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# Sciencexams

### Finals

What is the difference between speed and velocity? Velocity includes direction, while speed does not.
What are the definitions of net force, balanced force, and unbalanced force? Net force = two or more forces acting on an object at the same time A balanced force = two forces that cancel each other out Unbalanced force = two forces are acting on an object in opposite directions with unequal force
What are Newton's three laws and what do they mean? 1) An object will remain at its constant velocity unless acted upon by an outside force 2)F = MA 3)For every action, there is an equal and opposite reaction
What are the equations of speed and velocity? Speed = distance/time Velocity = speed + direction
What is the equation for acceleration? Be able to use it in a word problem. Acceleration = Final v- initial v divided by time A car goes around the track going 80mph N In 5 sec. it speeds up to 95mph and turns E. What is its acceleration? (3miles/hour east)
What is friction and how does it affect objects? Friction is a force that opposes motion between two surfaces that are in contact. It exerts force on both objects either moving or stationery, providing a net force which slows down the object.
What is the difference between weight and mass? Would you weigh more on Saturn or Earth? Mass = the amount of matter that makes up an object Weight = the measure of the gravitational force exerted on an object Saturn's gravitational force is larger, so you would weigh more over there.
What does the Law of Conservation State? How is it related to roller coasters? The Law of Conservation states that energy cannot be created or destroyed. In a roller coaster, the energy of the cars going downhill is transferred to heat from friction between the track and the cars.
KE = 1/2 x 4kg x 3m/s squared KE = 18J
Work = f x d W = 55N x 4m W = 220J
What are the three kinds of heat? Give an example of each. Conduction (roasting a marshmellow), Convection (magma in Earth's asthenosphere), and Radiation (sunshine)
Created by: Zyna