Forces

________ is a measure of the amount of matter in an object.

Mass

All objects, moving or not, ________ in motion.

resist changes

________ to change in motion is called inertia.

Resistance

________ is measured in kilograms times meters per second per second.

Force

The unit for momentum is ________ per second.

kilograms times meters

________ is a force that pulls objects toward each other.

Gravity

________ is measured in meters per second per second.

Acceleration

________ in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it.

Satellites

________ describes both the speed and direction of an object.

Velocity

An object moving at a(n) ________ will continue moving at a(n) ________ unless acted upon a non- zero net force.

constant velocity

________ is a characteristic of a moving object that is related to the mass and the velocity of the object.

Momentum

________ states than an object at rest will remain at rest unless acted upon by a non- zero net force.

Newtons first law of motion

________ is a measure of the force of gravity on an object.

Weight

If an object falls for long enough, increased ________ will reduce its acceleration to zero.

air friction

When something falls on earth, there is ________ from the air around it.

fluid friction

________ is motion where the acceleration is caused by gravity.

Free fall

________ is a force that causes an object to move in a circular path.

Centripetal force

________ when surfaces push harder against each other.

Friction increases

A(n) ________ causes a change in the objects motion.

non zero net force

________ do not need fuel due to its inertia continuing its movement.

Satellites

________ is the rate at which velocity changes.

Acceleration

________ always point toward the center of the circle an object is moving in.

Centripetal forces

________ acts everywhere in the universe, not just Earth.

Gravity

________ refers to increasing speed, decreasing speed, or change in direction.

Acceleration

the longer the arrow, the greater the force

The length of the arrow tells you the strength of the force

mass and distance

Two factors that affect the gravitational attraction between objects