Apparent Weightlessness Introduction

The video tutorial explores the concept of gravity, starting with the equation for gravitational force on Earth. It discusses conditions for zero gravity, derives the acceleration due to gravity, and explains weightlessness in space. The tutorial calculates gravity on the International Space Station, clarifying why astronauts appear weightless. It introduces the concept of apparent weightlessness, using examples like a falling bucket of water and free-falling elevators to illustrate the phenomenon.

What is the equation for the gravitational force acting on an object on Earth?

• Force of gravity equals mass divided by acceleration due to gravity

• Force of gravity equals velocity times acceleration due to gravity

• Force of gravity equals mass times acceleration due to gravity

• Force of gravity equals mass times velocity

What condition must be met for the gravitational force on an object to be zero?

• The object must have zero mass

• The object must be at rest

• The object must be moving at a constant speed

• The acceleration due to gravity must be zero

How is the acceleration due to gravity derived?

• By dividing the mass of the Earth by the universal gravitational constant

• By multiplying the universal gravitational constant by the mass of the Earth and dividing by the square of the distance between the centers of mass

• By subtracting the mass of the object from the mass of the Earth

• By adding the mass of the object to the mass of the Earth

What is the average acceleration due to gravity on the International Space Station?

• 9.8 meters per second squared

• 8.6 meters per second squared

• 0 meters per second squared

• 7.5 meters per second squared

Why do astronauts appear to float in the International Space Station?

• Because they are weightless

• Because the station is moving upwards

• Because there is no gravity in space

• Because they are in a state of free fall along with the station

What keeps the International Space Station in orbit around the Earth?

• The absence of air resistance

• Centripetal acceleration and inertia

• The station's engines

• The gravitational pull of the Moon

What happens to water in a bucket when it is in free fall?

• The water stops flowing out of the bucket

• The water flows out of the bucket

• The water remains at the bottom of the bucket

• The water evaporates