Physics term 1

• A force acting perpendicular to an object's surface causes it to accelerate, while a force parallel to its surface does not cause any change in velocity or direction.
• On an inclined plane, what is the normal force equal to?

  The normal force is equivalent to the y component of mg
• What does the x component of mg represent?

  The x component represents the horizontal force or the acceleration (if any)
• If there are no other forces present besides gravity, then the net force will be zero and the body will remain at rest or move with constant speed along the incline.
• What is the formula for range?

  x=ut
• When something is projected up, what force is acting on it?

  Gravity
• What does uniform velocity mean?

  No acceleration and constant speed
• what direction is acceleration in circular motion?

  Inwards/the same direction as force
• What is kepler's first law

  Planets move around the sun in an elliptical orbit, where the sun is one of the foci
• What is Kepler's second law?

  Where areal velocity is constant but the planet does not move at a constant speed
• What is the aphelion?


  The point furthest from the sun
• What is the perhelion?


  The point closest to the sun
• What is kepler's third law?

  The square of the period of the planet's orbit is proportional to the cube of the radius
• What is the difference between gravitational potential and potential energy?


  Potential is the work that would be done per unit mass to bring an object to infinity where the potential energy is the energy gained by an object from its position in a field
• What is electric potential?

  It is energy stored in an electric field
• In magnetic fields, which way do the field lines go?

  Out of north and into south
• When two current-carrying wires are close to each other what happens?

  If their fields are in opposite directions, they will repel and if their fields are in the same direction they will attract
• What force does a wire feel if its current is parallel to a magnetic field?

  It will experience NO force
• When a charge particle is stationany, will if experience a force due to a electric field?

  Yes
• What does a charged particle which is stationary NOT experiencea force from?

  A constant magnetic field
• What equation is the magnetic field in a solenoid?

  B=permability x turns per m x current
• What is the equation for a current carrying wire

  B= (permability x current)/ 2pi x distance
• What is the current in a loop of wire?

  B= (permability x current)/ 2 x distance
• Is charge conserved?


  Yes
• With electric potential, what work can the field do?

  The field can do work ON a particle but a particel can do work on the field
• What is magnetic flux?

  It is the amount of field lines in a certain area
• How does flux cause current in a wire?

  Flux only causes current in a wire when it is changing. For example, when you move a magnet towards or away from a wire, this is a change in flux
• What is electromagnetic induction?

  It is where the change in flux lines can induce a voltage in a wire
• What factors affect EMF?

  • Magnetic field strength
• When is torque is minium, what is flux?

  Flux is at its maximum when the coil is perpendicular to the magnetic field
• When flux is minimum, what is torque?

  Torque is at its maximum when the coil is parallel to the field