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96 Cards in this Set

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The motion of an object looks differnernt to observers in different...
frames of reference
The direction and length of a straight line from the starting point to the ending point of an object's motion is...
displacement
the SI unit for measuring _______ is meter.
distance
Displacement and velocity and examples of ________ because they have both magnitude and direction.
vectors
The sum of two or more vectors is called the...
resultant vectors.
Speed is measured in units of...
meters per second.
A car's speedometer measures...
instant speed.
v=D/t is the equation that defines...
average speed.
A constant slope on a distane-time graph indicates ________ speed.
constant
The difference between speed and velocity is that velocity indicates the ________ of motion and speed doesn't
speed
A distance-time graph indicates an object moves 20 km in 2 h. The average speed of the object is ______ km/h
10
Because its __________ is always changing, an object moving in a circular path experiences a constant change in velocity.
direction
Two or more velocities add by _________________
vector addition
A moving object does not ________ if its velocity remains constant
acceleration
Freely falling objects accelerate at 9.6 m/s squared because the force of_____________ acts on them
gravity
The velocity of an object moving in a striaght line changes at a constant rate when the object is expierencing constant___________
acceleration
The acceleration of a moving object is calculated by diiding the change in _______ by the time which change occurs
speed or velocity
Accelerated motion is represtented by a(an) ________ line on a distance-time graph
curved
A car that incrases its speed from 20 km/h to 100 km/h undergoes _________ acceleration
postive
___________ is how fast a velocity is changing at a specific time
instantaneous speed
A push or pull is an example of a(an)_________
force
The type of force measured by a grocery store spring scale is__________
weight
The sum of all the forced acting on an object is called the ____________
netforce
If the forced acting on an object produce a net force of zero, the forces are called __________
balenced forces
The force that oppeses the motion of objects that touch as they move pass each other is called ___________
friction
It usally takes more force to start an object sliding than it does to keep an object sliding because static frictin is usally ________ than sliding friction
greater
The two forces acting on a falling object are gravity and ________
air resistance
The path of motion of a thrown javelin is a example of
projectile
The tendency of an object to resist any change in its motion is called
inertia
During a head on auto collision____________ causes a passenger in the front seat to countinue moving _________
inertia, forword
The acceleration of an object is equal to the net _____ acting on the object divided by the objects ________
force, mass
The force of gravity acting on an object is the object's...
weight
If a golf ball and bowling ball are rolling at the same speed, the _______ ball has greater momentum
bowling
When you push on a wall, the ________ pushes back on you.
wall
In a closed system, the loss of momentum of one object ________ the gain in momentum of another object
equals
The observation that a charged object can attract or repel other charged objects led scientists to conclude that there are ____ types of charges
two
The universal force that is the most effective over the longest distances is...
gravity
The centripal force acting on the moon continuously changes the ___________ of the mooon's motion.
direction
Pressure is the result of force distributed over an...
area
The formula, Force/Area, is used to calculate...
pressure
The SI unit of pressure is the...
pascal
A pascal, the SI unit of pressure, is equal to 1 newton per...
square meter
A substance that flows and assumes the shape of its container is a...
fluid
As a liquid is added to a beacker, the pressure exerted by the liquid on the bottom of the beacker...
increases
The pressure exerted by a fluid at any given depth is exerted _________ in all directions.
equally
As your altitude increases, air pressure...
decreases
A hydraulic jack is an application of _______ principle
Pascal's
A device that uses pressurized fluids acting on pistons of defferent sizes to change a force is called a...
hydrolic system
As the speed of a fluid increases, the _______ within the fluid decreases
pressure
In a hydrolic lift system, the fluid pressure exerted throughout the system is
constant
The downward force produced when air flows over the winglike spoiler on a race car is an example of _____________ principle
Bournouli's
The apparent loss of weight of an object in a fluid is called ________
bouancy
The direction of the buoyant force on an object placed in a fluid is
upward
Even a rock at the bottom of a lake has a ____________ force acting upward.
bouyant
The unit g/cm3 is often used to express _______
density
As you climb a high mountain, the buoyant force exerted on you by the atmosphere _________
decreases
A submerged submarine alters its __________ to rise or fall in the water.
density
The weight of an object that sinks in a fluid is _________ greater than the buoyant force acting on it.
greater
For work to be done on an object, the object has to __________
move
Any part of a force that does not act in the direction of an object's motion does no ________ on an object.
work
The SI unit of work is
joules
You calculate work by multiplying the force acting in the direction of _______ by the distance the object moves.
motion
The rate at which work is done is called
power
The SI unit of power is
watt
The watt and the horsepower are both units of
power
A machine is a device that changes a
force
A device that changes the size or direction of force used to do work is called a
machine
The force that is exerted on a machine is called the ________ force
input
Besides a reduction in friction, the only way to increase the amount of work output of a machine is to ________ the work input
increase
The ________________ of a machine is the number of times that the machine increases the input force.
mechanical advantage
The mechanical efficiency of any machine is always _______ than 100 percent
less
A _________ can be described as an inclined plane wrapped around a cylinder
screw
The fulcrum is always between the effort force and the resistance force in a ________-class lever
first
The ideal mechanical advantage of a third-class lever is always ________ than 1
less
As the thickness of a wedge of given length increses, its IMA
decreases
Two or more simple machines working together make up a __________ machine
compound
A watch consists of a complex systems of gears. Each gear acts as a continuous
lever
Energy of an object increses when ____________ is done on the object
work
Energy and work are measured in the SI unitcalled the
joule
If the ________ of an object doubles, its kinetic energy doubles
mass
The kinetic energy of an object is propotional to the sqare of its
speed
Energy that is stored due to position or shape is called _________ energy
potential
When a pole-vaulter flexes the pole, the pole-vaulter increases the pole's __________ potential energy
elastic
You can calculate an object's gravitational potential energy by using the equation
potential energy = mass x acceleration of gravity x height
Mechanical energy does not include kinetic energy of ______ energy
chemical
The sum of the kinetic energy and potential energy of an object is called its _______ energy
mechanical
All energy can be considered as kinetic energy, _________ energy or the energy in fields.
potential
Wind turbines comvert ________ energy into electrical energy
kinetic
the process of changing energy from one form to another is called energy _____________
conversion
"Energy cannot be created or destroyed" is a statement from the law of
conservation of energy and mass
When an apple falls from a tree to the ground, the apple's beginning kinetic energy and ending gravitational potential energy are both equal to
0(zero) joules
In the equation E = mc2, c is the speed of
light
Energy resources that exist in limited amounts and, onece used, cannot be replaced except over the course of millions of years are called ___________ energy resources
non-renewable
Flat collector plates through which water flows are found in ___________ solar energy systems
active
Geothermal energy, in addition to being renewable, offers the benefit of being
non-polluting
Turning off unused lights or appliances is an example of energy
conservation