Motion and Speed
What equation do we use to calculate speed?
Speed=Distance/Time
What are the units used to measure force?
Newtons (N)
This type of energy depends on height.
Potential Energy
What is considered the attractive force? Explain what this force does.
Gravity is considered the attractive force. It pulls objects to together.
What moon phase occurs during a solar eclipse? Explain why.
A new moon occurs during a solar eclipse because the moon blocks the Sun's rays from reaching Earth for a brief period of time.
What variables affect the speed of an object?
Distance and Time
What is a force?
A force is a push or pull on an object.
What units do we use to measure the amount of energy in an object? Mention the abbreviation.
Joules (J)
What is the sprawling space systems made up of dust, gas, and countless stars that are attracted together as one large system. Some may contain 100 billion stars; others with less than a billion stars are considered
A galaxy
What is the density of water?
1g/mL
How can we tell if an object is in motion?
Based on it's distance from a reference point.
8N to the left, and 4 N to the right. Find the net force and then determine if this force is balanced or unbalanced.
4 N to the left
We use this equation to calculate PE.
PE=mgh or PE=wg
What is the difference between rotation and revolution?
We use this equation to to calculate density
D=M/V
On a Distance vs. Time graph what does a horizontal line mean?
A horizontal line means no motion.
What is Newton's Second Law?
If the net force increases, as mass remains constant, the acceleration will increase.
If the mass increases, as the net force remains constant, the acceleration will decrease.
.
Explain the Law of Conservation of Energy
The Law of Conservation of Energy can be used to explain why the amount of energy in an object is never created or destroyed, but transferred from one form to another.
What factors affect the force of gravity? Explain their relationship to gravity.
Distance and Mass.
As distance increases gravity decreases.
As mass increases gravity increases.
150g. This object is a liquid.
A car with a mass of 100 kg is stopped on the side of the road after getting a flat tire. The two people that were riding in the car get out and begin to push the car from rest to a nearby gas station. The car travels 50 meters in 40 seconds.
1.25m/s
The force pairs in Newton’s Third Law are responsible for many types of motion in the real world. Why? (Explain why by discussing what N3L states)
Objects are able to move according to N3L because the forces are equal, but are in opposite directions.
How much kinetic energy does a 10kg toy car have when moving at 3m/s (v2=9)
45 Joules
If we have a mass of 300g on Earth what would our mass be on Jupiter?
Our mass would be 300g. Mass doesn't change.
Which layer of the Earth is the least dense? Explain how you know.
The crust. It's the outer layer of the Earth because it's floating above the other layers.