phys1441-summer14-070314
... Choose a convenient set of x and y axes and write down the force equation for each x and y component with correct signs. Apply the equations that specify the balance of forces at equilibrium. Set the net force in the x and y directions equal to 0. Select the most optimal rotational axis for torque c ...
... Choose a convenient set of x and y axes and write down the force equation for each x and y component with correct signs. Apply the equations that specify the balance of forces at equilibrium. Set the net force in the x and y directions equal to 0. Select the most optimal rotational axis for torque c ...
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... Second Law describes what happens when there is a force. And lastly, his Third Law describes what happens when objects interacting. Newton’s Third Law states that for every action force, there is an equal and opposite reaction force. This law is also known as the Law of Action-Reaction Pair. A force ...
... Second Law describes what happens when there is a force. And lastly, his Third Law describes what happens when objects interacting. Newton’s Third Law states that for every action force, there is an equal and opposite reaction force. This law is also known as the Law of Action-Reaction Pair. A force ...
Performance Benchmark P
... Second Law describes what happens when there is a force. And lastly, his Third Law describes what happens when objects interacting. Newton’s Third Law states that for every action force, there is an equal and opposite reaction force. This law is also known as the Law of Action-Reaction Pair. A force ...
... Second Law describes what happens when there is a force. And lastly, his Third Law describes what happens when objects interacting. Newton’s Third Law states that for every action force, there is an equal and opposite reaction force. This law is also known as the Law of Action-Reaction Pair. A force ...
Momentum and Collisions
... Elastic and Inelastic Collisions Objects collide and bounce off of one another. Objects collide and stick together. Perfectly inelastic collision – a collision in which two objects stick together and move with a common velocity after colliding An example of a perfectly inelastic collision is when a ...
... Elastic and Inelastic Collisions Objects collide and bounce off of one another. Objects collide and stick together. Perfectly inelastic collision – a collision in which two objects stick together and move with a common velocity after colliding An example of a perfectly inelastic collision is when a ...
What is angular momentum?
... is no net torque (the forces are internal)so L is a constant but the moment of inertia changes and since L = Iω as I decreases ω increases. So if I decreases by a factor of 2 then ω increases by a factor of 2. The kinetic energy is = Iω2 so if I decreases the kinetic energy increases by the amount o ...
... is no net torque (the forces are internal)so L is a constant but the moment of inertia changes and since L = Iω as I decreases ω increases. So if I decreases by a factor of 2 then ω increases by a factor of 2. The kinetic energy is = Iω2 so if I decreases the kinetic energy increases by the amount o ...
Tangential Speed and Acceleration
... Center of Mass The point around which this hammer mass, with all of its mass concentrated rotates is the hammer’s center of mass. The center of mass at that point for purposes of analyzing traces out the parabola that is characteristic of projectile motion. its translational motion. For example, the ...
... Center of Mass The point around which this hammer mass, with all of its mass concentrated rotates is the hammer’s center of mass. The center of mass at that point for purposes of analyzing traces out the parabola that is characteristic of projectile motion. its translational motion. For example, the ...
Kinetics Key to Success Eight Step Process Friction
... (1) car’s engine is not strong enough to keep the car from being pushed out (2) friction between tires and road is not strong enough to keep car in a circle (3) car is too heavy to make the turn (4) a deer caused you to skid (5) none of the above ...
... (1) car’s engine is not strong enough to keep the car from being pushed out (2) friction between tires and road is not strong enough to keep car in a circle (3) car is too heavy to make the turn (4) a deer caused you to skid (5) none of the above ...
Phys132Q Lecture Notes
... "If you were standing at arm's length from someone and each of you had one percent more electrons than protons, the repelling force would be incredible. How great? Enough to lift the Empire State Building? No! To lift Mount Everest? No! The repulsion would be enough to lift a "weight" equal to that ...
... "If you were standing at arm's length from someone and each of you had one percent more electrons than protons, the repelling force would be incredible. How great? Enough to lift the Empire State Building? No! To lift Mount Everest? No! The repulsion would be enough to lift a "weight" equal to that ...
Fall 2005 MC Final Review
... D) The crate may be either at rest or moving with constant velocity. E) The crate may be either at rest or moving with constant acceleration. Page 10 42. In an experiment with a block of wood on an inclined plane, with dimensions shown in the figure, the following observations are made: (1) If the b ...
... D) The crate may be either at rest or moving with constant velocity. E) The crate may be either at rest or moving with constant acceleration. Page 10 42. In an experiment with a block of wood on an inclined plane, with dimensions shown in the figure, the following observations are made: (1) If the b ...
LAHS Physics - LAPhysics.com
... rope may be considered massless; and the pulley may be considered frictionless. The coefficient of static friction between the block and the plane is µs; and the coefficient of kinetic friction is k. ...
... rope may be considered massless; and the pulley may be considered frictionless. The coefficient of static friction between the block and the plane is µs; and the coefficient of kinetic friction is k. ...
Chapter 5 Examples
... We can walk forward because when one foot pushes backward against the ground, the ground pushes forward on the foot. ...
... We can walk forward because when one foot pushes backward against the ground, the ground pushes forward on the foot. ...
Teacher Resource Pack: Adapted for WAKE COUNTY Unit Planning
... acceleration: rate of increase of speed or velocity (example: accelerator pedal on a car) air resistance (drag): force of air pushing against the motion of an object balanced force: an object remains in place, no movement occurs control: part of an experiment that does not change, serves as the stan ...
... acceleration: rate of increase of speed or velocity (example: accelerator pedal on a car) air resistance (drag): force of air pushing against the motion of an object balanced force: an object remains in place, no movement occurs control: part of an experiment that does not change, serves as the stan ...
Mass versus weight
In everyday usage, the mass of an object is often referred to as its weight though these are in fact different concepts and quantities. In scientific contexts, mass refers loosely to the amount of ""matter"" in an object (though ""matter"" may be difficult to define), whereas weight refers to the force experienced by an object due to gravity. In other words, an object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons (newton is the unit of force, while kilogram is the unit of mass) on the surface of the Earth (its mass multiplied by the gravitational field strength). Its weight will be less on Mars (where gravity is weaker), more on Saturn, and negligible in space when far from any significant source of gravity, but it will always have the same mass.Objects on the surface of the Earth have weight, although sometimes this weight is difficult to measure. An example is a small object floating in a pool of water (or even on a dish of water), which does not appear to have weight since it is buoyed by the water; but it is found to have its usual weight when it is added to water in a container which is entirely supported by and weighed on a scale. Thus, the ""weightless object"" floating in water actually transfers its weight to the bottom of the container (where the pressure increases). Similarly, a balloon has mass but may appear to have no weight or even negative weight, due to buoyancy in air. However the weight of the balloon and the gas inside it has merely been transferred to a large area of the Earth's surface, making the weight difficult to measure. The weight of a flying airplane is similarly distributed to the ground, but does not disappear. If the airplane is in level flight, the same weight-force is distributed to the surface of the Earth as when the plane was on the runway, but spread over a larger area.A better scientific definition of mass is its description as being composed of inertia, which basically is the resistance of an object being accelerated when acted on by an external force. Gravitational ""weight"" is the force created when a mass is acted upon by a gravitational field and the object is not allowed to free-fall, but is supported or retarded by a mechanical force, such as the surface of a planet. Such a force constitutes weight. This force can be added to by any other kind of force.For example, in the photograph, the girl's weight, subtracted from the tension in the chain (respectively the support force of the seat), yields the necessary centripetal force to keep her swinging in an arc. If one stands behind her at the bottom of her arc and abruptly stops her, the impetus (""bump"" or stopping-force) one experiences is due to acting against her inertia, and would be the same even if gravity were suddenly switched off.While the weight of an object varies in proportion to the strength of the gravitational field, its mass is constant (ignoring relativistic effects) as long as no energy or matter is added to the object. Accordingly, for an astronaut on a spacewalk in orbit (a free-fall), no effort is required to hold a communications satellite in front of him; it is ""weightless"". However, since objects in orbit retain their mass and inertia, an astronaut must exert ten times as much force to accelerate a 10‑ton satellite at the same rate as one with a mass of only 1 ton.On Earth, a swing set can demonstrate this relationship between force, mass, and acceleration. If one were to stand behind a large adult sitting stationary on a swing and give him a strong push, the adult would temporarily accelerate to a quite low speed, and then swing only a short distance before beginning to swing in the opposite direction. Applying the same impetus to a small child would produce a much greater speed.