’s first law of motion? Give 2 examples
The Law of Inertia
- Every object continues in a state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by forces exerted upon it.
ex. When you shake the branches on a tree and the leaves fall off
A soccer ball will remain at rest until you kick it
What is Newton’s second law of motion? Give 2 examples
Force and Acceleration
- The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force
ex. The harder you kick a soccer ball, the faster and farther it will go
Pushing the pedals on your bicycle will cause it to go faster (accelerate)
What is Newton’s Third Law of Motion? Give 2 Examples
Action and Reaction - To every action, there is an equal and opposite reaction
ex. Action: book pushes table; Reaction: Table pushes book
Action: bird flying and pushes air up; Reaction: Air pushes bird up
