Lesson 3 Acceleration
________ is the measure of the change in velocity during a period of time
What is Acceleration?
The net force of an object is zero an object at rest will remain at rest and a moving object will continue moving in a straight line with constant speed
What is Newtons 1st Law of motion?
To be done on an object an applied force must move the object in the direction of the force
What is work?
______________ is the ratio of force to area
What is pressure?
When you pluck a guitar string
What is sound energy?
The distance an object moves per unit of time
What is speed?
Balanced forces cause no change in the motion of objects
What is the relationship between balanced forces and motion of an object?
When work is done on an object the energy of the object increases
What is power?
The change in pressure between the top and the bottom of an object results in an upward force called the _________________
What is buoyant force?
________________ is the energy that an electric current carries.
What is Electric energy
An object accelerates (speeds up) (slows down) or (changes direction)
What are 3 ways an object can accelerate
The velocity of the car stays the same
What happens to the velocity of a moving car if the car forces on it are balanced?
The _______________ of a machine is the ratio of the output force to the input force
What is mechanical advantage?
_______________ states that the weight of the fluid displaced by an object is equal to the buoyant force on that object
What is the Archimedes principle?
The energy that electromagnetic waves carry
What is radiant energy?
An object moving the same distance each second is moving at a __________________
What is constant speed?
Inertia an object at rest will resist a change in motion
What effect does inertia have on the motion of an object?
Friction between moving parts converts some of the input work into thermal energy and decreases the ______________.
What is efficiency?
_________________ states that when pressure is applied to a fluid in a closed container the pressure increases by the same amount everywhere in the container
What is Pascal's principle?
___________________ is energy that is stored in the nucleus of an atom .
What is Nuclear energy?
_____________ is a change in velocity over time.
What is accelerate?
Friction opposes the motion of the book as it moves across the table?
What is slowing down and stopping
A _________________ does the work using only one movement.
What is a simple machine?
Speed, size and shape of an object as well as density
What is drag force?
___________ is the transfer of energy that occurs when a force is applied over a distance.
What is work?