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Newton's Laws
Equations
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Miscellaneous
Problem Solving
100
An object in motion or at rest will tend to stay in motion or at rest until it is acted upon by an outside force
Newton's First Law (The Law of Inertia)
100
What is the equation for power?
P = dW/dt
100
Measurement in slugs, grams, or any prefix unit based on grams refers to what?
Mass of an object
100
Name the three kinds of energy
Mechanical, Chemical, Electrical
100
A person pushes a rock with an acceleration of 0.12 m/sec^2 east. If the rock has a mass of 4.2 x 10^4 g, what force is the person exerting to move it?
5.0 Newtons east
200
State Newton's Third Law
For every action, there is an equal and opposite reaction
200
State the equations for Potential Energy and Kinetic Energy
PE = mgh KE = 0.5mv^2
200
Measurement given in Newtons, dynes, or pounds refers to what?
Weight
200
An object moves at a constant speed. Is the acceleration necessarily zero?
No
200
A 75-kg man stands on a level floor. What is the normal force that the floor exerts on the man?
740 Newtons straight up
300
When an object is acted on by one or more outside forces, the vector sum of those forces is equal to the mass of the object times the resulting acceleration vector.
Newton's Second Law
300
Centripetal Force from friction
Fc = u * Fn
300
A pound is what in terms of slugs?
(slug * ft)/(sec^2)
300
Are torques that cause clockwise motion positive or negative? What about torques that cause counter clockwise motion?
Clockwise - Negative torques Counter Clockwise - Positive torques
300
A 151-g toy truck travels on a circular track whose radius is 1.1 meters. If the truck travels at a constant speed of 2.1 meters per second, what are the magnitudes of the centripetal force and acceleration?
Centripetal force - 0.61 Newtons Acceleration - 4.0 m/sec^2
400
What kind of motion does Newton's Second Law extended to?
Rotational motion
400
T = F * r where F represents the component of the applied force that is perpendicular
Torque
400
What is a dyne equivalent to?
(g * cm)/(sec^2)
400
Name the 3 types of equilibrium discussed in this section
Translational, Static, Dynamic
400
A 6675-Newton car spins down the highway at 37 m/sec. What is its kinetic energy?
4.7 x 10^5 Joules
500
Was Galileo or Aristotle the inspiration for Newton's First Law?
Galileo
500
Centripetal Force from Gravity
F = (G * m1 * m2)/(r^2)
500
(kg * m^2)/(sec^2) is what unit of measurement?
Joule
500
What is the universal gravitational constant?
6.67 x 10^-11 (Newton * m^2)/(kg^2)
500
A 230-gram toy car is pushed so that it rolls across a level floor. If it starts with a kinetic energy of 0.46 Joules, how fast will it be going when it gets to the other side of the room, after friction has done 0.30 Joules of work?
1.2 m/sec