Energy
what is potential energy?
What type of force has a net force of 0?
balanced force
velocity uses what two factors?
speed and direction
what type of energy is affected by speed?
kinetic energy
rubbing a balloon on your head and watching your hair stand up is an example of what type of force?
electrical force
What is kinetic energy?
energy of motion
an unbalanced force will result in what?
the object will move
what do you call a change in velocity with respect to time?
acceleration
what type of energy is affected by the height above ground?
potential energy
what is an example of a contact force?
friction
Where would potential energy be the greatest on a roller coaster?
at the top
two people push on a swinging door both with a force of 50N on each side. Which way will the door go? is it balanced or unbalanced?
what does newton's first law state?
an object in motion will stay in motion unless acted upon by an outside source. (law of inertia)
a ball rolls down the hill then reaches the bottom and rolls for a short bit then comes to a stop. what force causes the ball to stop rolling?
friction
what is the difference between a contact and a non contact force?
contact forces touch and non contact forces do not.
the higher up an object is, the more ________ energy it has.
potential
two people lift together to move a couch to a new spot. one person exerts 40 N of force and the other 60 N. What is the net force and in what direction is the force?
100 N in same direction.
what does newton's second law state?
give an example of a force that acts from a distance (non contact force)
magnetic
gravitational
electrical
what does the law of conservation of energy state?
energy cannot be created or destroyed. only transferred or transformed from one form to another. (ex. potential to kinetic) the total amount of energy will always remain the same.
what is mechanical energy?
The sum of potential and kinetic energy
a ball is dropped from 100 m but only bounces back up 60 m. Why is that?
some of the energy is transferred into the ground or transformed into thermal or sound energy.
what does newton's third law state?
for every action there is an equal and opposite reaction.
what force causes water to fall from a waterfall?
gravitational force
what happens to the energy when a pendulum moves from the bottom to the top?
potential energy increases and kinetic energy decreases.