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Transcript of force contact force noncontact force net force unbalanced forces balanced forces Newton’s first...
![Page 1: force contact force noncontact force net force unbalanced forces balanced forces Newton’s first law of motion 2.1 Combining Forces.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649f345503460f94c50c82/html5/thumbnails/1.jpg)
![Page 2: force contact force noncontact force net force unbalanced forces balanced forces Newton’s first law of motion 2.1 Combining Forces.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649f345503460f94c50c82/html5/thumbnails/2.jpg)
force
contact force
noncontact force
net force
unbalanced forces
balanced forces
Newton’s first law of motion
2.1 Combining Forces
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Force• When more than one force acts on an object, the combined
effect is caused by the sum of all applied forces.
2.1 Combining Forces
• A push or a pull on an object is a force.
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Contact and Noncontact Forces• A contact force is exerted only when two objects are
touching.
2.1 Combining Forces
• A noncontact force is exerted when two objects are not touching.
• Magnets exert a noncontact force on each other.
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Force is a Vector
• Vectors have magnitude and direction.
• Force has a direction and a magnitude.
• Force is measured in Newtons.
2.1 Combining Forces
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Combining Forces• When more than one force acts on an object, the
forces combine.
• The combination of all the forces acting on an object is called the net force.
2.1 Combining Forces
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Combining Forces in the Same Direction
• Forces are vectors and require a reference direction.
• When forces in the same direction combine, the net force is in the same direction and the size of the force is the sum of the forces.
2.1 Combining Forces
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Combining Forces in the Same Direction (cont.)
• If two people push the dresser to the right, the forces are added together.
2.1 Combining Forces
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Combining Forces in Opposite Directions
• When forces in opposite directions combine, the net force is in the direction of the larger force.
• The size of the net force is the difference between the two forces.
2.1 Combining Forces
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Combining Forces in Opposite Directions (cont.)
• Two people exerting a force in opposite directions show how vectors combine to create net force.
2.1 Combining Forces
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Unbalanced and Balanced Forces• If the net force on an object is not zero, it is an
unbalanced force.
• If the net force on an object does equal zero, it is a balanced force.
2.1 Combining Forces
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Balanced Forces
2.1 Combining Forces
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Balanced Forces and Motion• If two people push with the same force, the
dresser does not move.
2.1 Combining Forces
• The forces have the same magnitude.
• The forces are in opposite directions.
• The net force on the dresser is zero and the forces are balanced.
• The motion of the dresser does not change.
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Unbalanced Forces and Motion
• Unbalanced forces change motion.
• If two people push with different force, the dresser moves.
• The forces have a different magnitude and are in opposite directions.
• The net force on the dresser is not zero and the forces are unbalanced.
• The dresser moves in the direction of the larger force.
2.1 Combining Forces
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Newton’s First Law of Motion• If the net force on an object is zero, the velocity of
the object does not change.
• If the net force is zero and the object is at rest, it remains at rest.
• If the net force is zero and the object is moving, it continues to move in a straight line with constant speed.
2.1 Combining Forces
Newton’s Laws of Motion
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Inertia and Mass
• Mass is the amount of matter in an object.
• The more mass an object has, the more inertia it has and the harder it is to change its motion.
• A bicycle is easier to push than a car because it has less mass.
2.1 Combining Forces
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Lesson 1 Review
Which of the following changes occur when an unbalanced force acts on an object?
A motion
B mass
C inertia
D weight
2.1 Combining Forces
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Lesson 1 Review
What is the net force acting on a door if one person pushes to the right with a force of 2000 N and a second person pushes with a force of 1500 N to the right?
A 3500 N to the right
B 3500 N to the left
C 500 N to the left
D 500 N to the right
2.1 Combining Forces
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Lesson 1 Review
You are riding a bike. In which of the following situations are the forces acting on the bike balanced?
A You pedal to speed up.
B You turn at constant speed.
C You coast to slow down.
D You pedal at constant speed.
2.1 Combining Forces
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Balanced & Unbalanced Forces
• Balanced Skateboard Forces
• Draw the skateboard and the vectors in each direction to cause balanced forces.
• Unbalanced Frisbee Forces
• Draw the frisbee and the vectors in each direction to cause unbalanced forces.
• Unbalanced Skateboard Forces
• Draw the skateboard and the vectors in each direction to cause unbalanced forces.
• Balanced Frisbee Forces
• Draw the frisbee and the vectors in each direction to cause balanced forces.