Solutions to Physics Questions Medi11002.

SOLUTIONS TO PHYSICS QUESTIONS MEDI11002
Name of student
Institution affiliation
Date
MEDI11002 / Term 1 / 2020

GLOSSARY
Mass - The amount of matter in a substance.
Volume – “The quantity of space occupied by a substance.”
Density – “The mass per unit volume of a substance.”
Solids – “The phase of matter characterised by a definite volume and shape”.
Force – “Refers to a push or pull on an object. It is a vector quantity whose SI unit is
Newtons.”
Net Force – This is the resultant force after combination of all the forces that act on a
substance.1
Acceleration – “The rate of change of velocity”.
“Newton’s second law of motion” – “The acceleration produced by a net force on an object is
directly proportional to the magnitude of the net force, is in the same direction as the net
force, and is inversely proportional to the mass of the object”.
Velocity – “The speed of an object and its direction of motion; a vector quantity”.
D−Density
m−mass
v−volume
v1 −initial velocity
v2−Final velocity
a−acceleration
F−Force
∆ v−change ∈velocity
m1−mass of object 1
m 2−mass of object 2
MEDI11002 / Term 1 / 2020

Question 1 (A)
If two different solids have the same volume, they must also have the same mass.
This statement is false. Different objects have different densities. Density is such that it is
directly proportional to the mass of an object and inversely proportional to its volume.
D= m
v ... ... ... . ... ... ... ... ... Density Equation
m=D × v ... ... ... ... ... ... ... .. Mass Equation
From the density equation, density refers to the mass of an object by its volume. Mass refers
to the quantity of matter in a substance while volume is how much space an object occupies.
From the mass equation, mass is equivalent to the product of density and volume of an object.
The differences in the masses of substances with the same volume is brought about by
differences in densities of the substances.2 Therefore, with this case two solids that have the
same volume may not have the same mass due to varying density of the substances.
Question 1: (B)
Using the equation F=m*a, if m = 3.50Kg and a = 2m/s2, then the product of 3.50 multiplied
by 2 equals 7N
True, the statement is correct. The resultant force that acts on a substance is determined by
the product of the mass of the substance and its acceleration, according to Newton’s second
law of motion. With the increase in the force acting on an object there is a corresponding
increase in the acceleration.3 A substance with a bigger mass needs a force of higher
magnitude for it to move at the same acceleration of an object with relatively small mass.
Therefore, given a mass and the acceleration, the required force to cause such an acceleration
MEDI11002 / Term 1 / 2020