Guys,
Today we looked at Newton's 1st reading packet again. Some important things we discussed were...
- definition of force
- what net force is
- the difference between balanced/unbalanced forces
- Newton's 1st law of motion
- the different types of friction
Force - This is either a push or pull of an object. It is always measured in Newtons (N) after Sir Isaac Newton.
Net Force - This is the combination of all the forces acting on A SINGLE object. Look at the diagrams below to better understand net forces.
In the diagrams below, the one on the left, you would subtract to the two forces because they are in opposite directions giving you a net force = 0. These are also called balanced forces.
In the middle diagram, since both forces are going in the same direction you add them together so the total force on the box is 10 Newtons. This is also called a unbalanced force.
In the diagram on the right, the two forces are in opposite directions so you subtract them to find the total force acting on the object, which is 2 Newtons. Since this is an unbalanced force and there is more force going right, the block will move in that direction.
Once again, Newton's 1st Law states -
An object in motion stays in motion while an object at rest will stay at rest unless acted upon by an outside force.
Today we looked at Newton's 1st reading packet again. Some important things we discussed were...
- definition of force
- what net force is
- the difference between balanced/unbalanced forces
- Newton's 1st law of motion
- the different types of friction
Force - This is either a push or pull of an object. It is always measured in Newtons (N) after Sir Isaac Newton.
Net Force - This is the combination of all the forces acting on A SINGLE object. Look at the diagrams below to better understand net forces.
In the diagrams below, the one on the left, you would subtract to the two forces because they are in opposite directions giving you a net force = 0. These are also called balanced forces.
In the middle diagram, since both forces are going in the same direction you add them together so the total force on the box is 10 Newtons. This is also called a unbalanced force.
In the diagram on the right, the two forces are in opposite directions so you subtract them to find the total force acting on the object, which is 2 Newtons. Since this is an unbalanced force and there is more force going right, the block will move in that direction.
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| Net Force = 0 N Net Force = 10 N Net Force = 2 N |
Newton's 1st Law of Motion
An object in motion stays in motion while an object at rest will stay at rest unless acted upon by an outside force.
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| Photo courtesy of http://gvc.gvsd.ca |
Looking at the motorcycle rider above, he clearly illustrates what Newton was talking about. His body continues to move forward while his bike was acted upon by another force (the wall).
Friction is a force that is present everywhere in the world around us. It is the force that acts against the object in motion to make it come to a stop. This force is always OPPOSITE the direction in which the object is moving.
We learned that there are 3 types of friction...
Static - When an object is at rest and this is the force that you must use to have it begin moving. It is the greatest of the friction forces. Ex. Moving a refrigerator requires a lot of force to get it to start moving.
Sliding - When an object is moving (sliding) and it is the force that will cause the object to stop. The key to this type of friction is that the object is already moving but only slightly because it is sliding. It is the medium type of friction force. Ex. A book on a desk will come to rest shortly after you have stopped pushing it.
Rolling - When an object is moving (rolling) and it is the force that will make it come to a stop. This object is moving and circular in shape which allows this type of friction to be the lowest type of friction force. Ex. A bike will come to rest after you stop pedalling but it will take much longer than the book to stop with sliding friction.
Friction is a force that is present everywhere in the world around us. It is the force that acts against the object in motion to make it come to a stop. This force is always OPPOSITE the direction in which the object is moving.
We learned that there are 3 types of friction...
Static - When an object is at rest and this is the force that you must use to have it begin moving. It is the greatest of the friction forces. Ex. Moving a refrigerator requires a lot of force to get it to start moving.
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Photo courtesy of www.coppengerfamily.com
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| Image courtesy of www.tutorvista.com |
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| Photo courtesy of http://ummascorner.blogspot.com |
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