Energy
Energy is never made. It is only transformed or transferred.
In class, you learned about five forms of energy: light energy, mechanical energy, thermal (heat) energy, electrical energy, sound energy. We learned that all energy has a source. For example, sources of light are the Sun, a lamp, a headlight, etc. Sources of mechanical energy are a person pushing a box, water flowing, etc. Both heat energy and electrical energy can also either travel easily through a conductor or be confined because of an insulator. (There are websites on the Resources page that will give you practice with this concept.)
Light energy = carried by light
Mechanical energy = motion or movement
Thermal energy = heat
Electrical energy = power/electrical charges
Sound energy = vibrations/waves
In class, you learned about five forms of energy: light energy, mechanical energy, thermal (heat) energy, electrical energy, sound energy. We learned that all energy has a source. For example, sources of light are the Sun, a lamp, a headlight, etc. Sources of mechanical energy are a person pushing a box, water flowing, etc. Both heat energy and electrical energy can also either travel easily through a conductor or be confined because of an insulator. (There are websites on the Resources page that will give you practice with this concept.)
Light energy = carried by light
Mechanical energy = motion or movement
Thermal energy = heat
Electrical energy = power/electrical charges
Sound energy = vibrations/waves
Forces
Force is a push or pull. There are many factors that act upon objects that causes them to move, whether it be accelerating, stopping, or changing direction. For every action there is a reaction. The fact that things don't float around on Earth is because of gravity, which pulls everything to the center of the earth. An object with more (greater) force can cause an object to change direction or stop. Friction provides a force in the opposite direction of motion. Physical properties of material that makes contact with an object can cause friction. If the material's texture is bumpy or rough, the friction is increased. If the texture is leveled or smooth, friction is decreased. Magnetism can also affect the force of objects, but those objects must attract a magnet, and must be iron, steel, or nickel.
Look at the picture below and answer the questions that follow:
Look at the picture below and answer the questions that follow:
Now, consider the following:
If a person or object pushes an object, how is the their force affecting the object?
What happens to a car's speed if it travels down a bumpy road?
What causes force to stop?
If a person or object pushes an object, how is the their force affecting the object?
What happens to a car's speed if it travels down a bumpy road?
What causes force to stop?