Question

1. A car with a mass of 1Mg is at rest at a stoplight. When the light turns green, the car's engine applies a force resulting in a net force of 2kN acting on the car to the east for 10s.

               a) Calculate the acceleration that the car experiences.

               b) Calculate the final velocity of the car at the end of the 10 seconds.

               c) Calculate the initial momentum of the car.

               d) Calculate the final momentum of the car.

               e) Calculate the car’s change in momentum.

2. Fill out the Metric Prefix chart. The first has been done for you as an example.

Prefix	Symbol	Mathematical representation	How many times larger or smaller
Pico-	p	x10-12	Trillion times smaller
Milli-
Mega-
Kilo-
Nano-
Centi-
Giga-
Micro-

3. Fill out the quantity chart.

Definition	Quantity	Unit	Scalar or Vector?
Force through a displacement.
The gravitational force Earth exerts on an object.
Change in position.
The combination of on object’s mass and velocity.
The ability to do work.
Speed and direction.
How fast an object changes how fast it’s going.
The force perpendicular to surface of contact.
The rate at which work is done.
A force parallel to the surface of contact opposing motion.
The amount of matter an object is made of.

Answer 1

mass = 1Mg = 1000 kg

t = 10 sec

F = 2000 N

a) acceleration = force/mass

= 2000/1000

= 2 m/s2

b) v = u +at

v = 0 + (2*10)

v = 20 m/s (final velocity)

c) initial momentum = m u

= kg m/s

d) final momentum = m V

= 1000 * 2 0

= 20000 kgm/s

e) car's change in momentum = 20000 kgm/s

3) quantities which has both magnitude as well as direction are known as vector quantities like force, velocity etc but the quantities which have only magnitude and no direction are known as scalar quantities like mass , speed etc.

using this concept , the following quantities are classified as :

Force through a displacement - scalar quantity
The gravitational force Earth exerts on an object. - vector
Change in position - vector
The combination of on object’s mass and velocity - Vector
The ability to do work - scalar
Speed and direction - vector
How fast an object changes how fast it’s going = vector
The force perpendicular to surface of contact = scalar
The rate at which work is done = scalar
A force parallel to the surface of contact opposing motion = vector
The amount of matter an object is made of - scalar

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