Kinetic Enegry
What is kinetic energy?
An objects energy due to its position
If mass decreases, kinetic energy will...
What is decrease?
Unit used to measure energy
What is joules?
What does the Law of Conservation of Energy state?
What is Energy cannot be created or destroyed; it can only be transformed from one form to another.
A bowling ball has more kinetic energy than a tennis ball because?
What is the bowling ball has greater mass?
A bowling ball has less potential energy on the moon, why?
What is gravitational potential energy?
An object at rest has this amount of kinetic energy.
What is zero joules?
Give an example of an object with kinetic energy.
What is Any moving object: a car, a running person, a flying bird, a rolling ball, etc.
A ball is dropped from a height. As it falls, what happens to its potential energy and kinetic energy?
WHAT IS Potential energy decreases as the ball falls; kinetic energy increases. The total mechanical energy stays the same.
A car travelling at 60 mph has more kinetic energy than the same car travelling at 30 mph, why?
What is velocity (speed)?
Two factors that influence potential energy
What is height and mass
A 2 kg object is moving at 4 m/s. Calculate its kinetic energy.
KE=1/2*(2)(42)=1/2*(2)(16)=
WHAT IS 16 J
Why does a ball bounce lower each time it hits the ground?
What is Energy is lost to the surroundings and gravity.
When you compress a spring, energy is stored as this type of potential energy.
What is elastic potential energy?
The two factors that impact kinetic energy
What is Mass and velocity
A boulder sits at the top of a cliff. Explain why it has potential energy even though it's not moving.
WHAT IS it has the potential to fall and convert that stored energy into kinetic energy; it has energy due to its position.
A ball is moving with an energy of 50,000J, suppose it travels at 100m/s. Find the MASS of the ball.
What is 10Kg
A pendulum swings back and forth. At what point does it have the most kinetic energy? The most potential energy?
What is the most KE at the bottom (lowest point)
Why do your hands feel warm after rubbing them together?
What is friction converts kinetic energy into thermal energy?
The formula for kinetic energy
What is KE = ½ mv²
A bow and arrow has stored energy when it is pulled back because
What is elastic potential energy?
A 1,500 kg car is traveling at 20 m/s. Calculate its kinetic energy. How much kinetic energy would it have if it slowed to 10 m/s?
What is...
At 20 m/s: KE=1/2*(1500)(202)=300,000 J
At 10 m/s: KE=1/2*(1500)(102)=75,000 J
Explain how a hydroelectric dam generates electricity using potential and kinetic energy.
WHAT IS Water stored high up has gravitational PE; as it falls, PE converts to KE; the moving water spins turbines to generate electricity.
When you turn on a light, electrical energy changes into these two forms.
What are light energy and heat energy?