Motion and Energy

When an object's distance is changing from another object is changing it is

• in motion

• moving at a a constant speed

• traveling at a high velocity

• accelerating

A place or object used to determine if an object is in motion is called a

• position

• reference point

• constant

• velocity

When you know both the speed and direction of an objects motion you know the

• speed

• acceleration

• distance

• velocity

If you know the distance an object has traveled in a certain amount of time you know its

• speed

• acceleration

• energy

• power

If a cyclist travels 30km in two hours, her speed is

• 30 km/hr

• 60 km/hr

• 15 km/hr

• 2 km/hr

If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?

• The object's speed changed

• The object's velocity did not change

• The object accelerated

• The object decelerated.

The rate at which velocity changes is called

• instantaneous speed

• direction

• acceleration

• motion

Which of these is an example of deceleration, or a negative acceleration?

• a bird taking off

• a roller coaster rolling down a hill

• a car slowing down as it approaches a red light

• an airplane flying in a straight line

Changing direction is an example of a kind of

• acceleration

• speed

• velocity

• constant rate

The moon accelerates because it is

• in the vacuum of space

• continuously changing direction

• a very large sphere

• constantly increasing its speed