Measure where the object is initially. Measure where the object is at some later time. Determine the difference between these two position values. Be sure to note that displacement is not the same as distance travelled.
Midterm Study Guide This study guide summarizes Physics midterm study guide things you'll need to know for the midterm exam. In some cases, the full level of detail is not covered here, so consult the relevant material for more.
Nothing will be presented on the exam that has not been covered in lectures. The exam will cover material through Lecture 11, and chapters 1—3 and sections 4.
The front page of the exam will contain equations of relevance but they will not be labeled as to what they pertain toas well as any necessary constants and conversion factors. Understand that energy is the capacity to do work. Work is a force times a distance: There are a number of units for energy, but our primary unit is the Joule.
If you think about the formula for kinetic energy: Other units of energy that we use: Our standard unit is the Watt, which is equivalent to one Joule per second.
Another familiar unit of power is the horsepower, about W. Wind energy is really just kinetic energy of moving air. All you need to know is the mass and velocity of the air, then use the formula for kinetic energy. This is the most energy you can pull out of the air, and corresponds to stopping the air completely.
In practice, some fraction of this total energy is available to a windmill. Gravitational potential energy is the energy given to objects lifted in the gravitational field. It takes force to lift an object, and acting through some vertical distance results in work taking energy.
This energy can be released at some later time e. Gravitational potential energy is given by mgh, where m is the mass, g is the acceleration due to gravity mg is the force required to lift the object, or its weight in Newtonsand h is the distance through which the object is lifted.
Heat energy is the amount of energy it takes to heat something up. Examples of heat energy are contained in the list of units above specifically, the Btu, the calorie, and the kilocalorie.
Chemical energy results from the rearrangement of atoms in molecules, and often results in local deposition of heat e. Sometimes the energy can be converted to electrical forms battery.
Typical energy content is several kcal Calories per gram. Mass-energy draws a fundamental connection between our concepts of mass and energy. All energy actually has mass i. For all intents and purposes, mass is conserved in our ordinary experience.
Radiant energy is the energy associated with thermal radiation of light. All objects glow by thermal radiation. The flux of energy dissipation is given by: The temperature must be represented in Kelvin for this to work. Be able to perform simple calculations on all the above forms of energy, and intermingle concepts power associated with some energy process over some amount of time, for instance, or exchange of potential energy for kinetic energy or heat energy.
Energy is Conserved, meaning that energy cannot be created nor destroyed, but can flow between forms. More technically correct is the statement that mass-energy is conserved, to account for the fact that mass can be converted directly to energy and vice-versa.Documents Similar To Physical Science Midterm Study Guide.
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Regents Physics Midterm Study Guide. VECTORS. Always ensure you know which direction the vectors are pointing in. Draw vector/free body diagrams to help determine the direction/magnitude of the resultant vector.
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0° north of west with a speed of 0 km/hr. Three hours later, the hurricane suddenly shifts .