# MCAT Physics 1

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 Author: Maki6tu ID: 134466 Filename: MCAT Physics 1 Updated: 2012-08-02 15:34:36 Tags: Physics Folders: Description: Physics 1 Show Answers:

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1. Average velocity
Vavg = (V1 + V2) / 2
2. Determining height reached
Time to reach peak * average velocity
3. Determining horizontal distance
Total time in air * X component of Vinitial
4. Net force = 0 means...
No acceleration. Can however have velocity but a = 0
5. If volume changes, is work being done?
Yes
6. Tension is...
7. Vector attributes
Has both magnitude and direction.
8. Scalar attributes
Has only magnitude
9. Newton's first law
The velocity of a body remains constant unless the body is acted upon by an external force.
10. Newton's second law
F=ma
11. Newton's third law
For every action there is an equal and opposite reaction.
12. Inertia definition
The ability of an object to resist a change to its velocity.
13. Center of Mass formula
Cmass = (r1m1 + r2m2 + r3m3...)/mtotal

r - the displacement vector between a reference point and each vector.
14. Center of gravity
At the center of mass.
15. Center of buoyancy
The geometric center, irrespective of the center of mass.
16. "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
17. Distance or height traveled formula
Distance = rate * time
18. Range (horizontal distance traveled) formula
Range = Vx * time
19. 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.
20. Formula for displacement in projectile motion
X = 1/2at2
21. Formula for final velocity when only height is given
V = √(2gh)
22. Formula for "round trip" or total time in air
tair = 2V/g

V must be the vertical component of initial velocity
23. The effect of surface area on air resistance
Greater surface area = more air resistance
24. The effect of shape on air resistance
Less aerodynamic = more air resistance
25. The effect of contour on air resistance
Rough surface = more air resistance
26. The effect of velocity on air resistance
Greater velocity = more air resistance

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