Fichas
Machines and motion mechanical forces
Fichas del conjunto (34)
- 1define "mechanics"the scientific study of motion
- 2define "energy"the ability to perform work
- 3What are some ways that objects move?In straight lines, in arcs, in circles, up and down. etc
- 4What force greatly affects motion on earth?Gravity
- 5List 3 ways mechanical energy is being moved around you.Door hinges, wheels, engines, scissors, automobiles, light switch
- 6What is potential energy?Energy that is stored and ready to be used
- 7What is kinetic energy?Energy that is being used
- 8Give examples of something with potential energyAnything 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 - 9Describe the transfer of energy between kinetic and potential energy that occurs during a roller coaster rideKinetic 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.
- 10Explain how a wind-up clock uses potential and mechanical energyKinetic 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
- 11The law of conservation of energy states that energy cannot be _____________ or _____________. It can only change form.Created, destroyed
- 12The first law of thermodynamics states that in a closed system, energy can not be created or destroyed, only _______________ or _________________Transformed or transferred
- 13The law of conservation of mass states that _______ cannot be created or destroyed, it can only change forms.matter
- 14Who 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
- 15Because velocity is speed in a particular direction, __________________ is movement in a particular direction.momentum
- 16What two quantities affect an object's momentummass and velocity
- 17The 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
- 18Mechanical force is _________ or ___________ on an objectpush, pull
- 19What is tension?A continuous pull on an object
- 20What is tensile strength? The amount of _______________ that an object can withstand.tension
- 21What is bouyancy?The force exerted by a gas or a liquid that is displaced.
- 22Name the Law: Energy can not be created or destroyed, it can only change formsConservation of energy
- 23Name the Law: In a closed system, energy can neither be created nor destroyed only transformed or transferredlaw of thermodynamics
- 24Name the law Changes of momentum in a closed system must be equalConservation of Momentum
- 25Name the law: Matter cannot be created or destroyed, it can only change formsConservation of Mass
- 26Name the force that resists movementFriction
- 27Name the force that is exerted by liquids and gases equal to the mass of displaced fluidBuoyancy
- 28What is tension?A continuous pull on an object
- 29What is a forcea push or pull
- 30A change in position due to an applied forcework
- 31is lifting a weight above your head considered workYes
- 32Is holding a weight above your head workno
- 33What is powerrate at which work is done
- 34a car has more ________ than my legs because it can do ___________ work in ____________ timepower, more, less
Información
- Descripción
- intro to physics 7th grade
- Creado por
- Kathryn Lewis
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