D1,D2,D3: Fields Gravitational, electrostatic and magnetic fields Physics IBDP, A levels

Students should understand:
Students should understand:
• Kepler’s three laws of orbital motion
•Newton’s universal law of gravitation for bodies treated as point masses
• conditions under which extended bodies can be treated as point masses
• that gravitational field strength g at a point is the force per unit mass experienced by a small point mass at that point
• gravitational field lines.
Students should understand:
• that the gravitational potential energy Ep of a system is the work done to assemble the system from
infinite separation of the components of the system
•the gravitational potential energy for a two-body system
• that the gravitational potential Vg at a point is the work done per unit mass in bringing a mass from infinity to that point as given by Vg = –GM/r
• the motion of a charged particle in a uniform electric field
Students should understand:
• the direction of forces between the two types of electric charge
•Coulomb’s law as given by F = kq1q2/r2
for charged bodies treated as point charges where k =1/4πε0
• the conservation of electric charge
• Millikan’s experiment as evidence for quantization of electric charge
• that the electric charge can be transferred between bodies using friction, electrostatic induction and by contact, including the role of grounding (earthing)
•the electric field strength as given by E =F/q
• electric field lines
• the relationship between field line density and field strength
•the uniform electric field strength between parallel plates as given by E =V/
the motion of a charged particle in a uniform magnetic field• the motion of a charged particle in perpendicularly orientated uniform electric and magnetic fields
• the magnitude and direction of the force on a charge moving in a magnetic field as given by F = qvB sin θ
• the magnitude and direction of the force on a current-carrying conductor in a magnetic field as given
by F = BΙL sin θ