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55 Cards in this Set
- Front
- Back
An object in a circle at a constant speed is accelerating.
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True
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Slope on a displavement versus time graph is speed.
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False
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If a position-time graph is concave up, then there is + acceleration.
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True
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Slope on a velocity time graph is acceleration
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True
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Area on a velocity time graph is speed
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False
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Inertia is the force that makes the planets orbit the sun.
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False
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Landing a ship on Saturn would be easy because it has a solid surface
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False
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The sun is closer to the earth in summer making it warmer
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False
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The tail of a comet is always behind the comet
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False
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The oort cloud is a nebula
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False
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Fusion is the splitting of atoms
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False
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Iron is the most stable atomic nucleus
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True
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The core of a red giant is hotter than its surface
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True
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The mass of a star determines where it is plaved on the Main Sequence
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False
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The hotter an object is, the redder it appears.
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False
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Small stars like our sun fuse carbon into iron
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False
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Microwaves are more energetic than visible light
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false
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White dwarf stars fuse helium in their cores
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True
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Very large stars have more mass so they live longer than smaller stars
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False
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A B2 type star that appears very dim is very far away.
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true
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The principle of inertia accounts for the horizontal motion of a projectile.
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True
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The net force acting on a projectile is zero
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False
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The verticle potition-time graph of a projectile is concave up
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false
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the slope of the horizontal position time graph of a projectile is zero
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true
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the acceleration at the top of a projectile's trajectory is zero
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false
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temperature is a measure of heat
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false
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heat is energy transferred mechanically
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false
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a force is an agent of change measured in joules
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false
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a force is conservaive if the work moving around a closed path is zero
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true
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there is pure energy that can be isolated from a system
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true
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the units kg*m/s^2 are equivalent to a joule
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false
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the units for the sine or cosine of an angle are degrees
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false
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positive work produces an increase in enegery
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true
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positive potential energy is associated with attractive forces
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true
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if the total energy of a sustem is zero, then it is a bound system
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true
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momentum is a measure of the intensity of motion
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true
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momentum is conserved in all collisions
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true
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kinetic energy is conserved in all collisions
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false
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if momentum is conserved, then the venter of mass movies constantly
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true
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a closed system for momentum is also closed for kinetic energy
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false
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the units kg*m/s^2 are equivilent to a newton-second
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false
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the product of force and distance is impulse
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false
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an impulse causes a change in momentum
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true
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if a system is accelerating then its momentum is conserved
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false
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when two masses collide, they must make contact
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false
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Model rockets may be constructed out of metal
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false
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the momentum of the rocket is conserved during its flight
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false
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the chemical energy in the fuel is converted into kinetic energy
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true
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during its flight, a model rocket becomes more stable
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true
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a rocket motor pushes against the ground to lift the rocket
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false
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a solar sail uses collisions with photons for thrust
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true
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CA glue is a good choice for gluing plastic parts
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false
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epoxy is a chemical mix of a resin and a hardener that is exothermis
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true
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epoxy is more difficult to use but provides a very high strength bond
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true
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a model rocket is less than 1500 g and uses a G motor or less
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true
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