Kinetic Energy
What is the definition of kinetic energy?
Energy of motion
What is the definition of potential energy?
Stored energy
How do you calculate velocity for the KE equation? (with units)
distance (m)/ time (s)
What is the GPE of an object with a mass of 0.5kg that is dropped from a height of 5m? (assume gravity is 10m/s2)
25J
What unit is KE measured in?
Joules (J)
What unit is PE measured in?
Joules (J)
What are the 3 variables (with units) you need to calculate PE?
mass (kg), gravity (9.8m/s2), height (m)
What is the KE of an object with a velocity of 2m/s and a mass of 5kg?
10J
What is the equation for KE?
KE= 1/2mv2
What is the equation for (G)PE?
PE= mgh
What do you need to calculate KE? (with units)
mass (kg) and velocity (m/s) OR time (s) and distance (m)
According to what law should KE=PE?
Law of Conservation of Energy
Which of the following is not a type of kinetic energy?
- thermal
- sound
- radiant
- elastic
Elastic Energy is not Kinetic Energy
Which of the following is not a type of potential energy?
- chemical
- nuclear
- thermal
- gravitational
Thermal Energy is not Potential Energy
What is a big factor of why your GPE does not equal your KE in the Car Track Labs?
Friction (thermal energy)
A car goes down the ramp and has a PE of 0.5J. The KE is calculated and equals 0.3J. What happened here?
Some of the potential energy was transformed into thermal energy due to friction.
Draw a diagram of where the maximum KE is for a pendulum?
In the center of the period, directly below the fixed point.
Draw a diagram of where the maximum PE is for a pendulum.
Top of the swing or end of the period.
What type of eclipse did we have on Monday?
Solar Eclipse
You need to find the kinetic energy of an object. It travels 10 meters in 5 seconds and has a mass of 4kg.
8J