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Laws
Equation
Problems/Vocabulary
100
Newton's law of gravity
The principle that expresses the force of gravitational attraction between two bodies as a function of their mass and their distance.
100
What is the equation for Newton's gravity law?
Fnet = m • a
100
What is inertia?
the resistance an object has to a change in its state of motion.
200
Avogadro's Law (1811)
Equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules. It is, in fact, only true for ideal gases.
200
Equation for Ohm's Law
V = I R
200
An object has a normal force of 20N and a gravitational force of 20N. What is the net force of the object?
0
300
Ampere's Law
The line integral of the magnetic flux around a closed curve is proportional to the algebraic sum of electric currents flowing through that closed curve; or, in differential form curl B = J. This was later modified to add a second term when it was incorporated into Maxwell's equations.
300
How to calculate average speed?
Average Speed=Distance traveled/Time of travel
300
What is apply force?
An applied force is a force that is applied to an object by a person or another object.
400
What is Ohms' Law?
Ohm's Law deals with the relationship between voltage and current in an ideal conductor. This relationship states that: The potential difference (voltage) across an ideal conductor is proportional to the current through it.
400
Kinematic Equation for final velocity
Vf^2=Vi^2*a*d
400
Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with? Explain why.
Tosh is correct. Inertia is that quantity which depends solely upon mass. The more mass, the more inertia. Momentum is another quantity in Physics which depends on both mass and speed. Momentum will be discussed in a later unit.
500
What does Newton's laws say?
1.An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. 2.Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). 3.For every action there is an equal and opposite re-action.
500
Kinematic Equation for distance
D=Vi*t+1/2*a*t^2
500
An applied force of 20 N is used to accelerate an object to the right across a frictional surface. The object encounters 10 N of friction. Use the diagram to determine the normal force, the net force, the coefficient of friction (μ) between the object and the surface, the mass, and the acceleration of the object. (Neglect air resistance.)
Note: To simplify calculations, an approximated value of g is often used - 10 m/s/s. Answers obtained using this approximation are shown in parenthesis. Fnorm = 100 N; m = 10.2 kg; Fnet = 10 N, right; "mu" = 0.1; a =0.980 m/s/s, right ( Fnorm = 100 N; m = 10 kg; Fnet = 10 N, right; "mu" = 0.1; a =1 m/s/s, right ) Since there is no vertical acceleration, the normal force is equal to the gravity force. The mass can be found using the equation Fgrav = m * g. Using "mu" = Ffrict / Fnorm, "mu" = (10 N) / (100 N) = 0.1. The Fnet is the vector sum of all the forces: 100 N, up plus 100 N, down equals 0 N. And 20 N, right plus 10 N, left = 10 N, right. Finally, a = Fnet / m = (10 N) / (10.2 kg) = 0.980 m/s/s.