Unit 3 AOS 1: How do things move without contact

“Fields and Interactions” & “Effects of Fields” Gravitational Fields: Region in space where a mass experiences a force due to another mass (monopole) Newton’s Law of universal gravitation (force that attracts two bodies of mass): F_g = G (m_1 m_2) / r^2 Gravitational Field Strength: g = GM / r^2 = F_g / m Gravitational Potential: E_g = mg∆h Change in E_g = W = Fs Force – Distance Graph: (watch for + -) Area = Work done = ∆ Energy …

Unit 3 AOS 2: How are fields used to move electrical energy?

“Generating Electricity” Magnetic field strength is often referred to as flux density Electromagnetic Induction: The generation of electricity in a conductor is due to the changes in a magnetic field EMF is only induced when there is relative motion between a conductor and magnetic field Magnetic Flux: a measurement of the total magnetic field which passes through a given area. ∅ = B⊥A Factors affecting the rate of change of flux: speed of magnet and field, strength of field, changing the area of the loop, angle between loop and field. Induced EMF in moving conductor: EMF is generated if wire “CUTS” field lines ϵ = lvB Factors affecting induced EMF: change in magnetic field, change in area ⊥ to magnetic field, faster the change in flux the greater the induced EMF. …