Momentum and Impulse and vertical projectile motion(1D)

Question 1

Momentum (p=mv)

Answer 1

The product of an object’s mass and its velocity.

Question 2

linear momentum

Answer 2

A vector quantity with the same direction as the velocity of the object.

Question 3

Newton’s second law of motion in terms of momentum

Answer 3

The net (or resultant) force acting on an object is equal to the rate of change of momentum of the object in the direction of the net force.

Question 4

Impulse ( Δp = FnetΔt= mΔv)

Answer 4

The product of the resultant/net force acting on an object and the time the net force acts on the object.

Question 5

Principle of conservation of linear momentum (Σpi=Σpf)

Answer 5

The total linear momentum of an isolated system remains constant (is conserved).

Question 6

Explain what is meant by a projectile

Answer 6

An object which has been given an initial velocity and then it moves under the influence of the gravitational force only.

Question 7

Free fall

Answer 7

Motion during which the only force acting on an object is the gravitational force.

Question 8

Explain what is meant by an isolated system

Answer 8

A system on which the net external force is zero. (An isolated system excludes external forces that originate outside the colliding bodies, e.g. friction. Only internal forces, e.g. contact forces between the colliding objects, are considered.)

Question 9

Elastic collision

Answer 9

A collision where the kinetic energy is conserved

Question 10

Inelastic collision

Answer 10

A collision where the kinetic energy is not conserved