AP Physics 1 Unit 5 - Circular Motion and Gravitation

Front

What is circular motion?

Back

Circular motion is the motion of an object that revolves around a fixed point in a circular path. It can be uniform (constant speed) or non-uniform (changing speed).

Front

What is centripetal force?

Back

Centripetal force is the net force that acts on an object moving in a circular path, directed towards the center of the circle. It is necessary for maintaining circular motion.

Front

What is the formula for centripetal acceleration?

Back

Centripetal acceleration (a_c) is given by the formula a_c = v²/r, where v is the tangential speed and r is the radius of the circular path.

Front

What is gravitational force?

Back

Gravitational force is the attractive force between two masses. It is described by Newton's law of universal gravitation: F = G(m₁m₂)/r², where G is the gravitational constant.

Front

What is the role of gravity in planetary motion?

Back

Gravity is the force that keeps planets in orbit around the Sun, providing the necessary centripetal force for their circular motion.

Front

What happens to an object in motion when the force acting on it is removed?

Back

An object in motion will continue in a straight line at constant speed due to inertia, as described by Newton's first law of motion.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, measured in kilograms, while weight is the force exerted by gravity on that mass, measured in newtons (W = mg).

Front

What is the concept of inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion. It is directly related to the mass of the object.

Front

How does distance affect gravitational force?

Back

Gravitational force decreases with the square of the distance between two masses. As distance increases, the gravitational force becomes weaker.

Front

What is the significance of the term 'orbital radius'?

Back

Orbital radius is the distance from the center of the mass being orbited to the object in orbit. It influences the gravitational force and the speed of the orbiting object.