kinetic energy
what is kinetic Energy
the energy an object has because of its motion, dependent on its mass and speed
an object has a kinetic energy of 100 j and a mass of 10 kg how fast is the object moving
4.47 m/s
resistance) is the force that opposes the motion of a ball, wheel, or cylinder as it rolls over a surface, caused primarily by the deformation
What is the Law of Conservation of Energy?
(Energy cannot be created or destroyed, only transformed).
two or more forces acting on an object are equal in strength (magnitude) but opposite in direction
How is kinetic energy different from potential energy
How is kinetic energy different from potential energy
Describe the energy transformations that occur in a typical light bulb.
(thermal energy)
pushing a book across the table
What is thermal energy?
heat energy
balanced force
what is the form used to calculate kinetic energy
KE = ½mv²
What are the energy transformations that happen when you strike a match
your hand's motion (mechanical energy)
a dimensionless number
What are the two main types of mechanical energy?
(Kinetic and Potential)
they have no effect on its motion,
how does the kinetic energy relate to the work done on the object
the net work done on an object equals the change in its kinetic energy
What are some common examples of mechanical energy
moving cars, swinging pendulums, a hammer hitting a nail, a rolling ball, a flying airplane, and wind turbines spinning
write (pen/pencil on paper), drive (tire grip, braking), hold objects, and even light matches
Define Kinetic Energy (KE).
(Energy of motion)
Friction is a force opposing motion between surfaces in contact, always acting opposite to movement, while balanced forces cancel out (no motion change), and unbalanced forces cause acceleration (motion change)
how do mass and speed affect kinetic energy of an object
Mass and speed both increase an object's kinetic energy (KE)
How do you measure energy in different scenarios (e.g., in food, in electricity)
Calories (kilocalories)
a contact force that resists the relative motion (sliding, rolling, or attempting to move) between two surfaces in contact, always acting opposite to the direction of motion or applied force, caused by microscopic irregularities and adhesion between the surfaces
When you burn wood, what happens to the chemical energy?
Converts to heat/light).
What is the unit for measuring force
Newton (N)