A small rock is falling.

A car is driving down the road at a constant speed of 20 m/s

A potato plant is soaking up the sun's rays.

The system is the potato plant and the sun

A person is holding a sling shot up in the air and in the process of pulling the sling back. The sling is moving and holding a small ball.

Note: the system is the sling shot and ball.

The star Vega shines brightly and gives of energy of many wavelengths.

A picnic lunch is sitting on the ground.

At the Olympics, a shooter holds a rifle up off the ground to fire a bullet at a target. The gun is loaded with gunpowder, but has not been fired.

Note: The system is the gun and the bullet.

The bullet from the last question was fired and is now traveling through the air

Note: The system is the gun and the bullet.

A satellite is in stable orbit, circling the earth.

A person is running up a hill. They are halfway up the hill.