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MCAT Physics 1
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Average velocity
V
_{avg}
= (V
_{1}
+ V
_{2}
) / 2
Determining height reached
Time to reach peak * average velocity
Determining horizontal distance
Total time in air * X component of V
_{initial}
Net force = 0 means...
No acceleration. Can however have velocity but a = 0
If volume changes, is work being done?
Yes
Tension is...
Vector attributes
Has both magnitude and direction.
Scalar attributes
Has only magnitude
Newton's first law
The velocity of a body remains constant unless the body is acted upon by an external force.
Newton's second law
F=ma
Newton's third law
For every action there is an equal and opposite reaction.
Inertia definition
The ability of an object to resist a change to its velocity.
Center of Mass formula
C
_{mass}
= (r
_{1}
m
_{1}
+ r
_{2}
m
_{2}
+ r
_{3}
m
_{3}
...)/m
_{total }
r - the displacement vector between a reference point and each vector.
Center of gravity
At the center of mass.
Center of buoyancy
The geometric center, irrespective of the center of mass.
"Constant Velocity" or " Constant Speed" means
No acceleration
No NET force
All forces sum to zero
No change in direction
The object is in equilibrium
Distance or height traveled formula
Distance = rate * time
Range (horizontal distance traveled) formula
Range = V
_{x}
* time
When facing projectiles think:
Horizontal velocity
never
changes (ignoring wind resistance)
Horizontal acceleration always = 0
Vertical acceleration always = 10 m/s
^{2}
Vertical behavior is always symmetrical (upward = downward)
Time in the air depends on the vertical component of velocity only.
Range depends on both the vertical and horizontal components.
Time is always the same for both the x and y components of the motion.
Formula for displacement in projectile motion
X = 1/2at
^{2}
Formula for final velocity when only height is given
V = √(2gh)
Formula for "round trip" or total time in air
t
_{air}
= 2V/g
V must be the vertical component of initial velocity
The effect of surface area on air resistance
Greater surface area = more air resistance
The effect of shape on air resistance
Less aerodynamic = more air resistance
The effect of contour on air resistance
Rough surface = more air resistance
The effect of velocity on air resistance
Greater velocity = more air resistance
Author
Maki6tu
ID
134466
Card Set
MCAT Physics 1
Description
Physics 1
Updated
2012-08-02T19:34:36Z
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