# Shared Flashcard Set

## Details

Physics Exam
Review Questions
54
Physics
01/08/2008

Term
 Which component, horizontal or vertical, of an object's velocity remains constant as a projectile travels?
Definition
 horizontal
Term
 If the action force is the earth pulling on a feather, what is the reaction force?
Definition
 the feather pulling on the earth
Term
 If a cliff diver carried a speedometer on his dive, by how much would the reading increase each second?
Definition
 9.8 m/s2
Term
 If a car moves 29 meters in one second, 29 meters in the second second, and 29 meters in the third second of travel, what is its acceleration?
Definition
 0 m/s
Term
 When you look at the speedometer in a car the number reflects the ______________ velocity of the car.  (instantaneous or average)
Definition
 instantaneous
Term
 Why doesn't the horizontal component of velocity change during the flight of a projectile?
Definition
 because there are no forces acting in the horizontal direction
Term
 If a crumpled piece of paper and a flat sheet of paper fall which will hit the ground first?
Definition
 the crumpled piece because it is affected less by air resistance
Term
 If the upward direction is positive, during the flight of a projectile, the acceleration on the object is:positivenegativepositive then negativenegative then positive
Definition
 negative
Term
 If you increase the velocity of an object, which of the following quantities increases: momentum, kinetic energy, force
Definition
 momentum and kinetic energy
Term
 A ball hits a bat.  Compared to the force of the bat on the ball, the force of the ball on the bat is ____________.
Definition
 the same
Term
 Gravitational potential energy depends on what three things?
Definition
 mass of the object, the acceleration due to gravity and the object's height above the ground
Term
 Elastic potential energy depends on the spring constant (stiffness of the spring) and ______________.
Definition
 the amount of stretch
Term
 In the absence of air resistance, which will hit the ground first: an egg or feather?
Definition
 they will hit at the same time
Term
 The rate at which work is done
Definition
 power
Term
 The quantity of work done divided by the time it takes to do the work
Definition
 power
Term
 If at the same instant a bullet is dropped and another is shot perfectly straight forward at the same height, which will hit the ground first?
Definition
 they will hit at the same time
Term
 ________ causes acceleration.
Definition
 Force
Term
 If an object is moving in a circle is it accelerating?
Definition
 yes
Term
 Can an object accelerate without changing speed?
Definition
 yes, by changing direction
Term
 State Newton's Third Law
Definition
 For every action force, there is an equal and opposite reaction force
Term
 Which of Newton's Laws is behind the trick of pulling the table cloth out from under a place setting and having the place setting remain in the same position?
Definition
 Newton's First Law (objects at rest remain at rest unless acted on by a force)
Term
 A ball is falling, each second it falls it covers ____________ distance.morethe sameless
Definition
 more
Term
 If you double the distance you push an object but apply the same amount of force, how does the work change?
Definition
 it doubles
Term
 Newton's first law can be stated in one word: ___________.
Definition
 inertia
Term
 At the top of a projectile's path, its acceleration is ____________.
Definition
 9.8 m/s2 downward
Term
 If the acceleration of an object with constant mass doubles, what else has doubled?
Definition
 the force acting on the mass
Term
 Gravity acts in which direction?
Definition
 straight down
Term
 What type of friction could be referred to as moving friction?
Definition
 kinetic friction
Term
 Inertia is directly related to what property of an object?
Definition
 mass
Term
 What type of friction is non-moving friction?
Definition
 static friction
Term
 Traveling to another planet, which measurement changes mass or weight?
Definition
 weight
Term
 What unit is used to measure mass?
Definition
 kilograms
Term
 The product of force and distance
Definition
 work
Term
 State the law of conservation of energy
Definition
 Energy cannot be created or destroyed
Term
 What really happens when energy is "lost"?
Definition
 It is transformed into another kind or transferred to another object
Term
 If a runner increases his speed from 0 m/s to 3 m/s in the first second and 3 m/s to 6 m/s in the second second, what is his acceleration?
Definition
 3 m/s/s
Term
 What quantities use joule as the unit?
Definition
 kinetic energy, potential energy, work
Term
 If you are on rollerskates moving in a positive direction and begin to slow down, your acceleration is in which direction?
Definition
 negative
Term
 A quantity with magnitude and direction
Definition
 vector
Term
 What direction does friction act in?
Definition
 the direction opposite motion
Term
 How is the force of friction oriented relative to the surface of contact?
Definition
 parallel
Term
 The normal force is ____________ to the surface of contact
Definition
 perpendicular
Term
 What causes friction?
Definition
 bumps on the two surfaces in contact
Term
 Describe the energy change in a roller coaster as it moves up a hill.
Definition
 the energy changes from kinetic to potential
Term
 Where does a projectile have minimum speed?
Definition
 at the top of its path (vertical velocity is zero)
Term
 In the absence of friction, if a roller coaster is going 30 m/s before it crests a hill, how fast should it be going when it reaches the same position (height) on the way down the hill?
Definition
 30 m/s
Term
 A book is on a table, the force pushing back on the book is the _____________ force.
Definition
 normal
Term
 The product of 1/2 the mass of an object times the velocity squared
Definition
 kinetic energy
Term
 Force and acceleration are _______________ related. (directly, inversely)
Definition
 directly
Term
 Watts are the unit for _________.
Definition
 power
Term
 Mass and acceleration are ___________ related. (directly, inversely)
Definition
 inversely
Term
 If you do 10 J of work to lift an object, how much potential energy does it have?
Definition
 10 J
Term
 What is the value of g?
Definition
 9.8 m/s/s
Term
 If you are walking forward and toss a ball in the air, where will it land?behind youin front of youin your hand
Definition