Does a single external force acting on a particle necessarily change its kinetic energy explain?

Does a single external force acting on a particle necessarily change its kinetic energy explain?

(a) A single external force acting on a particle necessarily changes its momentum and kinetic energy. Single force on a particle may change the magnitude and or direction of velocity, so momentum changes necessarily but kinetic energy may or may not change.

Is it possible that a body could change in momentum without changing in kinetic energy?

No you can’t. The kinetic energy is proportional to the square of the momentum. Without changing the momentum, the kinetic energy will not change as well. On the other hand you can change the momentum by changing its direction in space without changing its magnitude.

Can a single object have kinetic energy but no momentum?

No , if a object has zero momentum then it doesn’t have kinetic energy because kinetic energy is half of linear momentum. where KE is kinetic energy and M is mass and V is velocity of the object.

Can the PE of a body be negative?

The potential energy of a system can be negative because its value is relative to a defined point.

Can you change the momentum of an object without physically changing the object?

The momentum of an object will never change if it is left alone. If the ‘m’ value and the ‘v’ value remain the same, the momentum value will be constant. The momentum of an object, or set of objects (system), remains the same if it is left alone. Within such a system, momentum is said to be conserved.

Can kinetic energy of a system be increased or decreased without applying an external force on the system?

Yes. Let us consider an isolated system of two particles falling towards each other under their mutual gravitational force of attraction. Also, the kinetic energy of the system is increased without applying any external force on it.

Can a single object have momentum?

Since its mass and velocity don’t change, its momentum won’t change either. This is true whatever the object happens to be – momentum must be conserved in any single-object system, as long as no net force acts on the system.

What does it mean if an object has 0 momentum?

An object can have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn’t exist, the velocity should be zero and thus, the object must be at rest.

Does an external force act on System A?

Only external forces affect the motion of a system, according to Newton’s first law. (The internal forces actually cancel, as we shall see in the next section.) You must define the boundaries of the system before you can determine which forces are external.

Is there is no external force acting on the system What is the total momentum of the system after collision?

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.