2.5 TEST

Frames of reference are coordinate systems that help describe:

• object´s motion

• the force

• the power

• the newton´s Law

One kind of reference frame is inertial, and Newton's ______ law of motion applies.

• First

• Second

• Third

• Fifth

The law of Universal gravitation shows that the gravitational force between objects depends directly on their

• Masses

• Weight

• Volume

• Density

For a given distance, objects with higher mass have a higher gravitational attraction.

• True

• False

The gravitational force depends ______________ on the square of the distances separating the objects

• inversely

• directly

• proportional

For given masses, those closer together have a Lower gravitational attraction.

• False

• True

A frame of reference provides a system of coordinates. These coordinates identify an object's location.

• True

• False

Physicists distinguish between two types of frames of reference:

• inertial and non-inertial.

• imaginary and real

• inertial and Universal

• inertial and complex

Acceleration is a change in

• velocity

• position

• motion

• mass

Velocity actually includes two things,

• a speed and a direction

• a speed and inertia

• the frame of reference and direction