Potential Energy
A cinder block sits on a platform 20 m high. If it has a mass of 8 kg, find its energy.
1,568J
Lauryn serves a volleyball with a mass of 2.1 kg. The ball leaves her hand with a speed of 30 m/s. Find the energy of the ball.
945 J
toasting a piece of bread
Electric -> thermal
Stored energy is....
Potential energy
What type of potential energy does a sandwich have?
Chemical
A baby’s car seat sits on top of a bench 2 m tall. The baby and the car seat have a weight of 12 N. Find the energy of the baby and its car seat.
24 J
A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.
896,000 J
charging your phone
Electric -> light/ sound
Energy in motion is....
Kinetic energy
Where would a roller coaster have the most potential energy, the top of a hill, middle of the hill, bottom of the hill?
Top of the hill
What is the potential energy of a 2 kg plant that is on a windowsill 1.3 m high?
25.5 J
What is the kinetic energy of a 7.26 kg bowling ball that is rolling at a speed of 2 m/s?
14.52 J
Windmill
Kinetic -> electric
Potential energy + kinetic energy is called
mechanical energy
Two cars have the same velocity, but #1 has a mass of 100 kg, and #2 has a mass of 150 kg. Which has more energy?
#2
An apple has 6 J of energy. The apple sits on a counter 3 m high. What is the mass of the apple?
0.204 kg
What is the mass of an object that has 324 J of energy and is moving at a speed of 9 m/s?
8 kg
Warming your hands by the fire uses
thermal energy
When a ball is dropped, energy converts from __________ to ________
potential to kinetic
A bell hanging at the top of a tower has 8,550 J of energy. If it has a mass of 20 kg, find the height of the bell.
43.6 m
A person is running 4 m/s with 448 J of energy, what is their mass?
56 kg
electric -> thermal -> chemical OR
electric -> thermal -> kinetic -> chemical
Phone signal, radio, and satellite
Electromagnetic
The law of conservation of energy states that energy cannot be ___________ or __________
created or destroyed