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67 Cards in this Set
- Front
- Back
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Motion
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When a object changes place overtime relative to a reference point
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Refrence Point
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An object that appears to stay inplace
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How can you describe the direction of an object's motion with a refrence direction?
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North, South, East, West, Up, or Down
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What are 3 examples of refrence points?
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Earth's surface, trees, and buildings. (Any non-moving object)
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Why can a moving object be used as a reference point?
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Because you can object move positionsin relation to the moving object.
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Speed
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How fast or slow an objects moving
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What is the formula for average speed?
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Average speed= Distance/Time
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What does speed depend on?
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Distance traveled and the time taken to travel
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Velocity
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The speed of an object in a particular direction
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What makes speed and velocity different?
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Velocity includes a reference direction. (Goes in one place)
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What can velocity be also know as?
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A rate of change of an objects position.
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How can velocity be constant?
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If the speed and direction DONT change
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What is constant velocity?
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Motion along a straight line
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What is the formula for resultant velocity of objects moving the same direction?
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You add the 2 velocities
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What is the formula for resultant velocity of objects when they are movieng different directions?
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You subtract the smallest velocity from the biggest
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When you find the resultant velocity of object moving in different directions, what direction is it going?
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The direction the biggest velocity was going
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Acceleration
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The speed at which velocity changes
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When does acceleration occur?
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When speed, velocity, or both change
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Positive acceleration
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An increase in velocity
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Negative acceleration
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A decrease of velocity
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What is acceleration other than how much velocity changes?
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The speed of velocity
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Whats the formula for average velocity?
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Average Acceleration=Vf-Vi/time it takes to change velocity
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Why is an object that's moving in a circle accelerating?
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Because it continues to change direction consistently
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What 2 things must you need to determine time?
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Distance and time
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Force
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A push or pull enforced on an object
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For any push to occur what has to happen?
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Something has to recieve the force a.k.a push
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If force is acting on an object, what needs to happen for the object not to move?
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Force needs to come from both sides so an equal amount is applied
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What is force measured in?
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Newtons
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Newton
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The unit force is measured in
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What is the main unseen force on Earth?
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Gravity
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Net Force
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The combination of all forces acting on an object
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What does force have?
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A magnitude and direction
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How do you find out the net force when the forces are moving in the same direction?
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You add them
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How do you find the net force when the forces are moving in different directions?
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You subtract the smaller force from the bigger force
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What does the net force tell you?
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If the object is balanced or unbalanced
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What is the most common unseen force?
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Gravity
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Net Force
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The combination of all forces acting on an object
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How do you find the net force of an object that has force going the same direction?
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Add the forces
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How do you find the net force of an object that has forces going different directions?
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Subtract the forces
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When the net forcc of an object produces 0, what is it?
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Balanced
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What is the most common unseen force?
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Gravity
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Net Force
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The combination of all forces acting on an object
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How do you find the net force of an object that has force going the same direction?
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Add the forces
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How do you find the net force of an object that has forces going different directions?
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Subtract the forces
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When the net forcc of an object produces 0, what is it?
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Balanced
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What does net force tell you?
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Whether the object is balanced or unbalanced
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What will a balanced force not do?
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Change in motion of a moving object or make a nonmoving object move
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What do balanced usually have to do with?
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Gravity
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Unbalanced Force
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When the net force of an object is not 0N
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What will an unbalanced force do?
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Cause a moving object to change motion and move a nonmoving object
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What are unbalanced forces necessary for?
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To move an object
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Friction
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A force that stops two surfaces that are touching
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When does friction occur?
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When there is a rough surface
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What causes friction?
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To rough surfaces sticking together
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What does the amount of friction depend on?
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The amount of force pushing the surfaces together and the roughness of the surface
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Why is the rougher the surface is the greater amount of fricion it has?
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Because the surface has microscopic hills and mountains
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What are the 2 types of friction?
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Kinetic and Static
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What does kinetic mean?
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Moving
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Kinetic Friction
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Friction between moving surfaces
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What does kinetic friction depend on?
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How the surfaces move
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Surfaces can either _____ or _____ past eachother
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Slide or Roll
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Which force is greater, sliding or rolling?
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Sliding
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Why is sliding force greater than rolling force?
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Because it takes a bigger push/pull to slide an object then roll it
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Static Friction
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When force is applied to an object but doesnt make it move
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Why does static friction not move?
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Because the force of static friction balances the force applied
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What are 3 ways to reduce friction?
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Lubricants, switching from rolling to kinetic friction, and make surfaces smoother
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What are 2 ways to increase friction?
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Make the surfaces harder or increase the force puching the surfaces together
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