Energy, Work, Machines, Simple Machines Flashcards
_______ stored energy due to position
potential energy
_______ is energy stored in food and fuels
chemical potential energy
_______ is energy stored by things above Earth
gravitational potential energy
_______ is the ability to cause change
energy
_______ is energy in the form of motion
kinetic energy
_______ is energy stored by things that stretch
elastic potential energy
the amount of energy a moving object has depends on the _______ and its ______
mass and velocity
the sun gives off what two forms of energy?
radiant and thermal
what is the formula for work?
work= distance x force
what is the formula for power?
power= work/distance
An electric blanket warms you on a cold evening. How did energy change form?
electric -> thermal
A pile of logs is burned for a campfire. How did energy change form?
chemical potential energy -> light and thermal energy
Your car seat is hot after sitting outside in the sun all day. How did energy change form?
potential energy -> thermal energy
You eat an orange during half-time during a soccer game How did energy change form?
potential energy -> chemical potential energy
what is the difference between input and output force?
input force is force applied to a machine and output force is force applied by a machine
what are two ways machines make work easier?
fixed pulley and moveable pulley
how can machines be made more efficient?
by reducing friction
How does using a ramp put items in a truck make work easier?
it reduces the amount of force required to do work
An inclined plane wrapped around a cylindrical post is a(n) _________________
screw
A winding mountain road is an example of a(n)____________
lever
When two or more simple machines work together, they are called a(n) ______________
compound machine
A system of pulleys is called _______________
block and tackle
The Law of Conservation of Energy states that ___________________
energy may change form, but cannot be destroyed or created under ordinary conditions
Marquis is standing with his back towards a campfire, He notices that his back is much warmer than his chest. He knows the heat energy is being transferred from the fire and this method of energy transfer can happen even if no air is present. This method of heat energy is _________________
thermal energy
When you hold an ice cube in your hand, it feels cold because _____________
the heat from our hand transfers to the ice cube (idk)
The main method of heat transfer that occurs in water is called ___________________
convection
If a copper wire with a wooden handle being held over a flame what will most likely happen after a couple of minutes?
it would heat the wire
The direct transfer of heat from one substance to another substance that is touching is _________________
conduction
How do you know when the transfer of thermal energy has ended?
when it cools down
During the day, sand at the beach is very warm. At night, the sand is cooler. Why does this occur?
the sun gives off thermal energy
When you use a flashlight, you produce light and ___________ energy.
radiant energy
Swinging a baseball bat is an example of a ____________ lever.
3rd class lever
How does using a hammer to nail boards together make work easier?
it increases the force from the hammer and applies it to the nail
