2006 Spring Physical Science Final

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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
Frequency is th: Frequency

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Number of cards 97