Matter doesn't have to have mass, as long as it takes up space.
a. true
b. false

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

The softest and hardest minerals are: softest hardest