Energy
Explain the difference between kinetic energy and gravitational potential energy.
Gravitational potential energy is based on position while Kinetic energy is based on velocity.
What is the difference between speed and velocity?
Speed is a scalar while Velocity is a vector.
An astronaut in outer space shoots a tennis ball with an initial velocity of 20 m/s. What would happen?
It will go on forever until it hits something.
In a position versus time graph, what is the area under the curve equal to?
Velocity
What is the multiplicative factor of Mega?
1,000,000
Explain the difference between GRAVITATIONAL potential energy and SPRING potential energy.
Gravitational potential energy is based on position while Spring potential energy is based on springs.
How do you calculate the speed of an object if you know the distance and time?
Divide distance over time.
If an spring has a spring constant of 6 and an extension of 5 meters, what is the spring force acting on the object?
30 N
Can a graph ever be straight veritcal?
No.
True or False: When I measure my position, I measure how far away I am from my reference point.
True
State the law of conservation of energy.
In a closed system, energy cannot be created or destroyed, only transferred.
Explain Newton's First Law of Motion (inertia) and give an everyday example.
An object will remain in motion or at rest unless acted upon by an unbalanced force.
i.e: a couch not just rolling away when no one touches it.
I push a moving box across the floor. It is easier to push on an ice skating rink than on the carpeted floor. Why is this?
There is less friction between the ice and the box than between the carpet and the box.
What are the units for the area under the curve for any graph?
Horizontal axis * Vertical axis
What are the different forms of energy?
Kinetic, potential
How does the speed of an object affect its kinetic energy?
It is contributes the most to kinetic enrgy.
Is hammer hits nail, nail hits wood with an equal and opposite force a Newton's Third Law action-reaction pair?
No.
If I go from Earth (g= 9.8 m/s2) to the Moon (g=1.6 m/s2) and I weigh 355 N on Earth, what is my weight on THE MOON!
22 N
If an object is accelerating to the right, what would the position versus time graph look like for that object?
Curved up
A greyhound starts at rest and accelerates to 60 m/s in 10 seconds. What was the acceleration of the bus?
6 m/s2
What factors determine an object's gravitational potential energy?
Mass and height.
How does the slope of a distance-time graph represent an object's velocity?
The slope is equal to the velocity.
What is the cause of friction?
Atoms are effectively round, and bump against each other.
I am standing on a table. If I jump down and cause a million earthquakes across both the known and unknown universes, what would a graph for my velocity look like?
If I cause that many earthquakes, that means I was going pretty fast, so you would see a spike in my velocity, and when I hit the ground, my velocity would go all the way back to zero very fast.
Rhiss Lerre gets in his car and drives down the road at 35 miles per hour. He sees a police car and slows down to the legal speed limit of 25 miles per hour in two seconds. The police officer pulls him over and gives him a ticket, but more importantly, what was his acceleration?
5 m/s2