Physics

a projectile is fired horizontally in a region of no air resistance. the projectile maintains its horizontal component of velocity because...

it is not acted on by any horizontal forces

compared to falling on a wooden floor, a wine glass may not break when it falls on carpet because

it takes a longer time to stop

a rock is thrown vertically into the air. at the top of its trajectory the net force on it is...

its weight

compared to a recoiling rifle, the bullet fired has a greater

kinetic energy

a pair of tennis balls fall from the air from a tall building. one ball is regular and one ball is filled with lead pellets. the first ball to reach the ground is the...

lead filled ball

an object that has potential energy may have this energy because of its

location

a force is a vector quantity because it has both...

magnitude and direction

a kg is a measure of an objects...

mass

an object maintains its state of motion because it has...

mass

if an object has KE, then it must also have

momentum

if the speed doubles, what else doubles?

momentum

objects A and B have the sam size and shape. A is twice as heavy as B. when they are dropped simultaneously from a tower, they reach the ground at the same time. but A has a greater...

momentum

what does an object have when moving but never has at rest

momentum

when a rifle is fired, it recoils so both the bullet and rifle are set in motion. the rifle and bullet ideally acquire equal but opposite amounts of

momentum

a ball is thrown vertically in the air. because of air resistance, its time comping down compared to its time going up is...

more

an object that has kinetic energy must be

moving

horses that move with the faster linear speed on a merry go round are located

near the outside

an industrial flywheel has a greater rotational inertia when most of its mass is

near the rim

an objects weight may be properly expressed in

newtons

the impulse momentum relationship is a direct result of which law

newtons 2nd law

the conservation of momentum is most closely related to which law...

newtons 3rd law

a job is done slowly, while an identical job is done quickly. both jobs require same amount of work but different amounts of..

power

roll a bowling ball off the edge of a table. as it falls its horizontal component of velocity..

remains constant

a rock is thrown upwards at 50 degrees with respect to the horizontal. as it rises, its horizontal component of the velocity...

remains unchanged

a rifle recoils from firing a bullet. the speed of the rifle's recoil is small because the...

rifle had much more mass than the bullet

as a person gets closer to the middle of a see saw the other person rises or falls

rises

a huge rotating cloud of particles in space gravitate together to form an increasingly dense ball. as it shrinks in size, the cloud

rotates faster

centrifugal forces are an apparent reality to observers in a reference frame that is

rotating

a torque acting on an object tends to produce

rotation

you're driving when a bug hits a windshield. which undergoes the greater change in momentum? the car or the bug

same

if you push an object with twice as much work and twice the time, your power input is..

same amount as half the work in half the time

a car that travels twice as fast as another when breaking to a stop will skid how many times as far?

4

two factors that greatly affect air resistance on falling objects are the...

size and speed of the object

what is an example of not a vector quantity?

speed

the rotational inertia of your leg is greater when your leg is in what position?

straight

it is correct to say that impulse is equal to

the change in momentum

your weight is...

the gravitational attraction between you and the earth

a bow is drawn so that it has 40J of potential energy. when fired, the arrow will ideally have a kinetic energy of..

40J

a car travels in a circle at a constant speed. the net force on the car is what

directed towards the center of the curve

impulse involves the time that a force acts, work involves the

distance that a force acts

whenever the net force on an object is zero, its acceleration...

is zero

how much work is being done when carrying an object at constant velocity

0

what is combined momentum of two balls rolling down a table

0m/s

when an object falls through the air, its velocity increases and its acceleration...

increases

an object has twice as much mass as another object. the first object also has twice as much...

inertia

if you hit your head against a wall, the concept of why your head hurts is...

inertia

when a falling object has reached terminal velocity, its acceleration is...

zero

on a balanced see saw, a boy three times as heavy as his partner sits where

1/3 the distance of the fulcrum

the gain in speed each second for a freely falling object is about...

10m/s

a hydraulic press, like a simple lever, properly arranged is capable of multiplying energy input. T/F

False

if an object of constant mass experiences a constant net force, it will have a constant...

acceleration

a feather and a coin dropped in a vacuum fall with equal

accelerations

for a system in mechanical equilibrium, the net force on the system

and the net torque are zero

a bullet fired from a rifle begins to fall when?

as soon as it leaves the barrel

when doing somersaults, youll more easily rotate when your body is

balled up

a coin and a ring roll down a hill. which one reaches the bottom first

coin

a rock is thrown upwards at 50 degrees with respect to the horizontal. as it rises, its vertical component of the velocity...

decreases

an elephant and a feather fall from a tree through the air to the ground below. the amount of air resistance force is greater on the..

elephant

the newton is a unit of

force

a large and a small person wish to parachute at equal terminal velocities. the larger person will have to...

get a larger parachute

a skydivers terminal velocity will be greater if she falls...

head first

when a car is braked to a stop, its kinetic energy is transformed into...

heat

2 object of the same size but unequal weights are dropped from a tall tower. taking air resistance into consideration, the object to hit the ground first will be the...

heavier object

an upright broom is easier to balance when the heavier end is

highest, farthest from your head

if a non-rotating object has no acceleration, then we can say for certain that its...

in mechanical equilibrium

a light woman heavy man jump from an airplane at the same time and open their same sized parachutes at the same time. which person will get to a state of zero acceleration first?

the light woman

a bullet is fired from a gun. the speed of the bullet will be about the same speed as the recoiling gun if...

the mass of the bullet equals the mass of the gun

a feather and coin will have equal accelerations when falling in a vaccuum because...

the ratio of each objects weight to its mass is the same

compared to the mass of an object on earth, the mass of the same object on the moon is...

the same

gun is made of very strong but light material. suppose that the bullet is more massive than the gun itself. for this weapon..

the target would be safer than the shooter

the difference between impulse and impact force involves the...

time the force acts

a hydraulic press, like a simple lever, properly arranged is capable of multiplying force input. T/F

true

an object as rest may have energy T/F

true

2 identical arrows, one with twice the KE of the other, are fired into a hay bale. the faster arrow will penetrate...

twice as far as the slower arrow

when an object is lifted 10 meters, it gains a certain amount of PE. if the same object is lifted 20 meters, its potential energy gain is..

twice as much

when an object is raised above the ground it gains a certain amount of potential energy. if the same object is raised twice as high, it gains...

twice as much potential energy

if you do work on an object in half the usual time, your power output is...

twice the usual power output

put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt. to effectively make the wrench handle twice as long, you;ll multiply the torque by

two

As an object freely falls downward its...

velocity increases

to turn a stubborn screw, it is best to use a screwdriver that has a

wide handle

if you push an object twice as far while applying the same force you do twice as much..

work

the force required to maintain an object at a constant velocity in free space is equal to...

zero