Topic Quiz on Gravity Fields

Which one of these statements is true about gravity?
1. It can be an attractive or repulsive force.
2. It is a strong force.
3. It is only ever attractive.
4. It is only a property of very large objects.
The gravity field around a planet is:
1. Radial with the direction pointing inwards
2. Linear
3. Like a bar magnet
4. Radial with the direction pointing outwards.
The strength of a gravity field is
1. directly proportional to the distance.
2. inversely proportional to the distance
3. directly proportional to the square of the distance
4. inversely proportional to the square of the distance.
Gravitational field strength is defined as
1. mass per unit force
2. energy per unit force
3. force per unit mass
4. acceleration per unit mass
Gravitational field strength is measured in N/kg. It can also be meansured in:
1. N/m
2. N/J
3. m/s
4. m/s^2
When working out the distance from a planet in gravity calculations, we need to measure the distance from:
1. the centre of the planet
2. the surface of the planet
3. the edge of any atmosphere of the planet.
4. the neutral point between a planet and its satellites.
Gravitational potential is defined as
1. the mass per unit energy done in moving the object from infinity to a point.
2. the work per unit mass done in moving the object from the centre of the planet to a point.
3. the work per unit mass done in moving the object from infinity to a point.
4. the work per unit mass done in moving the object from the surface of a planet to a point.
If we plot a graph of gravitational field strength against distance, the potential is given by:
1. the gradient
2. the area under the graph
3. the intercept
4. the values on the vertical axis added together.
If we plot gravitational potential against distance, the gradient gives us
1. the total energy
2. the total force
3. the force per unit mass
4. the acceleration per unit mass
Which one of these statements is correct about gravitational potential energy a long distance from the planet?
1. It can be worked out using potential energy = mass x acceleration due to gravity x height.
2. It is measured in J/kg
3. It doesn't exist, because we are too far from the surface of the planet.
4. It is given by energy = -(GMm)/r