excurse to the history of inertial force
... certain state or activity after its cause, which originally supported this state or activity ceased to act. After Aristotle, scientists seek for causes of everything that happens. After the scientific revolution of the 17th century, even in general, non-scientific context, we often replace the word ...
... certain state or activity after its cause, which originally supported this state or activity ceased to act. After Aristotle, scientists seek for causes of everything that happens. After the scientific revolution of the 17th century, even in general, non-scientific context, we often replace the word ...
Physics Midterm Review Multiple Choice Identify the choice that best
... 70. What is the magnitude of the resultant displacement of a dog looking for its bone in the yard if the dog first heads 57.0 north of west for 10.3 m and then turns and heads west for 4.00 m? 71. A stone is thrown at an angle of 30.0 above the horizontal from the top edge of a cliff with an init ...
... 70. What is the magnitude of the resultant displacement of a dog looking for its bone in the yard if the dog first heads 57.0 north of west for 10.3 m and then turns and heads west for 4.00 m? 71. A stone is thrown at an angle of 30.0 above the horizontal from the top edge of a cliff with an init ...
1 A car engine applies a force of 65 kN, how much work is done by
... 92. A 255 N force is applied to a 46 kg box that is located on a flat horizontal surface. The coefficient of kinetic friction between the box and the surface is 0.3. a. Sketch a free-body diagram and show all the applied forces. b. Find the acceleration of the box c. How far the box will go in 10 s? ...
... 92. A 255 N force is applied to a 46 kg box that is located on a flat horizontal surface. The coefficient of kinetic friction between the box and the surface is 0.3. a. Sketch a free-body diagram and show all the applied forces. b. Find the acceleration of the box c. How far the box will go in 10 s? ...
Common Exam - 2001 Department of Physics University of Utah August 25, 2001
... solutions. Please note that there is a separate booklet for each numbered question (i.e., use booklet #1 for problem #1, etc.). To receive full credit, not only should the correct solutions be given, but a sufficient number of steps should be given so that a faculty grader can follow your reasoning. ...
... solutions. Please note that there is a separate booklet for each numbered question (i.e., use booklet #1 for problem #1, etc.). To receive full credit, not only should the correct solutions be given, but a sufficient number of steps should be given so that a faculty grader can follow your reasoning. ...
+ • C - Purdue Physics
... Q4 In the situation pictured in question 3, if there is a frictional force opposing the motion of the block, does this frictional force do work on the block? Explain. Yes it does negative work since force is opposite the motion ...
... Q4 In the situation pictured in question 3, if there is a frictional force opposing the motion of the block, does this frictional force do work on the block? Explain. Yes it does negative work since force is opposite the motion ...
+ • C - Purdue Physics
... Q4 In the situation pictured in question 3, if there is a frictional force opposing the motion of the block, does this frictional force do work on the block? Explain. Yes it does negative work since force is opposite the motion ...
... Q4 In the situation pictured in question 3, if there is a frictional force opposing the motion of the block, does this frictional force do work on the block? Explain. Yes it does negative work since force is opposite the motion ...
Mathematics is the language of physics
... • Operate between Nucleons • It may be attractive or repulsive • Its range is very short, within nuclear size (10-15 m). • Its strongest force in nature 4.Weak Nuclear force: • Operate within nucleons I.e. elementary particles like electron and neutrino. • It appears during radioactive b decay. • Ha ...
... • Operate between Nucleons • It may be attractive or repulsive • Its range is very short, within nuclear size (10-15 m). • Its strongest force in nature 4.Weak Nuclear force: • Operate within nucleons I.e. elementary particles like electron and neutrino. • It appears during radioactive b decay. • Ha ...
Momentum, Kinetic Energy and Arrow Penetration
... When an arrow’s net force after penetration (at the time of exit) is deducted from the (total disposable) net force of the arrow at the time of impact it equals the amount of the arrow’s disposable net force that was required for the arrow to completely penetrate the animal on that particular shot. ...
... When an arrow’s net force after penetration (at the time of exit) is deducted from the (total disposable) net force of the arrow at the time of impact it equals the amount of the arrow’s disposable net force that was required for the arrow to completely penetrate the animal on that particular shot. ...
Document
... Earth; the reaction is the force of the Earth on his foot. (b) The action is the force exerted on the girl’s back by the snowball; the reaction is the force exerted on the snowball by the girl’s back. (c) The action is the force of the glove on the ball; the reaction is the force of the ball on the ...
... Earth; the reaction is the force of the Earth on his foot. (b) The action is the force exerted on the girl’s back by the snowball; the reaction is the force exerted on the snowball by the girl’s back. (c) The action is the force of the glove on the ball; the reaction is the force of the ball on the ...
Momentum Momentum
... For all elastic collisions, regardless of the masses of the objects, the objects separate after the collision with the same relative speed that they collided with. ...
... For all elastic collisions, regardless of the masses of the objects, the objects separate after the collision with the same relative speed that they collided with. ...
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.