Newtons Laws

Question 1

Newton’s law of universal gravitation

Answer 1

Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Question 2

Gravitational field (g)

Answer 2

The force acting per unit mass

L(N.kg^-1)

Question 3

Weight (Fg)

Answer 3

The gravitational force the earth exerts on any object on or near its surface

(N)

Question 4

Mass (m)

Answer 4

The amount of matter which an object consists of.

Kg

Question 5

Vector

Answer 5

A physical quantity that has both magnitude and direction

Question 6

Scalar

Answer 6

A physical quantity that has only magnitude.

Question 7

Resultant vector

Answer 7

The single vector which has the same effect as all the original vectors acting together

Question 8

Distance

Answer 8

The length of path travelled

Question 9

Displacement

Answer 9

Change in position

Question 10

Speed

Answer 10

Rate of change of distance

Question 11

Velocity

Answer 11

Rate of displacement

Question 12

Acceleration

Answer 12

Rate of change of velocity

Question 13

Inertia

Answer 13

The property of an object that causes it to resist a change in its state of rest or uniform motion

Question 14

Normal force (FN)

Answer 14

The perpendicular force exerted by a surface on an object in contact with it

Question 15

Frictional force (Ff)

Answer 15

The force that opposes the motion of an object.

Question 16

Tension in a string / cable

Answer 16

The tension in a string / cable is the same throughout the entire string / cable.

Question 17

Newton’s First Law

Answer 17

An object continues in a state of rest or uniform velocity unless it is acted upon by a net or resultant force

Question 18

Newton’s Second Law

Answer 18

When a net force , Fnet is applied to an object of mass , m , it accelerates in the direction of the net force . The acceleration , a , is directly proportional to the net force and inversely proportional to the mass

Question 19

Newton’s Third Law

Answer 19

When object A exerts a force on object B , object B simultaneously exerts an oppositely directed force of equal magnitude on object A.