How Rockets
... mass of the vehicle lessens. As it does its inertia, or resistance to change in motion, becomes less. As a result, upward acceleration of the rocket increases. In practical terms, Newton’s second law can be rewritten as this: ...
... mass of the vehicle lessens. As it does its inertia, or resistance to change in motion, becomes less. As a result, upward acceleration of the rocket increases. In practical terms, Newton’s second law can be rewritten as this: ...
Greenock Academy Physics Department
... C13. Carry out calculations involving the relationship between weight, mass, acceleration due to gravity and/or gravitational field strength including situations where g is not equal to 10 Nkg-1; C14. Use correctly in context the following terms: mass, weight, inertia, gravitational field strength, ...
... C13. Carry out calculations involving the relationship between weight, mass, acceleration due to gravity and/or gravitational field strength including situations where g is not equal to 10 Nkg-1; C14. Use correctly in context the following terms: mass, weight, inertia, gravitational field strength, ...
Physics 111 Practice Problems
... Problem 9 – 39P*: A vessel at rest explodes, breaking into three pieces. Two pieces, having equal mass, fly off perpendicular to one another with the same speed of 30 m/s. The third piece has three times the mass of each other piece. What are the magnitude and direction of its velocity immediately ...
... Problem 9 – 39P*: A vessel at rest explodes, breaking into three pieces. Two pieces, having equal mass, fly off perpendicular to one another with the same speed of 30 m/s. The third piece has three times the mass of each other piece. What are the magnitude and direction of its velocity immediately ...
Gravitation
... 1. Each planet moves in an ellipse which has the sun at one focus. 2. The line joining the sun to the moving planet sweeps out equal areas in equal time. 3. The squares of the times of revolution of the planets about the sun are proportional to the cubes of their mean orbit distance r from it. ...
... 1. Each planet moves in an ellipse which has the sun at one focus. 2. The line joining the sun to the moving planet sweeps out equal areas in equal time. 3. The squares of the times of revolution of the planets about the sun are proportional to the cubes of their mean orbit distance r from it. ...
P3 Quick run-through - crypt
... question. Last year it was a converging lens with object beyond 2f. In June 2012, it was a diverging lens. A question on explaining transformers or another electromagnetic device – possible long answer. Expect long/difficult calculations as there are few equations in P3. Remember workings and units. ...
... question. Last year it was a converging lens with object beyond 2f. In June 2012, it was a diverging lens. A question on explaining transformers or another electromagnetic device – possible long answer. Expect long/difficult calculations as there are few equations in P3. Remember workings and units. ...
NASA Explorer Schools - NSTA Learning Center
... An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force. ...
... An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force. ...
File - DEHS Physics
... • This version of Newton’s second law is only valid when objects have constant mass! • General version of Newton’s Second Law ...
... • This version of Newton’s second law is only valid when objects have constant mass! • General version of Newton’s Second Law ...
Review Sheet
... chapter. Look for the answers to these questions in your book and in your notes. These questions do not necessarily cover everything in the chapter. They just give you an idea of some of the important topics. Write all of your answers on a separate sheet of paper. There will not be enough room for y ...
... chapter. Look for the answers to these questions in your book and in your notes. These questions do not necessarily cover everything in the chapter. They just give you an idea of some of the important topics. Write all of your answers on a separate sheet of paper. There will not be enough room for y ...
Elastic Potential Energy
... it neutral position. It is now released. Neglecting the mass of the spring and assuming that the mass is sliding on a frictionless surface, how fast will the mass move as it passes the neutral position of the spring? (4) A 5.0 g pellet is placed in the barrel of a toy gun and is propelled by a sprin ...
... it neutral position. It is now released. Neglecting the mass of the spring and assuming that the mass is sliding on a frictionless surface, how fast will the mass move as it passes the neutral position of the spring? (4) A 5.0 g pellet is placed in the barrel of a toy gun and is propelled by a sprin ...
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.