# Shared Flashcard Set

## Details

MCAT Physics Unit 1
Physics Unit 1 (Chp 1-3) from Kaplan Review
50
Physics
02/17/2011

Term
 SI unit for length
Definition
 Meter (m)
Term
 SI unit for Mass
Definition
 Kilogram (kg)
Term
 SI unit for force
Definition
 Newton (N)
Term
 SI unit for Time
Definition
 second (s)
Term
 SI unit for Work and Energy
Definition
 Joule (J) which equals (N/m)
Term
 SI unit for Power
Definition
 Watt (W)
Term
 Give Prefix and abbreviation for powers of ten (9, 6, 3, -2, -3, -6, -9, -12)
Definition
 Giga (G or B), Mega (M), Kilo (K), Centi (c), Milli (m), Micro (u), Nano (n), Pico (p)
Term
 Give Sin value for the following angles: 0, 30, 45, 60, 90, 180
Definition
 0, 1/2, !2/2=0.7, !3/2=0.87, 1, 0
Term
 Give Cos value for the following angles: 0, 30, 45, 60, 90, 180
Definition
 1, !3/2=0.87, !2/2=0.7, 1/2, 0, -1
Term
 What is the difference between a scalar quantity and a vector quantity?
Definition
 A scalar quantity has magnitude but no direction. A vector quantity has magnitude and direction.
Term
 Vector or Scalar: distance, speed, displacement, mass, velocity, force, acceleration, energy Pressure, mass
Definition
 distance=s, speed-s, displacement=v, mass=v, velocity=v, force=v, acceleration=v, energy=s, Pressure=s, mass=s
Term
 (T/F) The sum of two vectors is the resultant of the vectors
Definition
 True
Term
 A person walks 2 miles north then turns around and walks 3 miles south. Total time elapsed-1 hour. Find the distance, displacement, avg. velocity, avg. speed
Definition
 distance=5 milesdisplacement=1 mile southavg. velocity=1mi/hr (S)avg. speed=5 mi/hr
Term
 Average acceleration (a)=
Definition
 change in velocity / change in time
Term
 For a body under constant acceleration, v=
Definition
 v=initial velocity + (a)(t)
Term
 Is weight a vector or scalar quantity? What is the formula for calculating weight?
Definition
 Vector; W=mg
Term
 What is Newton's First Law?
Definition
 1. Law of inertia; body in motion or at rest stay in motion or at rest unless a net force acts upon it.
Term
 What is Newton's Second Law of Motion?
Definition
 F-ma
Term
 What is Newton's third law of motion?
Definition
 To every force there is an equal and opposite force; Fb = =Fa
Term
 What are the formulas for the initial horizontal and vertical velocities of a projectile launched with speed v at an angle of theta to the horizontal?
Definition
 Horizontal velocity= v(cos theta)Vertical velocity = V(sin theta)
Term
 What does the total horizontal distance, x, traveled by a projectile equal?
Definition
 x = (initial horizontal velocity)(time in the air)
Term
 What is the formula for gravitational force? F=?
Definition
 F = [(gravity)(mass of obj. 1)(mass of obj. 2)] / (distance between the two objects squared)
Term
 If the distance between two objects is doubled, by how much is the force of gravity increased or decreased?
Definition
 It would decrease by a factor of 4 (2 squared)
Term
 (T/F) A body in translational equilibrium has a net force moving it at a constant velocity.
Definition
 False, a body in translational equilibrium has no net force acting on it.
Term
 If a lever arm is halved, by how much does the torque increase or decrease?
Definition
 Torque would decrease by half.
Term
 Formula for calculating torque =
Definition
 torque = [(r, distance between force and axis of rotation)(F, force)(sin theta)]
Term
 When calculating torque, which rotation direction is considered positive and which negative?
Definition
 Counterclockwise=positiveClockwise = negative
Term
 (T/F) For rotational equilibrium to occur, the sum of all torques acting on a body must be zero.
Definition
 True
Term
 Define Translational motion.
Definition
 motion in which the position of the object's center of mass changes as a function of time
Term
 Formula for the force of static friction =
Definition
 static friction = (coefficient of static friction)(Normal force, N)
Term
 Formula for the force of kinetic friction =
Definition
 kinetic friction =(Coefficient of kinetic friction)(Normal force, N)
Term
 What is the formula for centripetal acceleration for a body in uniform circular motion?
Definition
 a = (Velocity squared) / (radius, r)
Term
 What is the formula for centripetal force for a body in uniform motion?
Definition
 F = ma = [(mass)(velocity squared)] / (radius)
Term
 (T/F) For a planet orbiting a star, the centripetal force is equal to the gravitational force.
Definition
 True
Term
 What is the formula for Work?
Definition
 W = (Force)(distance)(cos theta)
Term
 What is the unit of work?
Definition
 Joule (J) which is equal to a N/m
Term
 What is the formula for power?
Definition
 P = Work / time
Term
 What is the unit of power?
Definition
 Watt (W) which is equal to (1 Joule/sec)
Term
 What is the formula for kinetic energy?
Definition
 KE = (mv squared)/2 ***mv is mass times velocity
Term
 What are the units of Kinetic energy?
Definition
 joules
Term
 What is the formula for gravitational potential energy? U = ?
Definition
 U = (mass)(gravity)(Height)
Term
 What are the units of gravitational potential energy?
Definition
 joules
Term
 (T/F) The total mechanical energy of a body is the sum of its kinetic and potential energies.
Definition
 True
Term
 Is total mechanical energy a constant if the only forces that act on a body are conservative (E=K+U=constant)?
Definition
 If only conservative forces act on a body then change in E = 0.
Term
 What is the formula for momentum? p=?
Definition
 p=(mass)(velocity)
Term
 What is the formula for impulse? J = ?
Definition
 J = (force)(time) = Ft=mv-(initial mv) =change in p
Term
 Is kinetic energy conserved in a completely elastic collision?
Definition
 Yes.
Term
 (T/F) Net external force must equal zero for conservation of momentum to occur
Definition
 True
Term
 What is the formula for the center of mass for two masses, m1 and m2, lying along the x-axis at points x1 and x2? X=?
Definition
 X = [(m1x1)+(m2x2)] / (m1 + m2)
Term
 (T/F) Momentum is not conserved in an inelastic collision.
Definition
 False, momentum is conserved in both elastic and inelastic collisions.
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