IB Physics Circular Motion and Gravitation: Gravitational Force

This video tutorial covers the concept of gravitational force, focusing on Newton's law of gravitation. It explains the attractive force between masses, the application of Newton's third law, and the calculation of gravitational force using the law of gravitation. The tutorial also discusses point masses, provides sample calculation questions, and summarizes key points and common questions related to gravitational force.

What is the nature of the gravitational force between two objects with mass?

• Repulsive

• Attractive

• Neutral

• Variable

According to Newton's third law, what happens when the Earth exerts a gravitational force on a cow?

• The cow exerts a smaller force on the Earth

• The cow exerts an equal and opposite force on the Earth

• The cow exerts a larger force on the Earth

• The cow exerts no force on the Earth

In Newton's law of gravitation, what does the symbol 'G' represent?

• Distance between objects

• Gravitational force

• Gravitational constant

• Mass of the object

What is the key requirement for using Newton's law of gravitation accurately?

• Objects must be of equal mass

• Objects must be stationary

• Objects must be in motion

• Objects must be point masses

What is the relationship between gravitational force and the distance between two objects?

• Directly proportional to the square of the distance

• Inversely proportional to the distance

• Directly proportional to the distance

• Inversely proportional to the square of the distance

If the mass of one object is doubled, what happens to the gravitational force between two objects?

• It doubles

• It quadruples

• It remains the same

• It halves

What is a common mistake when calculating gravitational force using the formula?

• Forgetting to add the masses

• Forgetting to use the gravitational constant

• Forgetting to square the distance

• Forgetting to multiply the masses

In the sample question, what is the gravitational force between the Earth and a satellite of mass 100 kg?

• 500 newtons

• 200 newtons

• 951 newtons

• 1000 newtons

If a satellite moves to a distance 2R from a planet with half the mass of Mars, what happens to the gravitational force?

• It doubles

• It remains the same

• It reduces to 25 newtons

• It increases to 400 newtons

What is the gravitational force on a satellite due to planet X if it is half the mass of Mars and the distance is doubled?

• 200 newtons

• 25 newtons

• 100 newtons

• 50 newtons