Formulas
Given the formula of kinetic energy (KE=0.5 x m x v2) Calculate this: You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30m/s.
0.5 x 2.1 x 302 = 945j
What is friction?
An object moves at a constant velocity unless acted upon by an external force
What is kinetic energy?
The energy of motion.
What is potential energy?
The energy stored in an object or substance.
What is heat?
Heat is the quality of being hot; high temperature.
Given the formula of potential energy (PE=m x g x h) Calculate this: A baby carriage is sitting at the top of a hill that is 21m high. The carriage with the baby has a mass of 1.5kg.
1.5 x 10 x 21= 315j
What is friction caused by?
Kinetic energy and heat
Kinetic energy is the energy an object has due to its ________?
What is Motion?
What is the unit of measure Potential energy can be measured?
Potential energy can be measured in Joules.
What is Heat is caused by?
Kinetic Energy?
Given the formula of kinetic energy (KE=0.5 x m x v2) A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg.
0.5 x 1120 x 402=896,000j
If you push a coin why would it stop moving?
The coin stops because the friction slows it down to a point where it eventually stops.
What is the standard unit of measurement for kinetic energy?
Joules (J)
How can gravitational potential energy be calculated?
It can be calculated using the formula: PE= mgh
What is Temperature?
The measure of average kinetic energy within a substance
What is the formula for velocity?
Displacement/Time
What does friction do?
Friction acts to transfer the kinetic energy of a moving body to the surface it comes in contact with
The ______ an object moves the ______ kinetic energy it has….
What is Faster (first blank) and More (second blank)?
What is gravitational potential energy?
The potential energy that exists between two objects that exert a gravitational pull on each other.
When Kinetic Energy in a substance _________, heat rises/increases
Increases?
What is the formula for frictional force?
The coefficient of Friction x Normal Reaction Force
Any loss of _____, as a result of opposition of motion, by friction, must be transferred in some way or another.
Kinetic energy?
What is the equation for kinetic energy?
KE= 0.5 • m • v2
What is one thing that takes part in gravitational potential energy?
The Earth takes part in gravitational potential energy.
When kinetic energy in a substance decreases, ____ lowers/decreases
heat?