IS_Section Quiz_11.6_e

A spacecraft travelling in space is in frictionless motion.

• True

• False

Micro-gravity refers to the condition in which the force of gravity is equal to zero.

• True

• False

Astronauts float around in space because of micro-gravity.

• True

• False

A spacecraft enters the atmosphere at a very high speed in its return journey to the Earth.

• True

• False

The outer surfaces of spacecrafts are often made of materials that have a high thermal conductivity.

• True

• False

Micro-gravity is the condition in which people or objects appear to be weightless.

• True

• False

The larger the mass of a rocket, the greater is the force of gravity acting on the rocket by the Earth.

• True

• False

A rocket can push itself upwards by ejecting gases upwards.

• True

• False

Water is commonly used as rocket fuel.

• True

• False

Spacecrafts need to designed in streamlined shape in order to reduce air resistance in space.

• True

• False