dynamics - newton's laws

Question 1

moving object acted by no resultant force

Answer 1

constant velocity, zero acceleration

Question 2

inertia

Answer 2

refers to the reluctant of an object to start moving if it is stationary in the first instance or the reluctance of the object to stop moving if it is moving in the first instance

Question 3

Newton’s second law

Answer 3

when a non-zero resultant force acts on an object of constant mass, the object will accelerate and move in the direction of the resultant force

Question 4

Newton’s third law

Answer 4

states that for every action of a force there is an equal and opposite reaction

Question 5

explain why a force must be applied to move something with constant velocity

Answer 5

a force is needed to overcome friction so that the resultant force acting on the crate is zero. when the resultant force acting on the crate is zero, an object in motion will continue with uniform velocity in a straight line. (N1L)

Question 6

Newton’s first law

Answer 6

states that every object continues in its state of rest or of constant velocity in a straight line unless a resultant force acts on it to change its state