Text
... causes of motion, Newton introduced two new concepts that were not needed in our study of kinematics. These two new concepts are called mass and force. Although these words are in common use in the English language, in physics, these words have very specific meanings. We will need to be very careful ...
... causes of motion, Newton introduced two new concepts that were not needed in our study of kinematics. These two new concepts are called mass and force. Although these words are in common use in the English language, in physics, these words have very specific meanings. We will need to be very careful ...
Work and Kinetic Energy - University of Utah Physics
... Use a picture to get the sign (look at directions) In this example the spring does negative work since F and ∆x are in opposite direction. The axes don’t matter. ...
... Use a picture to get the sign (look at directions) In this example the spring does negative work since F and ∆x are in opposite direction. The axes don’t matter. ...
Lab3_Force_Table
... Introduction: Vectors are central to modeling forces and their effect on the motion of objects. Using force tables you will be able to add vectors “experimentally”. Then you will add those same vectors graphically and using the component method as discussed in class. Do the results convince you that ...
... Introduction: Vectors are central to modeling forces and their effect on the motion of objects. Using force tables you will be able to add vectors “experimentally”. Then you will add those same vectors graphically and using the component method as discussed in class. Do the results convince you that ...
Ch 9 Rotation
... magnitude of the torque. Torque is actually a vector quantity. We assume the direction to always be to the plane of contact. In this chapter, our objects will rotate in strictly the x-y, or y-z, or x-z plane, thus the direction of our torque, which is always to the plane of rotation for the circ ...
... magnitude of the torque. Torque is actually a vector quantity. We assume the direction to always be to the plane of contact. In this chapter, our objects will rotate in strictly the x-y, or y-z, or x-z plane, thus the direction of our torque, which is always to the plane of rotation for the circ ...
C_Energy Notes PGP
... Problem: How much work does an applied force do when it stretches a nonlinear spring where the force varies according to the expressions F = (300 N/m) x – (25 N/m2) x2 from its equilibrium length to 20 cm? ...
... Problem: How much work does an applied force do when it stretches a nonlinear spring where the force varies according to the expressions F = (300 N/m) x – (25 N/m2) x2 from its equilibrium length to 20 cm? ...
Forces - Storming Robots
... What is a force? A force is an interaction between any two objects. Forces can be the result of direct contact, such as pushing a shopping cart through a grocery store or pulling on a rope during tug-of-war. A force can also act at a a distance, such as gravity. Forces cause acceleration in an objec ...
... What is a force? A force is an interaction between any two objects. Forces can be the result of direct contact, such as pushing a shopping cart through a grocery store or pulling on a rope during tug-of-war. A force can also act at a a distance, such as gravity. Forces cause acceleration in an objec ...
Centripetal Force
... F = ma, so force is proportional to acceleration. If the truck is going faster, or if its radius is smaller, then it is changing direction more quickly, so its acceleration is greater. The greater the speed, and the smaller the radius, the larger the centripetal force needed to maintain circular mot ...
... F = ma, so force is proportional to acceleration. If the truck is going faster, or if its radius is smaller, then it is changing direction more quickly, so its acceleration is greater. The greater the speed, and the smaller the radius, the larger the centripetal force needed to maintain circular mot ...
Chapter 6: Newton`s third law of motion – action and
... 3.) Suppose a friend who hears about Newton’s Third Law of Motion says that you can’t move a football by kicking it because the reaction force by the kicked ball would be equal and opposite to you kicking force. The net force would be zero, so no matter how hard you kick, the ball won’t move. What d ...
... 3.) Suppose a friend who hears about Newton’s Third Law of Motion says that you can’t move a football by kicking it because the reaction force by the kicked ball would be equal and opposite to you kicking force. The net force would be zero, so no matter how hard you kick, the ball won’t move. What d ...
Document
... a) Many Possible Experiments. For example, students could decide to pull with the same force on various air gliders of different masses with spring scales to determine if the acceleration depends on 1/m. b) The best experiment should create the best chance of disproving the relationship a = ΣF/m c) ...
... a) Many Possible Experiments. For example, students could decide to pull with the same force on various air gliders of different masses with spring scales to determine if the acceleration depends on 1/m. b) The best experiment should create the best chance of disproving the relationship a = ΣF/m c) ...
connection
... The Physics of Jumps Gravitational force depends on mass: • More massive → greater gravitational pull • Mass is to gravity like electric charge is to electrostatics. In electrostatics: the larger the electric charge something has, the greater the force it feels in an electric field. ...
... The Physics of Jumps Gravitational force depends on mass: • More massive → greater gravitational pull • Mass is to gravity like electric charge is to electrostatics. In electrostatics: the larger the electric charge something has, the greater the force it feels in an electric field. ...
File
... The momentum of an object depends on mass and velocity. Momentum is how hard it is to stop an object that is moving. Momentum is a (vector/scalar) quantity. vector – it has magnitude and direction Write a sentence that uses the word “momentum” that demonstrates that you know the meaning of the word. ...
... The momentum of an object depends on mass and velocity. Momentum is how hard it is to stop an object that is moving. Momentum is a (vector/scalar) quantity. vector – it has magnitude and direction Write a sentence that uses the word “momentum” that demonstrates that you know the meaning of the word. ...
(linear) momentum
... must lie on an axis of symmetry. The centre of mass is different from its centre of gravity. Each portion of a system is acted on by the gravitational force. The net effect of all of these forces is equivalent to the effect of a single force Mg acting at a special point called the center of gravity. ...
... must lie on an axis of symmetry. The centre of mass is different from its centre of gravity. Each portion of a system is acted on by the gravitational force. The net effect of all of these forces is equivalent to the effect of a single force Mg acting at a special point called the center of gravity. ...
Tutorial 01 (Chapter 01) 3. • The speed of light in a vacuum is
... Washington. It measures approximately 631 m long, 707 yards wide and 110 ft high. What is its volume in cubic feet? (b) Convert your result from part (a) to cubic meters. 24. • An electronic advertising sign repeats a message every 7 seconds, day and night, for a week. How many times did the message ...
... Washington. It measures approximately 631 m long, 707 yards wide and 110 ft high. What is its volume in cubic feet? (b) Convert your result from part (a) to cubic meters. 24. • An electronic advertising sign repeats a message every 7 seconds, day and night, for a week. How many times did the message ...
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.