Physics U3: Circular Motion, Gravity, Static Electricity

Front

What causes astronauts in orbit to appear weightless?

Back

They are falling due to the gravitational pull of the Earth, creating a state of free fall.

Front

Which particle is responsible for static electricity by moving between objects?

Back

Electrons move from one object to another during the charging process.

Front

How does electric field intensity change with distance from a point charge?

Back

It decreases as the square of the distance from the charge.

Front

What happens to the gravitational force between two objects as they move farther apart?

Back

The gravitational force decreases.

Front

If the mass of the Earth doubles, how does it affect the force of gravity on an object at its surface?

Back

The force of gravity would also double.

Front

Define circular motion.

Back

Circular motion is the motion of an object that revolves around a fixed point in a circular path.

Front

What is the formula for gravitational force between two masses?

Back

F = G * (m1 * m2) / r^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between their centers.

Front

What is the relationship between centripetal force and circular motion?

Back

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

Front

Explain the concept of weightlessness in orbit.

Back

Weightlessness occurs because both the astronaut and the spacecraft are in free fall towards Earth, creating a sensation of no weight.

Front

What is the significance of the inverse square law in gravity?

Back

The gravitational force decreases with the square of the distance, meaning that as distance increases, the force decreases rapidly.