Sit-up
Name 1 lubricant
oil, soap or water
This is what causes objects to fall back toward the center of the earth
gravity
True or False: A swimmer relies on exact body position to move through the water at greater speed
True
T or F: Shoes with smooth soles provide the best traction.
False
T or F: An adult skydiver falls fastest laying horizontally with belly facing downward.
False
a push or pull on something
force
Friction which slows an object as it moves forward through air or water
Drag
Substance which reduces friction
Lubricant
Force that holds back the movement of an object
friction
The sticking together of two different materials
Friction between two objects that keeps them from sliding across each other
Traction
When an object is shaped in a way that enables it to travel through the air or water much more easily, we call it
Aerodynamic
the property of matter that resists change in motion or state
Inertia
Name one force that resists motion
air resistance or inertia
The change in speed and in the direction something is going
acceleration
The sticking together of a material to itself
Cohesion
Finish the sentence.
For every action there's an ______ and______ reaction.
equal and opposite
David used this type of force when twirling the sling
centripetal force
Which law of motion keeps the earth and moon in place
The 2nd law of motion
the earth is way more massive than the moon, thus it has a greater pull on the moon
For every action there is an equal and opposite reaction
Newton's 3rd Law of Motion
This is a law that states objects that are closer to one another have a more powerful attraction
or
objects that are closer pull with more strength than objects that are further away
The law of universal gravitation
When forces on a falling object balance each other out, the object has reached _______ ________ and will not fall any faster.
terminal velocity
What formula do we use to demonstrate Newton's 2nd Law of Motion?
Force = Mass x Acceleration
An adult skydiver's terminal velocity is what speed?
122 miles per hour (will take a close estimate)
What 2 forces change the movement of objects in motion on earth? Name both.