dynamics

Question 1

state N1L

Answer 1

Every object continues in a state of rest or constant speed in a straight line (or constant velocity)
unless a net force acts on it to change that state.

Question 2

state N2L

Answer 2

The rate of change of momentum of a body is proportional to the net force acting on it, and this
(rate of) change of momentum takes place in the direction of the net force.

Question 3

state N3L

Answer 3

When body A exerts a force on body B, object B exerts a force of the same type that is equal in
magnitude and opposite in direction on object A.

Question 4

define linear momentum

Answer 4

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

Question 5

define impulse

Answer 5

impulse is the product of force and (triangle)time at which it acts

Question 6

define inertia

Answer 6

inertia is the property of a body which resists change in its motion

Question 7

Explain why the object reaches terminal velocity.

Answer 7

Drag force (due to air resistance) increases when speed of object increases.

Hence, the resultant force and acceleration (both in the downward direction) decreases.

Eventually, when the opposing drag force is equal in magnitude to the object’s weight, the acceleration becomes zero and object travels at constant velocity.