Chapter 3- Forces and Motion

_____________ is a change in the position of

an object.

Motion

The force that pulls all objects toward each

other is ______________.gravity

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

reference point

____________ is the rate at which an object changes position.

Speed

Any push or pull is a ____________.force

____________ is the speed and the direction an object is moving.

Velocity

Objects move in _____________________, _____________________, or ____________________.

straight linesin curved paths

back and forth

The mass of an object affects the _________ needed to change its motion.

force

The force of __________ pulls objects to Earth.

gravity

_______________ is the change in speed or direction of an object.

Acceleration