Matter
Which type of property can be measured without producing a new substance?
physical property
Name four types of energy we've studied.
KE - PE - ME - electrical energy
chemical energy - sound energy
thermal energy - light energy
nuclear energy
Which atomic particles carry electricity?
electrons
What makes velocity different from speed?
A velocity is a speed with a direction
(for example, 65 miles per hour north is a velocity)
What is the name for the combination of all the forces acting on an object?
net force
What is the BEST sign that a chemical change has occurred?
a new substance is produced
OR
chemical bonds are made or broken
What two properties affect how much KE an object has?
Opposite electric charges __
Like electric charges __
Opposite electric charges attract
Like electric charges repel
Model (draw or use words) a position versus time graph for a student who gets up from their desk, walks to the tissue box, stops to blow their nose, and walks back to their desk.
Starts at 0 with a positive slope, then goes horizontal with zero slope for a while, then returns to 0 with a negative slope
When the forces on an object are balanced, what will happen to the object's motion?
Nothing: it will not change. Balanced forces means no acceleration.
What particle is all matter made of, and what three smaller particles are inside it?
atom
protons, electrons, neutrons
What two properties affect how much gravitational PE an object has?
mass and height
Where on a magnet is the magnetic force the strongest?
At the poles
What is the name for the rate of change of velocity?
acceleration
What is the name for an object's resistance to a change in motion?
inertia
On the periodic table, elements in the same ____ have similar properties.
group OR column
When firewood burns, __ energy in the wood is transformed into __ energy.
chemical energy in the wood is transformed into thermal energy OR light energy OR sound energy
Name the three ways to make an electromagnet stronger.
more wire turns
large iron core
more current
There are three ways velocity can change. What are they?
speeding up
slowing down
changing direction
Which of Newton's laws of motion explains why we have to push backward on the floor in order to walk forward?
Newton's third law: for every action force, there is an equal but opposite reaction force
The law of conservation of mass says three very important things. What are they?
1. Matter CANNOT be __
2. Matter CANNOT be __
3. Matter can ONLY be __
The law of conservation of mass says three very important things. What are they?
1. Matter CANNOT be created
2. Matter CANNOT be destroyed
3. Matter can ONLY be transformed
The law of conservation of energy says three very important things. What are they?
1. Energy CANNOT be __
2. Energy CANNOT be __
3. Energy can ONLY be __
1. Energy CANNOT be created.
2. Energy CANNOT be destroyed.
3. Energy can ONLY be transformed.
In an electric generator, __ energy is transformed into __ energy.
ME (or KE) is transformed into electrical energy
Model (draw or use words) a position versus time graph for a runner who starts at the starting line and begins running as fast as they can.
Starts at 0 with a curved, positive slope
Curve is required -- this shows acceleration
If it wasn't curved it would be constant velocity
Imagine a basketball 10 feet above the Earth's surface. Imagine an identical basketball 10 feet above the moon's surface. How would the basketball on the moon act differently than the basketball on Earth?
it would fall more slowly because the moon has less gravity, due to it having less mass than the Earth