PHY 121 Study Guide Questions with Verified
Correct Answers
Calculate average velocity when given the position
or velocity at different times.
Calculate average acceleration when given the position or velocity at different times.
a_avg= Δv/Δt
speed
distance versus time
Δx/Δt
Velocity is the slope of
the position vs. time
factor-label method
converting something for example in meters to miles. etc
Speed
(length divided by time)
Meters per second (m/s)
Volume
length cubed
Meters cubed (m3)
Weight
,mass times length divided by time squared
kilogram meters per second squared (kg-m/s2)
•Newtons (N)
kilo (k)
10^3
mega (M)
10^6
giga (G)
10^9
tera (T)
10^12
Acceleration
The rate at which velocity is changing.
-> Is proportional to force.
If I go from 0 mph to 60 mph in 2 s, what was my average acceleration?
1. find the velocity:
(60 miles/ 1hr) × (1609 m/ 1 mile) × (1 hr/ 3600s) = 26.8 m/s
2. use velocity to find acceleration:
a_avg=Δv/ Δt= vf−vi/ tf−ti = (26.8m/s)−(0m/s)/ 2s = 13.4m/s2
If we slide a block down a frictionless ramp, it will
, go a little farther every second than it did the second before...
Its velocity is increasing linearly
It has a constant acceleration.
steeper ramp= higher acceleration
object acceleration in free fall
a= g = 9.8 m/s^2
Newtons Laws 1. (Inertia)
An object in motion remains in motion and an object at rest remains at rest unless acted on by
an outside force
this applies both to a resting object AND a moving object.
You don't need a force to keep something moving
Newton's Laws- 2nd Law: Law of Acceleration
Force is proportional to mass and acceleration
a= Fm
F= ma
Newton's Laws
3rd law: Reciprocal Actions
For every action, there is an equal and opposite reaction.
Related to conservation of momentum
importances of newtons laws
If we know the mass of an object and all the forces on it, we can determine its acceleration...
From its acceleration we can determine its future velocity and future position.
Correct Answers
Calculate average velocity when given the position
or velocity at different times.
Calculate average acceleration when given the position or velocity at different times.
a_avg= Δv/Δt
speed
distance versus time
Δx/Δt
Velocity is the slope of
the position vs. time
factor-label method
converting something for example in meters to miles. etc
Speed
(length divided by time)
Meters per second (m/s)
Volume
length cubed
Meters cubed (m3)
Weight
,mass times length divided by time squared
kilogram meters per second squared (kg-m/s2)
•Newtons (N)
kilo (k)
10^3
mega (M)
10^6
giga (G)
10^9
tera (T)
10^12
Acceleration
The rate at which velocity is changing.
-> Is proportional to force.
If I go from 0 mph to 60 mph in 2 s, what was my average acceleration?
1. find the velocity:
(60 miles/ 1hr) × (1609 m/ 1 mile) × (1 hr/ 3600s) = 26.8 m/s
2. use velocity to find acceleration:
a_avg=Δv/ Δt= vf−vi/ tf−ti = (26.8m/s)−(0m/s)/ 2s = 13.4m/s2
If we slide a block down a frictionless ramp, it will
, go a little farther every second than it did the second before...
Its velocity is increasing linearly
It has a constant acceleration.
steeper ramp= higher acceleration
object acceleration in free fall
a= g = 9.8 m/s^2
Newtons Laws 1. (Inertia)
An object in motion remains in motion and an object at rest remains at rest unless acted on by
an outside force
this applies both to a resting object AND a moving object.
You don't need a force to keep something moving
Newton's Laws- 2nd Law: Law of Acceleration
Force is proportional to mass and acceleration
a= Fm
F= ma
Newton's Laws
3rd law: Reciprocal Actions
For every action, there is an equal and opposite reaction.
Related to conservation of momentum
importances of newtons laws
If we know the mass of an object and all the forces on it, we can determine its acceleration...
From its acceleration we can determine its future velocity and future position.
