forces chapter .10

1. 5 sections chapter.10 BY: Kellie Little :)

2. section.1 the nature of force A force is a push or a pull. A force is A force is a push or a pull. A force is described by its magnitude and by the described by its magnitude and by the direction in which it acts. A newtone is the direction in which it acts. A newtone is the SI unit for magnitude or strength of the SI unit for magnitude or strength of the force. (N) The combination of all forces force. (N) The combination of all forces acting on an object is called the net force. acting on an object is called the net force. When two or more forces in the same When two or more forces in the same direction, the net force is found by adding direction, the net force is found by adding the strengths of individual forces. the strengths of individual forces.

3. continue section.1 An unbalanced force will cause the velocity of an object An unbalanced force will cause the velocity of an object to change. The object can speed up,slow down,or change to change. The object can speed up,slow down,or change direction. Unbalanced forces acting on an object result in a direction. Unbalanced forces acting on an object result in a net force and cause a change in the object's velocity. When net force and cause a change in the object's velocity. When balanced forces are different. Equal forces acting on one balanced forces are different. Equal forces acting on one object in opposite directions are called unbalanced forces. object in opposite directions are called unbalanced forces. When equal forces are exerted in opposite directions there When equal forces are exerted in opposite directions there isn't a net force. Balanced forces acting on an object do isn't a net force. Balanced forces acting on an object do not change the objects velocity. not change the objects velocity.

4. Section.2 Friction,Gravity,and elastic forces The Strength of the force of friction depends on the types The Strength of the force of friction depends on the types of surfaces involved and how hard the surfaces push together. of surfaces involved and how hard the surfaces push together. Fiction is a force that two surfaces exert on each other when Fiction is a force that two surfaces exert on each other when they rub against each other. Types of fiction include they rub against each other. Types of fiction include static,rolling,sliding,and fluid friction. The friction that acts static,rolling,sliding,and fluid friction. The friction that acts on objects that are not moving is called static friction. sliding on objects that are not moving is called static friction. sliding friction occurs when two solid surfaces slide over each other. friction occurs when two solid surfaces slide over each other. When a object rolls across a surface,rolling friction occurs. When a object rolls across a surface,rolling friction occurs. Fluid friction occurs when a solid object moves through fluid. Fluid friction occurs when a solid object moves through fluid.

5. Continue section.2 The force of gravity between objects The force of gravity between objects increases with greater mass and increases with greater mass and decreases with greater distance. In decreases with greater distance. In freefall the force of gravity alone freefall the force of gravity alone causes an object to accelerate in the causes an object to accelerate in the downward direction. downward direction.

6. Section.3 Newton's first and second laws Newton's first law of motion states that an object Newton's first law of motion states that an object will remain at rest or moving at a constant velocity will remain at rest or moving at a constant velocity unless it is acted upon by an unbalanced force. unless it is acted upon by an unbalanced force. Inertia is the tendency of an object to resist a Inertia is the tendency of an object to resist a change in motion. Newton's second law of motion change in motion. Newton's second law of motion states that acceleration depends on the net force states that acceleration depends on the net force action on the object and on the objects mass. action on the object and on the objects mass.

7. Section.4 Newtons third law Newton's third law of motion states that if one object exerts Newton's third law of motion states that if one object exerts a force on another object,then the second object exerts a force a force on another object,then the second object exerts a force of equal strength in the opposite direction on the first object. of equal strength in the opposite direction on the first object. Momentum is a characteristic of a moving object that depends Momentum is a characteristic of a moving object that depends on both the mass and the velocity of the object. You can on both the mass and the velocity of the object. You can calculate the momentum of a moving object by multiplying the calculate the momentum of a moving object by multiplying the objects mass and velocity. The total momentum of any group of objects mass and velocity. The total momentum of any group of objects remains the same,or is conserved,unless outside forces objects remains the same,or is conserved,unless outside forces act on the objects. act on the objects.

8. Section.5 Rockets and Satelites A rocket can rise into the air because the gases it expels A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite with a downward action force exert an equal but opposite reaction force on the rocket. A satellite is any object that reaction force on the rocket. A satellite is any object that orbits another object in space. Any force that causes an orbits another object in space. Any force that causes an object to move in a circular path is a centripetal force. object to move in a circular path is a centripetal force. Satellites in orbit around earth continuously fall toward Satellites in orbit around earth continuously fall toward earth, but because earth is curved they travel around it. earth, but because earth is curved they travel around it.

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