Circular Motion and Gravitation Practice Test
... MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5 km/h. What is the magnitude of the net force on the motorcycle? A) 4.31 × 10 4 N B) 2.95 × 10 3 N C) 1.31 × 10 ...
... MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5 km/h. What is the magnitude of the net force on the motorcycle? A) 4.31 × 10 4 N B) 2.95 × 10 3 N C) 1.31 × 10 ...
( )x ( )y
... The tension in the string is a force pulling the puck toward the spike. If the string is suddenly cut, according to Newton’s first law, the puck will resist this change of motion by moving out of the circular path in a direction away from the spike. 8. For an object resting on a horizontal surface, ...
... The tension in the string is a force pulling the puck toward the spike. If the string is suddenly cut, according to Newton’s first law, the puck will resist this change of motion by moving out of the circular path in a direction away from the spike. 8. For an object resting on a horizontal surface, ...
v 2
... The first condition for equilibrium that we have discussed is namely, the sum of all the external forces is zero. With no net forces acting on an object it obeys Newton’s first law, I.e. no accelerations and thus no changes in motion. (F= 0) The object could still rotate and change its rate of rota ...
... The first condition for equilibrium that we have discussed is namely, the sum of all the external forces is zero. With no net forces acting on an object it obeys Newton’s first law, I.e. no accelerations and thus no changes in motion. (F= 0) The object could still rotate and change its rate of rota ...
1988
... the clockwise torques equal the counterclockwise torques. The definition of torque is distance times force times sine of the angle between the force and the radius vectors. (The radius is drawn from the pivot point to the point where the force is applied.) In the present case, clock = (5 kg)(g)(l ...
... the clockwise torques equal the counterclockwise torques. The definition of torque is distance times force times sine of the angle between the force and the radius vectors. (The radius is drawn from the pivot point to the point where the force is applied.) In the present case, clock = (5 kg)(g)(l ...
v mf - Yimg
... The advantages of using a dielectric in a capacitor as active mass are: 1) Large internal energy variations are easily obtainable 2) Fast internal energy variation are easily obtainable On the other hand, both device types have challenges to getting the dielectric properly accelerated. In the piezo- ...
... The advantages of using a dielectric in a capacitor as active mass are: 1) Large internal energy variations are easily obtainable 2) Fast internal energy variation are easily obtainable On the other hand, both device types have challenges to getting the dielectric properly accelerated. In the piezo- ...
South Pasadena · AP Chemistry
... state the two situations where acceleration is zero (standing still & moving at a constant speed in a straight line) and relate these situations to net force (zero net force). 4-Newton’s First Law ...
... state the two situations where acceleration is zero (standing still & moving at a constant speed in a straight line) and relate these situations to net force (zero net force). 4-Newton’s First Law ...
Josh`s physics kinematics outline
... The sum of all the forces acting on an object is called the net force. If the object is not moving, or if the object is at a constant velocity, the net force is 0. To describe the object, you say it is in equilibrium. There are many types of forces that act on objects. Frictional force, which is cre ...
... The sum of all the forces acting on an object is called the net force. If the object is not moving, or if the object is at a constant velocity, the net force is 0. To describe the object, you say it is in equilibrium. There are many types of forces that act on objects. Frictional force, which is cre ...
review question for mid exam 2
... 20. A 108 N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable. ...
... 20. A 108 N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable. ...
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.