Newton's laws and application of those

Question 1

Normal force

Answer 1

force exerted by a surface on an object in contact with it. Acts perpendicular to a surface irrespective of whether the plane is horizontal or inclined

Question 2

Frictional force

Answer 2

Force that opposes the motion of an object and it acts parallel to the surface the object it is in contact with

Question 3

Newton’s first law of motion

Answer 3

A body will remain in its state of motion (at rest or moving at constant velocity) until a net force acts on it

Question 4

Newton’s second law of motion

Answer 4

When a non-zero net force acts on an object, the object will accelerate in the direction of the net force. Acceleration is directly proportional to the net force and inversely proportional to the mass of the object

Question 5

Newton’s third law of motion

Answer 5

When one body exerts a force on a second body, the second body exerts a force of equal magnitude in the opposite direction of the first body

Question 6

Newton’s law of universal gravitation

Answer 6

Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

Question 7

Weight

Answer 7

Gravitational force the Earth exerts on any object on or near its surface