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### 89 Cards in this Set

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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% -------------------- 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