f(16-1) how do forces affect us? vocabulary velocity force acceleration inertia
TRANSCRIPT
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F(16-1) How do forces affect us?
VocabularyVelocityForce
Accelerationinertia
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Describing Motion• All motion is the same in
certain ways. All motion is change in position.
• You can tell that something has moved if it’s position changes relative to something else.
• A stationary object or a group of objects used to determine a position change is called a frame of reference.
• A frame of reference is a point of view. It can change depending on the viewer.
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Describing Motion
• Speed is the distance something moves in a certain period of time.
• Speed = distance /time (km/hr).
• Speed tells how fast or slow an object’s motion is, but it doesn’t tell you the direction of motion.
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Describing Motion
• When you state the direction of a moving object as well as its speed, you’re stating its velocity.
• Velocity = speed with direction.
• An object’s velocity changes when there’s a change in its speed, its direction, or both.
• Scientists use arrows to represent velocity. The length of the arrow represents the speed measurement. The direction it points represents the direction measurement.
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What forces do
• A force is just a push or pull.• Gravity and magnetism are forces.• Forces act on objects. They slow things down,
speed them up, stop them, start them and turn them.
• Forces can change the object’s velocity.
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What forces do
• Change of velocity is called acceleration.
• Acceleration is an object’s change in velocity divided by the time it takes for that change to occur.
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What forces do
• Isaac Newton (1642-1727) is considered one of the greatest of all scientists.
• One of his laws states that the greater the force on an object, the greater its acceleration.
• This law also says that if two objects are acted on by the same force, the object with less mass accelerates more.
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Inertia
• An object won’t change its motion unless a force acts on it.
• This tendency of matter to resist a change in its state of motion is called inertia.
• The law of motion (law of inertia): An object at rest stays at rest, and an object in motion stays in motion at a constant velocity, unless an object is acted on by an outside force.
• This means; an object will not accelerate unless a force acting on it.
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Thank You