# 2006 Spring Physical Science Final

## Terms

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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