Unit B - Physics Flashcards
How would you determine the average speed of a given object?
Average speed = distance travelled/time elapsed
V = d (final) - d (initial)/t (final) - t(initial)
What is the difference between a scalar quantity and a vector quantity?
A scalar quantity only indicates the magnitude of the quantity, whereas a vector quantity indicates both magnitude and direction.
Describe uniform motion
Uniform motion is a term used to describe an object that is traveling at a constant rate of motion in a straight line.
Describe the X axis method of plotting a graph
- up and right are positive
* down and left are negative
Describe the navigator method of plotting a graph
- North and east are positive
* South and west are negative
What is the formula for average velocity?
Average velocity = displacement/time elapsed
Difference between distance and displacement
Distance is a scalar quantity whereas displacement is a vector quantity.
List two ways that positive acceleration can occur
Positive acceleration can occur when the change in both the magnitude of the velocity and the direction are positive or when the change in both the magnitude of the velocity and the direction are negative.
List two ways that negative acceleration can occur
Negative acceleration occurs when the change in the magnitude of the velocity is negative while the direction is positive or when the change in the magnitude of the velocity is positive and the direction is negative.
What is the formula for analyzing accelerated motion?
Acceleration = change in velocity/time interval
v(f) - v(i)/t(f) - t(i)
What is force?
Force is defined as a push or a pull on an object, it is measured in newtons.
What happens when an unbalanced force is applied to an object?
When an unbalanced force is applied to an object, the object will gain or lose energy which in turn leads to a change in motion.
Define “work” in a physics context
Whenever a force moves an object through a distance that is in the direction of the force, work is done on the object.
What is the formula to find the amount of work done on an object?
Work = force x distance
W = Fd
Measured in joules (J)
Three conditions for work to be done on an object.
- there must be movement
- there must be a force
- The force and the distance the object travels must be in the same direction
Define chemical energy
Chemical energy is the potential energy stored in the chemical bonds of compounds.
Define electrical energy
Electrical energy is the work done by moving charges.
Define nuclear energy
Nuclear energy is the potential energy stored in the nucleus of an atom.
Define solar energy
Solar energy is energy from the sun. This energy travels to Earth as electromagnetic radiation.