chapter 6
In water, acids separate into
hydrogen ions and negative ions
A change in position with respect to a reference point is
The SI unit of force is the
newton
The actual mechanical advantage of any machine is it's ________ divided by it's ________
inclined plane , change in it's height
What is the energy stored in the nucleus of an atom called?
A solution is a mixture that contains ________ .
solute particles (molecules or ions) that are too small to see.
The rate at which velocity is
acceleration
law of conservation of momentum
The total momentum of any group of objects remains the same, or is conserved, unless outside forces act jn the objects.
The amount of work done on an object is found by multiplying
changing the direction of your force
An object's mechanical energy is the sum of it's
kinetic energy and its potential energy.
Sugar water is an example of a a.) suspension b.) solution c.) solute d.) colloid
solution
What quantity can you calculate if you know that a car travels 30 kilometers in 20 minutes?
average speed
An object is floating in a container of water. Which force opposes gravity?
buoyant force
The fixed point that a lever pivots around is called the
When you stretch a rubber band, you give it
Litmus paper is an example of an indicator because
color changes
You are sitting in a stopped car and the car next to you backs up.Using the car next to you as a reference point, which direction do you appear to be moving?
acceleration
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.
Most gases become more soluble in liquid as the temperature
solids become more soluble, gases solubility decrease with increase in temperature
A family takes a car trip. They travel for an hour at
80 km/h and then 2 hours at 40 km/h. Find their average speed during the trip.
53 km/h
Where might it be possible to kick a soccer ball and have it never slow down?
Space
What is the best scientific definition of a machine?
A simple machine is a mechanical device that changes the direction or magnitude of a force.
To calculate power, divide the amount of energy transferred by
measured in kilowatt-hours, kWh.