Gravity

Define the term 'gravity'.

• gravity

• friction

• magnetism

• inertia

Define the term 'projectile'.

• projectile

• a type of vehicle

• a musical instrument

• a type of plant

Define the term 'velocity'.

• velocity

• speed

• acceleration

• momentum

Define the term 'acceleration'.

• acceleration

• velocity

• speed

• momentum

Define the term 'force field'.

• force field

• magnetic field

• gravitational field

• electric field

Objects that are on or near Earth’s surface are attracted to Earth by _____________. An object that moves through the air with only gravity acting on it is called a _________________.

• gravity; projectile

• magnetism; satellite

• friction; glider

• electricity; drone

When a projectile, like a fireball, is thrown upward and forward, what can be said about its velocity? Part B: The fireball ________________ when moving __________. It ________ ______ when moving ____________. So, its velocity is always ___________.

• The fireball increases in speed when moving upward. It decreases in speed when moving downward. So, its velocity is always changing.

• The fireball decreases in speed when moving upward. It increases in speed when moving downward. So, its velocity is always constant.

• The fireball maintains its speed when moving upward and downward. So, its velocity is always constant.

• The fireball increases in speed when moving upward and downward. So, its velocity is always increasing.

The change in the fireball’s velocity was caused by ________ ____________.

• unknown forces

• gravity

• wind

• friction

For any projectile, the rate of acceleration is ________________. The value of this acceleration on Earth is _______ m/s². In other words, a falling object’s velocity increases every second by _______ meters per second. This acceleration is called the _______________ _______ ___________ (g).

• acceleration due to gravity, 9.81, 9.81, acceleration due to gravity

• constant, 10, 10, uniform acceleration

• variable, 9.8, 9.8, gravitational force

• zero, 0, 0, zero acceleration

Acceleration due to gravity does depend on an object’s mass.

• does

• doesn’t