a push or pull

something that is exerted

a change in velocity over change in time

gravity or friction

a 10 kg box of books has inertia

a car travels at a constant velocity of 10 m/s

a car in motion will tend to stay in motion, while a car at rest will tend to stay at rest

friction pushes against an object, slowing it down

the tree was already in motion and changed direction

the tree had momentum

the tree was already in motion and sped up

the tree was stationary and began to move

At 0 s, a snake slithers forward with a velocity of 2 m/s. 5 s later the snake's velocity is 2 m/s.

An eagle remains flying at a constant velocity.

A sparrow remains stationary perched on a power line.

A running tiger increases its speed from 4 m/s to 6 m/s.

The net force on an object will equal the mass of the object multiplied by its velocity.

Any one force that acts on an object will equal the mass of the object multiplied by its acceleration.

Any one force that acts on an object will equal the mass of the object multiplied by its velocity.

The net force on an object will equal the mass of the object multiplied by its acceleration.

There are only forces parallel to the direction of motion.

There is no net force on the object.

There are no forces on the object.

There are no forces parallel to the direction of motion.

There is a net force on the object to the left.

There is a net force on the object upwards.

There is a net force on the object to the right.

There is a net force on the object downwards.