# chapters 3-4 review deleted S8

## 36 terms

### uniform motion

motion in which the velocity of the moving object does not change

### accelerated motion

motion in which the velocity of the moving object does change

### positive acceleration

velocity changes and speed increases or direction changes

### negative acceleration

velocity changes and speed decreases

### law of universal gravitation

states that a particle of matter in the universe will attract another particle with a force known as gravity

### Newton

metric unit of force and weight

### directly related

if mass of either of the objects increases

### inversely related

gravitational attraction id greater when objects are closer together and less when they are far apart

### first law of motion

states that the velocity of an object is not changed unless it is acted upon by an outside force

### second law of motion

states that the acceleration of an object is directly related to the strength of the force and inversely related to the object's mass

### third law of motion

states that for every there is an equal and opposite reaction

### mechanical energy

matter in motion or with the potential of motion

energy of motion

### Albert Einstein

showed that under certain extraordinary conditions mass is not conserved

### joule

the metric unit of work and energy

### James Watt

devised the common unit of power in the English system

### horsepower

Watt estimated that a horse could lift 550 pounds a distance of 1 foot in 1 second

### lever

can multiply force or speed with or without changing the direction of the effort

### atomic theory of matter

proposed that all matter is made up of extremely small particles which combine into molecules

### Daniel Bernoulli

came up with the kinetic theory of matter

### kinetic theory of matter

states that the molecules of matter are in constant motion

### gravitational pressure

pressure exerted by a fluid at a given depth is applied equally in every direction

### Pascal's principle

- states that the pressure applied to any surfaced of a confined fluid is transmitted equally in every direction throughout the fluid
- Blaise Pascal

### pascal

metric unit of pressure

### Boyle's law

states that if the temperature of a gas remains constant, its volume and pressure are inversely related

### Charles's law

states that if the pressure of a gas is constant, its volume and temperature are directly related

### Archimede's principle of buoyancy

states that the weight lost by an abject immersed in a fluid is equal to the weight of the liquid displaced

### Bernoulli principle

states that the side ward pressure exerted by a moving liquid decreases as the fluid's velocity increases

### gas turbines

special type of internal-combustion engine that produces a great amount of power

### d= mass/volume

formula of density

formula of speed

### v= lwh

formula of volume

### a= force/mass

formula of acceleration

formula of force

formula of power

### p= force/area

formula of pressure