What is the difference between speed and velocity?
Speed is how fast you are moving.
Velocity is how fast you are moving and your direction.
100
What is the mathematical formula for work?
Work = Force x Distance.
100
Would a chemical reaction that absorbs heat feel hot or cold to the touch?
Cold.
100
What is the difference between charging by contact and charging through induction?
In charging by contact, the objects in question are touching. In charging by induction, the objects are near each other, but are not touching.
100
What types of electrical charges repel one another? Similar or different?
Similar charges repel one another.
200
Mechanical motion is defined by whose three laws?
Issac Newton's.
200
Define mechanical advantage.
The ratio of output force to that of input force.
(Output Force) / (Input Force)
200
What type of energy is present whenever an object is moving?
Kinetic energy.
200
The flow of electric charges creates what type of field?
Magnetic field.
200
What is an electric current?
Flowing electrical charges.
300
Define one of the three laws of motion.
An object has constant velocity until an external force acts upon it.
Force = Mass x Acceleration.
For every action there is an equal and opposite reaction.
300
What is another word for the amount of energy required to move an object?
Work.
300
Thermal energy transferred through energy wave emission is also known as what?
Radiation.
300
What is the imbalance of electrical charges that result in a static discharge?
Static charge.
300
Two point charges generate what type of field?
An electric field.
400
Velocity is the change in what?
Position.
400
What is the advantage of using a simple machine?
Less force is required to do the same amount of work.
400
State the Law of Conservation of Energy.
Energy is neither created nor destroyed- it only changes forms.
400
What is a measure of how difficult it is for electrons to flow in an object?
Electrical resistance.
400
What is potential energy?
Energy converted when kinetic energy is "stored." i.e. a compressed spring or an object raised up high.
500
Define acceleration.
The change in velocity.
500
What is the difference between the two classes of simple machines? (Vector vs Torque)
Vector: Inclined Plane
Torque: Lever
Torque types impart a moment on an object while vector types require a smaller amount of force spread over a long distance.
500
What is the difference between an endothermic and exothermic chemical reaction?
An endothermic reaction absorbs heat while an exothermic reaction releases heat.
500
Describe how a hydro electric plant produces electricity.
Water pushes turbines that contain iron. As the iron turbines rotate, their magnetic field moves electrons and produces an electric current via electromagnetic induction.
500
How does the ground help you move?
For every action there is an equal and opposite reaction. Therefore, when you push on the ground, the normal force from the ground pushes you back and you move forward.