Machines and Energy

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What is stored energy called?: Potential energy
What kind of energy is in an automobile battery?: Potential energy
What is energy due to an object's position relative to the ground called?: Gravitational potential energy
The kinetic energy of an object depends on its: a. mass and speed b. mass and height c. height and speed d. mass and potential energy: Mass and speed
The law of conservation of energy states that energy can: a. be used up b. change c. be created d. be destroyed: Change
What kind of energy does a diver standing on the end of a platform have?: Gravitational potential
What are kinetic energy and potential energy measured in?: Joules
A working pendulum: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Converts potential energy into kinetic energy
The water at the top of the Hoover Dam: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Has potential energy
A bullet passing through an apple: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Has kinetic energy
A diver standing on the platform: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Has gravitational potential energy
A roller coaster in motion: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Converts potential energy into kinetic energy
A girl on a swing (moving): a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Has kinetic energy
A skier on the top of the hill: a. has kinetic energy b. has gravitational potential energy c. converts potential energy into kinetic energy d. has potential energy: Has potential energy
An instrument that makes work easier: Machine
What are the 2 types of work involved in using a machine?: Work input and work output
What is the force that is applied to the machine - effort force?: Work input
What is the work done by the machine?: Work output
What is the force which opposes the effort force?: Resistance force
What kind of force is the weight of an object being moved?: Resistance force
What is the measurement of how much input is available for work output?: Efficiency
Is work output more or less than work input?: Less
Why is work output always less than input?: Some degree of work is always wasted
An ideal frictionless machine would have how much efficiency?: 100%
Can efficiency be greater than 100%: No
Name 3 ways machines help do work: Increase the force applied to an object
Change the direction of a force
Increase the distance through which a force moves
What is the formula for efficiency?: E = useful work output x 100%
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work input
How is the answer for efficiency expressed?: % = as a percentage
What is the number of times a machine multiplies the effort force?: Mechanical advantage
What is the formula for mechanical advantage?: resistance force/effort force
Name the 6 types of simple machines: inclined plane
wedge
screw
lever
pulley
wheel and axle
What kind of machine does work in one movement?: Simple machine
How many kinds of simple machines are there?: 6
What machine has a straight slanted surface that connects one level to another?: Inclined plane
What machine is made up of 1 or 2 slanted forces or inclined planes?: Wedge
What machine is made up of an inclined plane wrapped around a bar or cylinder, to form a spiral?: Screw
A lid on a jar or a nut and bolt are examples of what kind of simple machine?: Screw
What machine is a rod or bar that pivots around a fulcrum?: Lever
What is the point at which a lever turns or pivots?: Fulcrum
What is the force exerted on a lever?: Effort force
What is the force exerted against the lever?: Resistance force
A screwdriver used to open a paint can is an example of which kind of lever?: 1st class
A nutcracker and wheelbarrow is an example of what kind of lever?: 2nd class
A baseball pitcher or using a fishing pole is an example of what kind of lever?: 3rd class
Resistance and effort are on opposite sides of the fulcrum is what kind of lever?: 1st class
The fulcrum is at the end of the lever is what kind of lever?: 2nd class
The fulcrum is at one end with the effort in the middle is what kind of lever?: 3rd class
What is a rope, cord, or chain wrapped around a grooved wheel called?: Pulley
What kind of machine would be used to lift a large amount of weight?: Pulley
What kind of machine is made of an axle, which is a rod or shaft, and an attached wheel?: Wheel and axle
A door knob, bicycle, and Ferris wheel are examples of what?: Wheel and axle
What is a combination of 2 or more simple machines?: Compound machine
A washing machine, VCR, vacuum are examples of what kind of machine?: Compound machine
What is the ability to do work called?: Energy
When an object or organism does work, what are they using?: Energy
When work is done on an object, what is given to the object?: Energy
When you kick a football, you give the ball some energy to mvoe
What are the 5 forms of energy?: Mechanical
Heat
Chemical
Electromagnetic
Nuclear
What kind of energy is associated with motion?: Mechanical
What kind of energy is caused by the internal motion of atoms?: Heat
What kind of energy is required to bond atoms together?: Chemical
What kind of energy lets moving electric charges have the ability to do work?: Electromagnetic
What kind of energy comes from the nucleus of an atom?: Nuclear
What kind of energy is blood flowing through blood vessels, wind, walking, hitting: Mechanical
What kind of energy causes changes in temperature?: Heat
What kind of energy is produced as particles move faster?: Heat
What kind of energy is released when bonds are broken?: Chemical
Light, xrays, radio waves, laser lights are examples of what kind of energy?: Electromagnetic
When the nucleus splits, nuclear energy is released in the form of what?: Heat energy and light energy
What do you call the energy of motion?: Kinetic energy
What does "kinetic" mean?: Motion
Kinetic energy depends on what?: An objects speed and mass
If the speed of an object doubles, what happens to kinetic energy?: It becomes 4 times greater
What is the equation for Kinetic energy?: KE = mass x velocity2 / 2
What is energy in an inactive or stored form called?: Potential energy
A stretched rubber band is an example of what kind of energy?: Potential energy
What do you call potential energy due to an object's position relative to the ground?: Gravitational Potential Energy
Gravitational potential energy depends on: a. height and weight b. height only c. weight only d. mass and velocity: Height and weight
What is the equation for Gravtitional potential energy (GPE)?: GPE = weight x height
GPE = W x H
Changes in the forms of energy are called what?: Energy conversions
What is the most common change in forms of energy?: Changing potential energy to kinetic energy or kinetic energy to potential energy
What happens to the total amount of energy when energy changes forms?: It stays the same
A toaster changes electrical energy to what kind?: Heat
A blender changes electrical energy to what kind?: Kinetic
What do you call: Energy can be transformed from form to another, but energy will never be created or destroyed when the energy transformation takes place: The Law of Conservation of Energy
What kind of energy causes ice cream to melt?: Heat energy
When you start a fire in a charcoal grill, what kind of energy is used?: Chemical energy
The sun's energy used by green plants is an example of what kind of energy conversion?: Light energy converted to chemical energy
What would be an example of kinetic energy continuously being changed back to potential energy?: Jumping on a trampoline
Potential energy is energy that is: a. stored b. in motion c. not capable of doing work: Stored

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Number of cards 89