Physics is the science that studies motion and matter and how both work with forces and energy. It is a really big subject that has a lot of different “branches” of scientific study that include motion, sound, waves, electricity, light, sound, and even astronomy.
This science covers the tiniest particles and atoms all the way to the largest objects in the universe.
Friction is what we refer to when one object rubs against another object and causes resistance. Friction acts in the opposite direction and works against the motion.
When an object slides across another object it begins to slow down due to friction. It loses energy, but the energy doesn’t go away. Instead, the energy changes from “moving energy” which is also called “kinetic energy” to heat energy.
We see friction in many of the things that we do every day. Examples of friction can include:
Friction that causes heat energy isn’t always a good thing. We have a lot of things in our life that help to prevent friction from happening. The wheel on your bike reduces friction by the rolling action.
Machines need to keep from overheating due to friction, so they use oil, grease, or lubricants. Other ways to keep friction down is by using materials that reduce friction such as the rubber on tires or the metal used for the ice skate blades.
These special materials are said to have different “coefficients of friction” or the ability to keep friction at a minor amount.
But friction can be very useful! Friction keeps our bodies steady as we walk or run and is helpful when we climb up a hill or even make a fire when we are camping.
Some materials are smoother or rougher than others and their surfaces can create different friction amounts.
You can see this happen when you ride your bike on a really smooth road and notice that the ride is faster and easier than on a bumpy, lumpy road. Surfaces that have less resistance will let you move faster.
When thinking about friction there are two main factors to consider: The surface roughness, which is called the “coefficient of friction” and the force that is exerted between the two objects.
Each one can make a difference in how friction plays out with the results. If you set up a tray and put sand on one half and a number of objects to slide down both the sandy and non-sandy side, you can see that with little effort, the items move down the tilted tray faster on the non-sandy side.
But if you give those objects on the sandy side a harder push that can increase the speed, even with the friction of the sand and the object.
What is the definition of friction?
what we refer to when one object rubs against another object and causes resistance
What are the three types of friction?
dry, fluid, and rolling
What are the two main factors to consider when talking about friction?
surface roughness and force
What important function does friction have in our daily lives?
keeps us and everything else from sliding and rolling around
When you walk across a carpet in winter or dry weather, you are creating friction and this can also create what type of energy that surprises and shocks you?