FRAME OF REFERENCE
Can 2 observers describe the motion of an object differently?
What is one dimensional motion?
Is it preferred to have a collision for a ong period of time or short period of time?
Potential
What is the definition of Frame of Reference?
A specific view point used to describe motion.
What is Newton's Second Law of Motion?
Force equals mass times acceleration.
What is the formula for Impulse?
Force x Change in Time.
What are the 2 general types of energy we talked about?
Kinetic and Potential energy.
You are riding a bike and a car passes you on the street going in the same direction. What would the speed of the car look like to you on your bike compared to a person standing on the side of the road?
Why does a passenger lean forward when braking in a car? Identify the law of motion this is an example of.
What is the perfectly inelastic collision?
When two objects collide and stay together.
True or False
Energy can never be lost?
False, it can be lost in an open system with an external force.
A passenger in a moving train throws a ball straight up, how would you describe the motion as...
1. The passengers frame of reference.
2. an observer on the ground
1. The ball moves up/vertical.
2. the ball is moving upward and forward with the train.
2 dimensional motion because it is moving up and down and forward.
Trying to make the crash last longer (airbags, seatbelts, etc)
Why does a ball bounce lower after each bounce? what is the system open to?
losing energy so the system is open to energy.
Imagine you are in space with no landmarks to nearby to judge motion. how would you determine if you are moving or stationary? How does frame of reference play a role in this?
You cannot determine your motion without having a landmark/object to create a frame of reference.
What career did we talk about that connects with motion and frame of reference?
Animation
Which collision would have a higher impulse?
1. 3 second collision of 15 newtons of force.
2. 7 second collision of 15 newtons of force.
3 second collision of 15 newtons of force.
When does potential energy become kinetic?