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55 Cards in this Set

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