6th Grade Science  Chapter 2  Forces
Terms
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 The resistence of an object to a change in the speed or the direction of its motion.
 Inertia
 The amount of matter in an object.
 Mass
 Any change in motion of an object.
 Acceleration
 An object at rest will remain at rest and object in motion will remain in motion unless acted upon by an outside force.
 Netwon's 1st Law of Motion
 A push or a pull.
 Force
 A force that resists motion between two objects in contact
 Friction
 The force that resists motion between two objects in contact.
 Gravity
 What is the rate of acceleration of gravity?
 9.8 meters per second/2
 Forces that are equal in size but opposite in direction.
 Balance Forces
 Forces that cause a change in the motion of an object.
 Unbalanaced forces
 Anything that has mass and takes up space.
 Matter
 1 Netwon = 1 Kg mass X 1 Meter/sec2.
 Netwon

F = M x A
Force = Mass x Acceleration  Netwon's 2nd Law of Motion
 For every action there is an equal and opposite reaction.
 Netwon's 3rd Law of Motion
 How many grams in a Kilogram?
 1000
 What would happen to an object's acceleration if the forces applied to it increase?
 It accelerates
 Why is it difficult to run on ice?
 Less Friction
 How are acceleration, mass and inertia related?
 The more mass, therefore the more inertia, the harder it is to accelerate that mass.
 The force that pushes on something.
 Action force
 The force that pushes back.
 Reaction force
 The total of all the forces action on an object.
 Net force
 Any force that keeps an object moving in a circle.
 Centipetal force
 What is the formula for Acceleration?
 Acceleration = Force/Mass
 What is the formula for Mass?
 Mass = Force/Acceleration
 What is the change in position over time?
 Motion
 The resistance of an object to a change in speed or direction is called?
 Newton's First law of motion
 The change in velocity over time?
 Acceleration
 What is Momentum?

Momentum = Mass times Velocity or
P=MV  A collision is a situation in which two objects in close contact transfer?
 Energy and Momentum
 When you push on a door, the door pushes back with an equal and opposite force. These two forces are known as?
 Action / Reaction force pairs
 The momentum of an object is the product of its...?
 Mass and Velocity
 What is the unit of force?
 Newton
 What is the unit for mass?
 Kg
 What is the unit for acceleration?

m/s/s
Mass divided by seconds squared