Fun Physics Chapter 1-6
suppose you're coasting on level ground in a car at 60 km/h and apply the brakes until you slow to 40 km/h when you suddenly release the break the car tends to
continue moving at 40 km/h in the absence of forces
a rock is thrown up ward a 50 degrees with respect to the horizontal as it rises its vertical component of velocity
decreases.
the pressure in a liquid depends on liquid
density and depth
A ball tossed vertically upwards rises reaches its highest point and then falls back touts starting pint. during this time the acceleration of the ball is always
directed downward
an object is propelled along a straight line path by a force. if the net force were doubled the objects acceleration would
double
when gas in a container is squeezed to half its volume and the temperature remains the same the bass pressure
doubles
the earth pulls on the moon. Similarly the moon pulls on the earth evidence that the
earth and moon are simply pulling on each other and the earths and moons pulls comprise an action reaction pair.
Atmospheric molecules do not fly off into outer space because of
earth gravitation
the main difference between gases and plasmas has to do with
electrical conduction
the vole of matter comes mostly from its
electrons
during an eclipse of the sun the high ocean tides on the earth are
extra high
A satlite travels close to earth its speed is slower at this position. T or False
false.
which of the following is are vector quantities
force acceleration and velocity
a player hits a ball with a bat the action force is the impact of the bat against the ball. the reaction to this force it the
force of the ball against the bat
A light women and heavy man jumped from an airplane at the same time and open their same size parachutes at the same time. Which person will get to the state of zero acceleration first.
The light women.
A sheet of paper can be withdrawn from under a container of milk without toppling if the paper is jerked quickly this best demonstrates that
The milk carton has inertia
Early Greeks new to a fair approximation
The size of the moon the size of the earth the earth moon distance
a truly educated person is Knowledgeable about
science, the arts, and religion
a moving object has
speed, velocity, momentum, energy
when a load is placed on the middle of a horizontal beam supported at each end the bottom part of the beam undergoes
tension
the effects of scaling are beneficial to small creatures
that fall from great heights
A helium filled balloon released in the atmosphere will rise until
the balloon and surrounding air have equal densities
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
its just a sas hard to accelerate a care on the moon as it is to accelerate the same care on earth this is because
the mass of the car is independent of gravity
compared to the mass of a certain object on earth the mass of the object o the moon is
the same
a ball is thrown upwards and caught when it comes back down. neglecting air resistance its speed when caught is
the same as the sped it had when thrown upwards.
A Mack truck and a Volkswagen traveling at the same speed Clyde head-on. The impact force is:
the same for both
which pulls on the oceans of the earth with the greater force
the sun
planets would crash into the sun if it weren't for
their tangential velocities
a fan attached to an ice sail craft stalled on a windless day blows air into the sail that bounces backward upon impact the boat can
then mov in the direction of the wind impact force.
the synthesis of a large collection of information that contains well tested and verified hypotheses about certain aspects of the world is known as scientific
theory
Speed is not a vector quantity
true
n eath satellite is simply a projectile freely falling around the earth t or f
true
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
how many different elements are in a water molecule?
two
when a chocolate bar is cut in half its density is
unchanged
as and object freely falls downward, its
velocity increases
When a rock is thrown straight upwards gets the exact top of its path it's;
velocity is zero and it's acceleration is about 10 m/s per second.
As a high-altitude balloon sinks lower and lower into the atmosphere it undergoes a decrease in
volume
a balloon is buoyed up with a force equal to the
weight of air it displaces
atmospheric pressure is caused by the
wight of the atmoshpere
A piece of rope is pulled by two people in a tug of war each pulls with 400 N force what is the tension in the rope
400 N
tripling the linear size of an object multiplies its area by
9 and its volume by 27
the earth is closer to the sun in January than in july which accounts for the fact that the highest tides in the northern hemisphere occur in
winter
when a falling object has reached its termal velocity its acceleration is
zero
the vertical height attained by a basketball player who achieves a hang time of a full 1 second is about
1.2 meters
The gain in speed each second for a freefalling object is about
10 m/ second
what is the buoyant force acting on a 10-ton ship floating in the ocean
10 tons
about how high can water be theoretically lifted by a vacuum pump at sea level
10.3 meters
an apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about
10m/s
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of
141 km/h
a rock suspended by a weighing scale weighs 5 N out of water and 3 N when submerged in water. What is the buoyant force on the rock.
2 N
if a projectile is fired straight up at a speed of 10 m/s the total time to return to its starting position is about
2 seconds
an empty roller coaster car at an amusement park takes 3 minutes to make its ride from start to finish. neglecting friction a fully loaded car would take
3 minutes
which of the following is not a compound? air ammonia water salt
Air
In science facts,
B) May Change
A truck is moving at a constant velocity. Inside the storage compartment a rock is dropped from midpoint of the selling and strikes the floor below. The Rock the floor
Exactly below the midpoint of the ceiling
Of force is a vector quantity because it has both
Magnitude and direction
if the speed of a moving object doubles then what else doubles?
Momentum
two objects A and B have the same size and shape but 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
in which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the
Moon
what prevents satellites such as the space shuttle form falling?
Nothing they continually fall all around the earth
thrown an object at an angle upward. with no gravity it will follow a straight line path. But because of gravity at the end of 1 second it is
about 5 m below the straight line
when you stand at rest on a pair of bathroom scales the readings on the scales will always
add to equal your weight
a strong spring is stretched 10 cm by a suspended weight. If the wight is doubled the spring will stretch
another 10 cm making the total stretch 20 cm.
a phonograph record player has a constant rotational speed. the speed of the record relative to the pickup needle is greates
at the beginning of the record( outside edge).
A ball connected to a string has the most potential energy
at the top of its path
in drinking soda or water through a straw we make use of
atmospheric pressure
you re driving down the highway and a bug splatters into your windshield. which undergoes the greater change in momentum the bug or car.
both do
the earths gravitational field extends
both inside and outside the earth and throughout the entire universe.
Arnold Strongman and Suzie Small each pull ver hard on opposite ends of a massless rope in a tug of war the greater force of the rope is exerted by
both the same interestingly enouph
water pressure is greatest against the
bottom of a submerged object
toss a baseball bat into the air and it wobbles about its
center of mass
the scientific method is most effective in
gaining organizing and applying new knowledge
consider drops of water that leak from a dripping faucet as the drops fall they
get farther apart
According to Newton the greater the masses of intreating objects the
greater the gravitational force between them
when a car is braked to a stop, its kinetic energy is transformed to
heat
An upright broom is easier to balance when the heavier end is
heist farthest form your hand
in science an educated guess is a
hypothesis
If the mass of the earth somehow increased with no change in radius your weight would
increase
as a woman holding her breath swims deeper and deeper beneath the waters surface her density
increases
if an objects mass is decreasing while a constant force is applied to the object, the accelreration
increases
when a twirling ice skater brings her arms inward her rotational speed
increases
compared to a 1-kg block of solid iron a 2 kg block of solid iron has twice as much
interia, mass and volume
whenever the net force on an object is zero its acceleration
is zero
A woman on the surface of the earth has a mass of 50 kilograms and a weight of 490 N. If the woman were floating freely inside a space habitat far away from earth she would have
less weight and the same mass
An object that has potential energy may have this energy because of its
location
which are scalar quantities
mass volume and speed
the air in this room has
mass wight and energy
If an object has kinetic energy then it also must have
momentum
which is most responsible for the ocean tides
moon
10 seconds after starting from Rest an object falling freely downward will have the speed of about
more than 100 m/s
which of the folioing are electrically neutral
neutron
if you push far an hour against a stationary wake you do no work
on the wall
the tangential velocity of an earth satellite velocity
parallel to the surface of the earth
as a ball falls the action force is the pull of the earths mass on the ball the reaction force is the
pull of the balls mass on the earth.
a suction cup sticks to a wall it is
pushed to the wall by the atmoshpere
a rifle recoils from firing a bullet the speed of the rifles recoil is small because the
rifle has much more mass that the bullet