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Transcript

Kinematics, Momentum and Energy BU Photon Outreach December 14, 2010 Newton’s First Law Inertia An object at rest will stay at rest and an object in motion will stay in motion unless acted on by an external force. Newton’s Second Law Force = mass x acceleration When a force is applied to an object, it will be accelerated. Newton’s Third Law Conservation of Energy For every action, there is an equal and opposite reaction. Energy Types: Electrical, Mechanical, Chemical, Thermal Potential: energy that a system has STORED Kinetic: energy you have when you are MOVING Sources of energy: Solar Nuclear Fusion Fossil fuels Hydropower Linear Momentum Is mass times velocity Conserved unless there is an outside force Torque A force that causes an object to twist or rotate Τ = (Applied Force) X (Distance) Center of Mass The center of mass is a point that acts as if all the mass was centered there Key Bar Angular Momentum Rotational momentum Conserved when there are no external torque Ex. figure skater Projectile Motion The path that an object takes when given an initial speed and the only force present is gravity Monkey and Hunter Problem Will the hunter hit the monkey?