Dynamics

Question 1

definition of mass

Answer 1

mass is a measure of an objects resistance to change in state of motion

Question 2

definition of momentum

Answer 2

momentum is the product of an objects mass and its velocity

Question 3

definition of impulse

Answer 3

the impulse of a force is the product of the force and the time of impact of the force (j = Ft)

Question 4

N1L

Answer 4

in the absence of resultant external forces acting on a body, a body will remain at rest and a body in motion will continue to move at a constant velocity

Question 5

N2L

Answer 5

the rate of change in the momentum of a body is proportional to the resultant external force acting on it, and the change in momentum is in the direction of the force

Question 6

N3L

Answer 6

all actions have an equal and opposite reaction

Question 7

principle of conservation of linear momentum

Answer 7

in the absence of external forces, the total momentum of bodies in a system remains constant

Question 8

what constitutes an elastic collision?

Answer 8

total KE before and after are the same

relative speed of approach and separation are the same

Question 9

definition of force

Answer 9

the force exerted on X by Y is defined as the rate of change of momentum of Y produced by X

F = dp/dt = dmv/dt = m dv/dt = ma