MCAT Physics 1
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Vavg = (V1 + V2) / 2
Determining height reached
Time to reach peak * average velocity
Determining horizontal distance
Total time in air * X component of Vinitial
Net force = 0 means...
No acceleration. Can however have velocity but a = 0
If volume changes, is work being done?
Has both magnitude and direction.
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 third law
For every action there is an equal and opposite reaction.
The ability of an object to resist a change to its velocity.
Center of Mass formula
Cmass = (r1m1 + r2m2 + r3m3...)/mtotal
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 = Vx * time
When facing projectiles think:
- Horizontal velocity never changes (ignoring wind resistance)
- Horizontal acceleration always = 0
- Vertical acceleration always = 10 m/s2
- 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 = 1/2at2
Formula for final velocity when only height is given
V = √(2gh)
Formula for "round trip" or total time in air
tair = 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
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