Lecture 1: Basics Of Physics STUDY GUIDE FOR QUIZ
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What is the difference between mass and weight?
Mass is the amount of matter in an object. Weight is the force of gravity on an object.
Velocity is a ___
Vector
What do vectors have?
Both magnitude and direction
Scalar quantities have ___
Magnitude only Examples: weight, height, distance
Velocity infers that there was…
A change in position
Total displacement of an object is 0 when…
The object returns back to the original position where it started
Acceleration is a ___
Vector, because it describes how velocity changes with each second in time.
Acceleration is measured in…
Meters/second^2
A force is…
A push or a pull
Force of gravity =
9.8m/s^2
Pressure =
Force/area
How do you increase pressure?
Increase force or decrease area
How do you decrease pressure?
Decrease force or increase area
What is the effect of doubling the diameter of a syringe on the pressure within?
If you double the diameter of the syringe, you decrease the pressure by a factor of 4.
What does it mean if the reading on the bourdon gauge is 0?
There is still pressure in the tank–atmospheric pressure (14 psi)
What is work?
Work = force X displacement (distance) -If there’s no force, there’s no work; if there’s no displacement, there’s no work
What is work measured in?
Joules
What is kinetic energy?
Energy of mass in motion
What is internal energy?
The sum of all kinetic and potential energies in a system
What is energy?
The capacity to do work
What is energy measured in?
Joules
What are 3 state functions?
• Temperature • Pressure • Volume
Calories
Big C = calories in the food that we eat (kilocalories, 1000 calories)
What is potential energy?
Stored energy Examples: calories that we eat, electricity in batteries