Motion 2

Another name for Newton's first law of motion is the law of ________.

• inertia

• force

• equal reaction

• opposites

An object slowing down has a ________________ acceleration.

• positive

• negative

• neutral

• constant speed

The velocity of an object must have both a ____ and ____.

• speed and force

• direction and inertia

• speed and direction

• velocity and instantaneous speed

The equation s=d/t us used to calculate the ____ of an object.

• constant speed

• direction

• speed

• time

In the equation s = d/t d stands for

• direction

• distance

• speed

• time

In the equation used to calculate acceleration, v_i stands for _________and v_f stands for __________.

• initial velocity/final velocity

• final velocity/initial velocity

A car approaching a red traffic light has a ______ acceleration; when the light turns green, the car's acceleration is _________________.

• negative/positive

• Constant speed/instantaneous

• unbalanced/balanced

If the acceleration of a skateboarder is _____, the skateboarder may be soon coming to a stop.

• positive

• constant

• negative

• final

A net _____ is necessary for an object to change its motion.

• unbalanced force

• balanced force

• inertia

A freight train has more ______ than a car, so it has greater inertia.

• force

• mass

• speed