S3- Chap 4 Dynamics II: Forces

Question 1

What are the effects of a force on the motion of a body (4)

Answer 1

-a body at rest moves
-a moving body increases in speed
-a moving body decreases in speed
-a moving body changes direction

Question 2

What are the scenarios when acceleration is 0?

Answer 2

initial state of motion is
-stationary
-constant velocity

Question 3

what are balanced forces

Answer 3

if resultant force acting on an object is 0, the forces acting on the object are balanced

Question 4

what is Newton’s First Law of Motion

Answer 4

it states that every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it

Question 5

what is inertia

Answer 5

the inertia of an object refers to the reluctance of the object to change its state of rest or motion, due to its mass.

Question 6

what factors effect inertia of an object
how does it affect inertia

Answer 6

-mass
-greater mass, greater inertia
-harder to slow down, start moving, move faster, change direction

Question 7

what is unbalanced forces

Answer 7

if the resultant force acting on an object is not 0, the forces acting on the object are unbalanced.
*take note that object cannot immediately stop

Question 8

what is Newton’s second law of motion

Answer 8

it states that when a resultant force acts on an object of constant mass, the object will accelerate in the direction of the resultant force.

Question 9

what is newton’s third law of motion

Answer 9

it states that if body A exerts a force F on body B, then body B will exert an equal and opposite force F on body A.