Graphing
When graphing KE and mass, what type of graph would you except to see?
Linear
What is the formula for KE?
KE=1/2mv2
What is the formula for PE?
PE=mgh
Energy is the ability to do...
Work
What is the phase change from gas to liquid called when KE decreases?
Condensation
When graphing KE and velocity, what type of graph would you expect to see?
Exponential
Kinetic energy is the energy of ___________?
motion/movement
Potential energy is ____________ energy.
stored
When water freezes do the molecules have more or less KE?
less KE
What is the phase change for liquid to gas called when KE of molecules increases?
Boiling/evaporation/vaporization
Why does a graph of KE vs Velocity have a curved line?
In the equation KE=1/2mv2, the velocity has an exponent. This causes the curved graph.
A bowling ball of mass 18kg is rolling at a rate of 2m/s. A golf ball of mass 2kg is rolling at a rate of 6m/s. Which has the greater KE?
They have the same KE.
How can you increase the potential energy of an object?
Increase its mass or its height above ground.
Which object would you expect to have the higher KE, if they are both rolled with the same velocity? a golfball or a softball?
Match the form of measure to its units:
Speed-
mass-
time-
speed- m/s
mass- kg
time- s
When a you swing on a swing set you go back and forth. at what point in your swing would you experience the greatest PE?
At the top of your swing on either side/highest point of swing
To calculate the KE of a moving object you need to know what two things about the object?
mass and velocity
Match each of the following to the type of potential energy it has:
A rubber band-
a slice of pizza-
a star-
a water tower high above ground-
a bolt of lightening-
A rubber band- elastic
a slice of pizza- chemical
a star- nuclear
a water tower high above ground- gravitational
a bolt of lightening- electrical
What does the law of conservation of energy say?
Energy cannot be created of destroyed, it changes from one form to another
Match each unit of measure to its units:
Acceleration-
distance-
energy-
acceleration- m/s2
distance- m
energy- J
When a you swing on a swing set you go back and forth. at what point in your swing would you experience the greatest KE?
The lowest point of the swing/near the ground
A fired bullet has a KE of 2567J and a thrown baseball has a KE of 237J. Which has the great KE and explain why? (think about variables of the formula)
the bullet has more KE because it has a greater velocity
A coconut is 5m above the ground and weighs 6kg. Assume 10m/s2 for gravity. Calculate the PE of the coconut.
300J
During a tornado a piece of wheat straw is driven into a tree. How could the wheat have enough KE to do this?
The tornado increased the wheat straws velocity.
Trace the energy transfer of a pot of boiling water starting at the source of the energy all the way to the air molecules around the pot of water.
The heat energy of the burner is transferred to the pot which transfers the heat to the water which transfers the heat to the air above the pot.