quizziz

Light energy from the sun is transformed into chemical energy in the plant. The chemical energy in the plant is transferred to the rabbit. Chemical energy in the rabbit is transferred to the fox.

Explain how energy is transferred and/or transformed from the sun to power the food chain.

An object's mechanical energy increases as its speed/velocity increases.

How does an object's mechanical energy change as its speed (velocity) increases?

An object's thermal energy decreases as its temperature decreases.

How does an object's thermal energy change as its temperature decreases?

Energy is transferred from the stove to the pot to the water inside the pot.

How is energy being transferred when a stove heats up a pot of water?

The chemical energy in gasoline is transformed into mechanical energy of the car (when the car moves).

How is energy transformed when a car uses gasoline to power its motion?

KE= 1/2 x 10 kg x (20 m/s)2 = 2000 J

If a 10kg object is traveling 20 m/s. how much kinetic energy does the object have?

PE = 20 kg x 9.81 m/s2 x 10 m = 1,962 J

If a 20 kg object is held 10 meters above the Earth's surface, how much potential energy does the object have? Show your work. (Remember: PE = mgh, g = 9.81 m/s2)

energy can be transferred or transformed, but it is always conserved

What happens to energy during a collision?

Kinetic energy is conserved during an elastic collision. Kinetic energy is not conserved during an inelastic collision--kinetic energy is transformed into other forms of energy.

What happens to kinetic energy during an elastic collision compared to an inelastic collision?

an interaction between objects that physically touch each other

What is a collision?

the rate at which energy used

What is power?

Chemical energy is energy stored in the bonds between atoms on a substance. Nuclear energy is energy stored in the nucleus of an atom.

What is the difference between chemical energy and nuclear energy?

sun

What is the source of all energy on Earth?

applying a force to move or change something

What is work?

mechanical energy

What type of energy is associated with an object's motion or position?

light energy

What type of energy is carried by electromagnetic radiation, such as radio waves, UV light and x-rays?

chemical energy

What type of energy is stored in food and fuel?

All of the above

What unit tells you how much energy is needed, stored or applied to perform work?

an inelastic collision

A car traveling at 20 m/s crashed into a tree. The car comes to a complete stop. This is an example of:

energy transformation

The conversion of energy from one form to another is called:

the ability to do work

What is energy?

energy cannot be created or destroyed, but it can change form

According to the Law of Conservation of Energy:

increases

As an object is raised higher above Earth's surface, its (gravitational) potential energy.

At position 2, the cart's potential energy is highest and kinetic energy is lowest. At position 4, the cart's potential energy is lowest and kinetic energy is highest.

Compare the rollercoaster cart's kinetic and potential energy at position 2 to position 4.

the change in the objects' motions indicates that the energy of the object is changing

During a collision, the motion of the objects changes. What does this indicate about the object's energy?

an object vibrates

Sound energy is created when:

energy transfer

The movement of the same form of energy from one object to another is called:

the sum of the kinetic and potential energy

The total mechanical energy of an object equals:

an elastic collision

Two balls move towards each other and collide. They bounce off each other and move in opposite directions with the same speed they initially had. This is an example of:

d

Which graph best shows the relationship between an object's velocity and kinetic energy?

Energy of the ball is dissipated to the surroundings

Which of the following explains why a ball rolling on a table eventually comes to a stop?

kinetic energy

Which of the following is energy to motion?

b

Which spring doe NOT have elastic potential energy?