Machines and motion mechanical forces

Questão	Responda
define "mechanics"	the scientific study of motion
define "energy"	the ability to perform work
What are some ways that objects move?	In straight lines, in arcs, in circles, up and down. etc
What force greatly affects motion on earth?	Gravity
List 3 ways mechanical energy is being moved around you.	Door hinges, wheels, engines, scissors, automobiles, light switch
What is potential energy?	Energy that is stored and ready to be used
What is kinetic energy?	Energy that is being used
Give examples of something with potential energy	Anything that is above ground level, such as a person at the top of a slide. Also, a something that is wound up, like a yoyo
Describe the transfer of energy between kinetic and potential energy that occurs during a roller coaster ride	Kinetic energy is used to move the car to the top of the hill where it now has maximum potential energy. As the car moves down the hill this potential energy is converted into kinetic energy. At the bottom of the hill all of the potential energy has been changed and the car has maximum kinetic energy. As the car moves up the net hill the kinetic energy is again converted into potential energy.
Explain how a wind-up clock uses potential and mechanical energy	Kinetic energy from your hand is used to wind up or coil a spring inside the clock, thus giving it potential energy. The spring slowly unwinds, converting the potential energy into mechanical energy as the gears inside the clock move the hands of the clock
The law of conservation of energy states that energy cannot be _____________ or _____________. It can only change form.	Created, destroyed
The first law of thermodynamics states that in a closed system, energy can not be created or destroyed, only _______________ or _________________	Transformed or transferred
The law of conservation of mass states that _______ cannot be created or destroyed, it can only change forms.	matter
Who was the first scientist to show that heat is a form of energy that can be converted from mechanical energy. He used a brass paddle wheel stirring water in a copper vessel.	James Joule
Because velocity is speed in a particular direction, __________________ is movement in a particular direction.	momentum
What two quantities affect an object's momentum	mass and velocity
The law of conservation of momentum states that the momentum of a system after a collision must be the same as the momentum ________________ the collision.	before
Mechanical force is _________ or ___________ on an object	push, pull
What is tension?	A continuous pull on an object
What is tensile strength? The amount of _______________ that an object can withstand.	tension
What is bouyancy?	The force exerted by a gas or a liquid that is displaced.
Name the Law: Energy can not be created or destroyed, it can only change forms	Conservation of energy
Name the Law: In a closed system, energy can neither be created nor destroyed only transformed or transferred	law of thermodynamics
Name the law Changes of momentum in a closed system must be equal	Conservation of Momentum
Name the law: Matter cannot be created or destroyed, it can only change forms	Conservation of Mass
Name the force that resists movement	Friction
Name the force that is exerted by liquids and gases equal to the mass of displaced fluid	Buoyancy
What is tension?	A continuous pull on an object
What is a force	a push or pull
A change in position due to an applied force	work
is lifting a weight above your head considered work	Yes
Is holding a weight above your head work	no
What is power	rate at which work is done
a car has more ________ than my legs because it can do ___________ work in ____________ time	power, more, less

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Machines and motion mechanical forces

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	Criado por Kathryn Lewis mais de 4 anos atrás