Central Forces

What is the effect of a central force on a satellite’s motion?

• It causes the satellite to spiral inward

• It causes the satellite to accelerate away

• It has no effect on the satellite’s motion

• It maintains the satellite in a stable orbit

Which of the following is an example of a conservative force?

• Gravitational force

• Tension force

• Frictional force

• Normal force

From Kepler’s law of orbit, we can infer that the sun is located _____ of the planet’s orbit.

• at the centre
  

• at both foci
  

• at one of the foci
  

• anywhere along the semi-minor axis

Kepler’s laws of planetary motion replaced circular orbits with _____

• hyperbolic orbits

• conical orbits
  

• elliptical orbits
  

• parabolic orbits
  

What does Kepler’s law of period relate?

• Time period and semi-minor axis
  

• Time period and semi-major axis
  

• Time period and area swept by the planet

• Time period and eccentricity
  

The torque acting on the particle is always

• one

• zero

• infinite

• Undefined

• True

• False

The relation between Force and Potential energy is __________

The areal velocity in planetary motion depends on the

• Time period

• Semi major axis

• energy

• None of the above

Equation of motion under a central force is