Further mechanics

Question 1

What is linear momentum?

Answer 1

The linear momentum of a body is defined as the
product of its mass and its velocity

Tip: The “linear” in linear momentum is there to distinguish it from
angular momentum. A body has linear momentum if it is moving
along; it has angular momentum if it is turning.

Question 2

linear momentum is a _________ quantity

Answer 2

vector , Its units are kgms-1 or, equivalently,

Ns

Question 3

what is the equation of momentum

Answer 3

p = m x v

Question 4

Newton’s Second Law

Answer 4

The rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
The resultant force is equal to the rate of change of momentum.

Question 5

Impulse

Answer 5

If we multiply the force acting on an object by the time it is acting for this is called the impulse of a force.

Question 6

Impulse is a _______ quantity

Answer 6

vector and its unit is the kilogram metre per second (kgms-1) or the newton second (Ns).

Question 7

The area under a force – time graph gives us the of the __________ force applied

Answer 7

impulse

Question 8

Conservation of momentum

Answer 8

The principle of conservation of momentum when two objects interact the total momentum remains the same provided no external forces are acting.

Question 9

Elastic and Inelastic Collisions

Answer 9

Elastic collisions are those in which kinetic energy is conserved. You have the same total mount of kinetic energy at the start and end of the collision.

Inelastic collisions are when you do not have the same amount of kinetic energy at the end as you had at the start. Some of the kinetic energy has been dissipated to the surroundings.

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