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Energy How the energy of an object relates to its: ● Speed (Week 1) How energy can be transferred through: ● Sound (Week 2) ● Light (Week 3) ● Heat (Week 4) ● Electrical currents (Week 5) Speed Week 1 Energy and Speed ● ENERGY: the strength and vitality required for sustained physical activity ● SPEED: the rate at which an object moves All energy can be divided into two groups: potential energy and kinetic energy. What is Potential Energy? ● Potential Energy - energy caused by an object’s position or shape ● This is energy that is stored and is waiting to be used up later. What is Kinetic Energy? ● Kinetic Energy - the energy of motion; depends on speed and mass ● This is active energy and object has due to its motion. Acceleration and Velocity ● Acceleration:the rate at which velocity (speed) changes ● Velocity: an object’s speed in a specific direction How can we change the velocity of an object? We can... ● Change the Slope: the steepness, incline, or grade of a straight line ● Use Force: A push or pull that causes an object to move, stop, or change direction Force and Work ● A force can do work when acting on a body or object. ● Work: when a force causes an object to react in the direction of the force Friction ● Friction affects velocity and acceleration. ● Friction: a force that acts against or stops motion when an object rubs against another object Inertia ● All objects have inertia. ● Inertia: the tendency of an object to remain unchanged until that state is changed by an external force