chapter 6
Most gases become more soluble in liquid as the temperature
solids become more soluble, gases solubility decrease with increase in temperature
A change in position with respect to a reference point is
motion
The SI unit of force is the
The amount of work done on an object is found by multiplying
changing the direction of your force
When you stretch a rubber band, you give it
Litmus paper is an example of an indicator because
What quantity can you calculate if you know that a car travels 30 kilometers in 20 minutes?
average speed
Friction always acts
irregularities of the surface on which the mass
The actual mechanical advantage of any machine is it's ________ divided by it's ________
inclined plane , change in it's height
To calculate power, divide the amount of energy transferred by
measured in kilowatt-hours, kWh.
in water, acids separate into
hydrogen ions and negative ions
The rate at which velocity is
acceleration
The factors that affect the gravitational force between two objects are
depends on two factors, mass and distance.
The fixed point that a lever pivots around is called the
What is the energy stored in the nucleus of an atom called?
Nuclear Energy
A scientist observes that an unknown solution turns blue litmus paper red and reacts with zinc to produce hydrogen gas. Which of the following best describes in the unknown solution?
an acid
You can calculate the acceleration of an object moving in straight line by dividing the _____ by the time
final speed-initial speed/time
The SI unit of momentum is
kg times m/s
Why does it take more work to carry a 22-N bag of birdseed to the third floor of a house than it takes to move a 16N bag of cat food to the second floor of a house
The birdseed has greater mass and has to be moved farther
An object's mechanical energy is the sum of it's.
kinetic energy and its potential energy.
Suppose you put equal amounts of pure water and salt water into separate ice cube trays of the same size and shape. What would you expect to happen when you put both trays in the freezer?
The pure water would freeze before the saltwater because the slat would lower the freezing point of the water.
Two objects traveling at the same speed have different velocities if they
object is its speed in a particular direction.
An object is floating in a container of water. Which force opposes gravity?
buoyant force
What is the best scientific definition of a machine?
mechanical device that changes the direction or magnitude of a force.
An object's mechanical energy is the sum of it's
kinetic energy and its potential energy.