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### 43 Cards in this Set

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 What is motion? Motion is when a distance from another object changes How can an object be in motion and not in motion at the same time? Give example Point of view/ reference point EX: flying on an airplane What is the difference between speed and velocity? speed is how fast an object is going and velocity is speed in a given direction what is the formula for calculating speed/velocity s=d/t What is acceleration? acceleration is a rate in which velocity changes How could an object accelerate without changing speed? change in direction What are the three ways an object can accelerate? increase in velocity, decrease in velocity and change in direction What does the slope of a distance v time graph indicate about an objects motoin? it indicates velocity How do you determine if an object is giong faster or slower than another object? by if the slope is steep or flat What does the slope of a velocity v time graph indicate about an object's motion? slope indicates acceleration velocity v time graph: wat does it mean if the slope is upward? downward? flat? upward: increasing velocity---downward: slowing down---flat: constant velocity How could you tell if an object came to a complete stop? the line would be going downward how fast will an object be going if it accelerates at a rate of 5/m/s/s for 8 seoconds? .625m/s/s explain how Aristotle and Galileo would explain a pool ball slowly rolling to a stop? They say that it comes to its natural state of rest and that once an object is in motion, no force is needed to stay in motion What is Newton's first law of motion? an object at rest stays at rest and an object in motion stays in motion until acted on by an unbalanced force. what is force? any push or pull that causes an object to accelerate what are the units used to measure force? newtons or Kg*m/s2 what is balanced force? equal forces acting on an object in opposite directions: causes no change in motion what is the net force of a balanced force? 0 under what two condidtions can an object be experiencing a balanced force? static/mechanical equilibrium--at rest or at constant speed what is an unbalanced force? an unequal force that changes an object's motion what is the net force of an unbalanced object? the combination of all forces acting on an object what does an unbalanced force cause an object to do? change in motion why is it harder to get an object in motion then it is to keep it in motion? difference between balanced and unbalanced. Unbalanced takes more force then balanced What is Newton's Second Law of motion? force=mass x acceleration What is the relationship between force and acceleration? the relationship is that force causes acceleration what is the relationship between mass and acceleration the more mass there is in an object, the more its going to accelerate what is newton's third law of motion? for ever action there is an equal but opposite reaction what is friction? the force that one object exerts on another object when the two rub against each other what does friction cause? objects to slow down, resist motion, produces heat what two factors affect the frictional force between two objects? surface texture and pressure between surfaces what are the three types of friction--list from least to greatest rolling, fluid, and sliding friction what is gravity? a force that pulls objects towards the earth what is the rate of acceleration due to gravity? 9.81m/s/s2 or 10 If gravity pulls all objects at the same rate, what causes objects to fall at different rates? air resistance what is terminal velocity? the maximum belocity a falling object can achieve what causes terminal velocity? wat force is it? when force of air resistance=force of gravity object stops accelerating balanced force what is the difference between mass and weight? mass is the quantity in an object and weight is the gravitational force exerted on an object if you went to the moon what would happen to your mass? your weight? mass--increase weight--decrease why do three objects that are shot horizontally at different rates all hit the ground at the same time? --gravity is independent of horizontal velocity --if you shoot hte ball fasste enough it wil never fall back to earth --object stays in orbit descrive how the balance of gravity and inertia help keep a satellite inorbit around the earth? it helps keep it in orbit because inertia goes horizontally and gravity goes down. there is a curved line in the middle that keeps the earth orbitting. if you threw an object fast enough it would circle the earth. what would happen if the satellite lost velocity? if there was no gravity? lost velocity--it would go horizontally no gravity--fall straight down what two factors affect the amount of gravitational force between two objects? how? mass and distance more mass leads to more gravitational pull and the closer together more gravitational pull