Energy and Motion . Energy. Energy. The ability to do work or cause change. Two forms of energy: kinetic and potential Kinetic Energy = Energy of Motion Potential Energy = Stored energy, due to position or shape of the object. . Potential Energy. Potential to do work
Energy and Motion
The ability to do work or cause change.
Potential and Kinetic energy come in many forms:
lights, computers, etc.
What conversion takes place when an electric lamp is turned on?
Problem 1: A student is investigating potential and
kinetic energy by stretching a spring across
a table. When the student lets go, the
spring recoils. At which time is potential
energy in the spring being converted into
kinetic energy in this system?
A.when the spring is stretching
B.when the spring is fully stretched
C.when the spring is recoiling
D.when the spring is fully recoiled
Problem 2:The diagram below shows some positions in the path of pendulum swinging from a fixed point called a fulcrum. The pendulum is raised to the start position and released. At which two numbered positions is the potential energy of the pendulum most likely the same?
A.position 1 and position 3 B.position 1 and position 4
C.position 2 and position 3
D.position 2 and position 4
An object is in motion when its distance from another object is changing.
An object is in motion if it changes position relative to a reference point.
Change in Distance or Direction
The rate of change in position, OR how fast something moves.
Speed = Distance
Different kinds of Speed: Constant Speed, Average Speed and Instantaneous Speed.
VELOCITY describes both SPEED and DIRECTION
Velocity = Distance
What is the speed of a plane that traveled 3,500 miles from Boston to California in 7.0 hours?
What is its velocity?
Speed = Distance
Distance = Speed x Time
Time = Distance
It took 4.5 hours for a train to travel the distance between two cities at a velocity of 110 miles/hr. How many miles lie between the two cities?
What is the slope of A?
What is the slope of B?
How does C compare to A?
What does D represent?
Slope = Y2-Y1
The slope on a distance-time graph shows: