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The definition of gravitational field strength is:

• The region of space surrounding a body where other bodies will feel an attractive force due to it.
• The region of space surrounding a body where other bodies will feel an repulsive force due to it.
• The region of space surrounding a charge where other charges will feel an attractive force due to it.
• The region of space surrounding a charge where other charges will feel an repulsive force due to it.

How far out from a mass should the gravitational field lines go....

• to where the gravitational field becomes negligable
• to twice the diameter of the mass
• infinitely far
• to four times the diameter of the mass

Gravitational potential at a point is....

• the work done in bringing a unit mass from infinity to the point
• the work done in bringing a unit mass from the point to infinity
• the work done in bringing a unit charge from infinity to the point
• the work done in bringing a unit mass from twice the radius of the mass to the point

What is numerically equal to the gravitational field strength at a point P on the Earth's surface?

• the acceleration of free fall at P.

• the change in potential energy per unit distance from P.

• the force acting on any body placed at P.

• the work done in bringing unit mass from infinity to P.

Which statement about a uniform gravitational field is true?

• Its magnitude is the same in all directions.

• The gravitational potential has the same value at all points within it.

• Its direction is opposite to the direction of motion of a test mass released in it.

• Its field strength is the same at all points within it.

An object is moved from A to B in the gravitational field of Earth. The distance between the centre of Earth and B is twice that of A. If the gravitational potential energy of the object at A is –2.0 MJ, what is the gravitational potential energy of the object at B?

• zero
• -0.5MJ
• -1.0MJ
• -4.0MJ

Gravitational field strength is measured in:

• N
• J/kg
• m/s
• N/kg

The gravitational potential energy is zero at

• just above the surface

• the surface

• infinity

• just before infinity

Which equation represents general gravitational potential energy?

• E_g = GMm/r²

• E_g = -GMm/r²_

• E_g = GMm/r_

• E_g = -GMm/r_

As the distance between an object and Earth increases,

• the gravitational constant G increases

• the gravitational constant G decreases

• the gravitational potential energy relative to Earth approaches infinity

• the gravitational potential energy relative to Earth approaches zero