Kinetic energy
Definition.
Kinetic energy is the energy that an object possesses due to its motion. Any object that is moving whether fast or slow has kinetic energy, and the amount of kinetic energy depends on how heavy the object is and how fast it is moving.
Key Points.
Only moving objects have kinetic energy.
Objects with more speed have more kinetic energy.
Objects with more mass have more kinetic energy.
If an object stops, the kinetic energy will go.
Definition.
Energy is the ability to do work or cause change.
Key Points.
Energy is the ability to do work or cause change.
Energy is needed for all activities.
Energy can be transferred from one object to another.
Energy can change from one form to another.
Energy cannot be created or destroyed, only changed.
Definition.
Friction is a force that opposes motion when two surfaces rub against each other.
Key points.
Friction happens when objects touch.
It slows down or stops moving objects.
It works opposite to the direction of motion.
It changes kinetic energy into heat.
How friction is connected to kinetic energy.
Friction is a force that opposes motion.
Moving objects have kinetic energy.
When friction acts, it slows the object down.
As the object slows, its kinetic energy decreases.
The kinetic energy is changed into thermal energy.
This is why surfaces warm up when things rub together.