PHYSICS 214 TEST 1 12 February 2008
... have identical masses and collide elastically. After the collision, which statement is true: A. (1) recoils backward at 3.5 m/s and (2) moves forward at 3.5 m/s B. (1) recoils backward at 3.5 m/s and (2) remains at rest C. (1) is at rest; (2) moves backward at 3.5 m/s D. (1) is at rest; (2) moves fo ...
... have identical masses and collide elastically. After the collision, which statement is true: A. (1) recoils backward at 3.5 m/s and (2) moves forward at 3.5 m/s B. (1) recoils backward at 3.5 m/s and (2) remains at rest C. (1) is at rest; (2) moves backward at 3.5 m/s D. (1) is at rest; (2) moves fo ...
Newton`s Laws II - Rutgers Physics
... A) Measure acceleration and tension simultaneously using a force and a motion sensor. 0. First, test the four wheels on the Pasco cart by spinning each one by hand to see if it spins for at least 3 seconds before stopping. If it stops quickly, try pushing the wheels (along their axes) away from the ...
... A) Measure acceleration and tension simultaneously using a force and a motion sensor. 0. First, test the four wheels on the Pasco cart by spinning each one by hand to see if it spins for at least 3 seconds before stopping. If it stops quickly, try pushing the wheels (along their axes) away from the ...
Document
... A wave is incident on a boundary between two media X and Y at an angle of incidence i. AB represents the incident wavefront and CD the refracted wavefront. Which of the following statements is/are correct? ...
... A wave is incident on a boundary between two media X and Y at an angle of incidence i. AB represents the incident wavefront and CD the refracted wavefront. Which of the following statements is/are correct? ...
Special Rotational Dynamics Outline
... equation, r sin θ is the perpendicular distance between a line along the direction of motion and the reference point/axis of rotation. For an object moving in a circular path of radius r, its angular momentum is simply L = mvr. For rigid objects rotating about a fixed axis (with no translation of th ...
... equation, r sin θ is the perpendicular distance between a line along the direction of motion and the reference point/axis of rotation. For an object moving in a circular path of radius r, its angular momentum is simply L = mvr. For rigid objects rotating about a fixed axis (with no translation of th ...
r - God and Science
... Thus, in uniform circular motion there must be a net force to produce the centripetal acceleration. The centripetal force is the name given to the net force required to keep an object moving on a circular path. The direction of the centripetal force always points toward the center of the circle and ...
... Thus, in uniform circular motion there must be a net force to produce the centripetal acceleration. The centripetal force is the name given to the net force required to keep an object moving on a circular path. The direction of the centripetal force always points toward the center of the circle and ...
Concept-Development Practice Page
... a. Acceleration is (decreasing) (constant) (increasing). b. If the ramp were steeper, acceleration would be (more) (the same) (less). c. When the ball reaches the bottom and rolls along the smooth level surface it (continues to accelerate) (does not accelerate). ...
... a. Acceleration is (decreasing) (constant) (increasing). b. If the ramp were steeper, acceleration would be (more) (the same) (less). c. When the ball reaches the bottom and rolls along the smooth level surface it (continues to accelerate) (does not accelerate). ...
Force - The Physics Doctor
... We defined current as the rate of flow of charge and this can be applied to anything that is carrying a charge (charge carriers) such as conventionally, the electron. This can be expressed simply mathematically with the formula: ...
... We defined current as the rate of flow of charge and this can be applied to anything that is carrying a charge (charge carriers) such as conventionally, the electron. This can be expressed simply mathematically with the formula: ...
Monday, Sept. 16, 2002 - UTA HEP WWW Home Page
... In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity. What does this statement tell us? 1. When no force is exerted on an object, the acceleration of the object is 0. 2. Any isolated object, the object that do not i ...
... In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity. What does this statement tell us? 1. When no force is exerted on an object, the acceleration of the object is 0. 2. Any isolated object, the object that do not i ...
Wednesday, February 25 , 2009
... Determine the magnitude and direction of the acceleration of the puck whose mass is 0.30kg and is being pulled by two forces, F1 and F2, as shown in the picture, whose magnitudes of the forces are 8.0 N and 5.0 N, respectively. ...
... Determine the magnitude and direction of the acceleration of the puck whose mass is 0.30kg and is being pulled by two forces, F1 and F2, as shown in the picture, whose magnitudes of the forces are 8.0 N and 5.0 N, respectively. ...
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.