It’s time to make the ice pieces. For ice piece 1, place 2 teaspoons of water into one of the spaces in the ice cube tray. To make ice piece 2, place 2 teaspoons of water into the sealable plastic bag. Carefully squeeze as much of the air out of the bag as possible without spilling any water. Then seal the bag. Place the sealed bag on a flat surface in the freezer. Place the ice cube tray in the freezer at the same time. Leave both in the freezer for four hours. Record the start time and the time when you can remove the ice.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

a sonic boom is a loud boom that breaks the sound barrier

explanation:

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