An object with a changing speed will have a changing momentum.Ī.The forward moving object will have the greatest momentum. Like all vector quantities, the momentum of an object is not fully described until the direction of the momentum is identified. Momentum, like other vector quantities, is subject to the rules of vector operations.ī. FALSE - The Joule is the unit of work and energy. The kg m/s is the standard unit of momentum.Ĭ. FALSE - An object has momentum if it is moving. When that inertia is in motion, the object has momentum.ĭ. However, one should be quick to note that the object does not have to have a constant speed in order to have momentum.Į. FALSE - The direction of an object's momentum vector is in the direction that the object is moving. If an object is traveling eastward, then it has an eastward momentum. If the object is slowing down, its momentum is still eastward. Only its acceleration would be westward.į. FALSE - To say that momentum is a conserved quantity is to say that if a system of objects can be considered to be isolated from the impact of net external forces, then the total momentum of that system is conserved. In the absence of external forces, the total momentum of a system is not altered by a collision.

However, the momentum of an individual object is altered as momentum is transferred between colliding objects. TRUE - Momentum is calculated as the product of mass and velocity. As the speed of an object increases, so does its velocity. TRUE - For the same speed (and thus velocity), a more massive object has a greater product of mass and velocity it therefore has more momentum.Īs a result, an increasing speed leads to an increasing momentum - a direct relationship. FALSE - A less massive object would have a greater momentum owing to a velocity which is greater than that of the more massive object. Momentum depends upon two quantities * mass and velocity. FALSE - When comparing the size of two momentum vectors, the direction is insignificant. The direction of any vector would never enter into a size comparison. TRUE - Objects with a changing speed also have a changing velocity. Object A has more momentum than object B.If an object does not have momentum, then it definitely does not have mechanical energy either.If an object has momentum, then it must also have mechanical energy.Which of the following are true about the relationship between momentum end energy? As such, an object with a changing speed also has a changing momentum.Ģ. Two objects of varying mass have the same momentum.Therefore, object A will also have more kinetic energy. The least massive of the two objects will have the greatest kinetic energy.Ī. Momentum is momentum and energy is energy. Momentum is NOT a form of energy it is simply a quantity which proves to be useful in the analysis of situations involving forces and impulses.ī. TRUE - If an object has momentum, then it is moving. If it is moving, then it has kinetic energy. And if an object has kinetic energy, then it definitely has mechanical energy.Ĭ. FALSE - If an object does NOT have momentum, then it definitely does NOT have kinetic energy. However, it could have some potential energy and thus have mechanical energy.ĭ.

FALSE - Consider Object A with a mass of 10 kg and a velocity of 3 m/s. And consider Object B with a mass of 2 kg and a velocity of 10 m/s. However, Object B has the greatest kinetic energy.

The kinetic energy of A is 45 J and the kinetic energy of B is 100 J.Į. TRUE - When comparing the momentum of two objects to each other, one must consider both mass and velocity both are of equal importance when determining the momentum value of an object.

Impulsive force models