Forces
Does applying a force always result in a change in motion? Explain.
No, sometimes the force is not great enough to produce a change in motion
What do unbalanced forces result in?
A change in motion
Who came up with the written idea of gravity?
What is a force?
A push or pull on an object
What is Gravity?
An attractive force between any two objects that depends on the masses of the objects and the distance between them
What are the two general way forces can be described?
Balanced and Unbalanced
What do balanced forces result in?
No change in motion
Why do wheels work?
Rolling Friction.
What is a Net Force?
The sum of all of the forces acting on an object
What is weight?
The gravitational force exerted on an object.
What is static friction?
When a force is being applied but there is no change in motion
How does sliding friction occur?
When a force is applied that causes a change in motion in the opposite direction of friction.
What are the three types of friction?
Static, Sliding, and Rolling
What is Air Resistance?
A friction like force that opposes the motion of objects that move through the air.
What is Friction?
Forces that opposes the sliding motion of two surface that are touching each other.
What has a greater impact on the effect of gravity, Mass or Distance? How do we know?
Distance. The earth has a stronger gravitational pull on you then the sun even though the sun is much more massive than the earth.
What is the Range of Gravity?
Infinite
The gravity formula will never result in a calculation of zero so even though the force of gravity may become very weak, to the point where gravity is not noticeable, the pull of gravity never goes away.
Why do people who are stuck in mud, snow, or ice often times put down sand, gravel or kitty liter?
To increase friction so their tires can work.
What is a field?
A region of space that has a physical quantity (such as a force) at every point
What is Terminal Velocity?
The maximum speed an object will reach when falling through a substance, such as air.
The force of gravity on earth is 9.8N/Kg. On Mars the Force of gravity on mars is 3.7N/kg. Which planet will you be able to jump higher on?
Mars since the gravity is not as strong
How did we discover Neptune?
Neptune was found because of the gravity formula. Astronomers knew that something was throwing off the gravity of Uranus, eventually when better telescopes came along, Neptune was identified.
What are the four fundamental forces?
(This question will likely not be on the test)
Gravity, Electromagnetic, Weak Nuclear, Strong Nuclear
What is Free Fall?
When gravity is the only force acting on an object?
What is the Law of Conservation of Momentum?
If no external forces act on a group of objects, their total momentum does not change.