siape of the velocity - time graph for a body moving with:
a) Uniform velocity b) Uniform acceleration
A body starts from rest with a uniform acceleration 2 ms. Find the distance covered by
are one factor on which the magnitude of a non-contact force depends. How does it depend on
stated by you?
Define linear momentum and state its S.I. unit.
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration produced.
Section B (30 Marks)
Answer any three question only.
2. a) While measuring the length of a rod with vernier callipers . figure below shows the position
What is the length of the rod.
MAIN SCALE
12
13
5 10
VERNIER SCALE
h) State three difference between distance and displacement
Answers
Answer:
Definition of Momentum. (+ SI unit)
The product of mass and velocity of a body is called Momentum of that body.
It is denoted by "P"
Its SI unit is "kg m/s"
Explanation
Let
mass of body = m
velocity of body = v
Then
Momentum of body = P = m × v
Numerical:
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration
Data:
Force = F = 15 N
Mass = m = 2 kg
Required:
Acceleration = a = ?
Calculation:
we know that
According to Second law of motion of newton
F = m × a
Putting values we get
15 = 2 × a
Dividing by 2 on both sides we get
a = 15 / 2 = 7.5 m/s²
So
a = 7.5 m/s²
Difference between Distance and Displacement
Distance:
1) It is the length of actual path covered by body between two points.
2) It is denoted by "S"
3) It is the scaler quantity
4) It is measured by following formula
S = v × t Here v is speed
Displacement:
1)
The shortage distance covered by the body from point A towards point B
is called Displacement.
It directed from initial point A to final point B.
2) It is denoted by "D"
3) It is the vector quantity.
4) It can be measure by following formula
D = V x t Here V is velocity