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505 Unit Project Energy In Motion

By retrokid298 Apr 25, 2015 804 Words
Describe how the car moved when
you released the end of the straw.
When I released the end of the
straw the car was propelled forward
across the floor.

Explain how the motion of the car after you released
the end of the straw demonstrates
Newton’s three laws of motion.
•Newton’s three laws of motion. Newton’s First Law of Motion states, “Every object continues in a state of rest, or in motion in a straight line at constant speed, unless it is compelled to change that state by an unbalanced force exerted upon it.” The change was the thrust made when the straw was released.

•Newton’s Second Law of Motion states, “The acceleration produced by an unbalanced force on an object is directly proportional to the magnitude of the force, is in the same direction as the force, and is inversely proportional to the mass of the object.” The force of the balloon caused an unbalanced force. •Newton's Third Law of Motion states, "Every action has an equal and opposite reaction". In this experiment, the air escaping through the straw (the thrust that made it go) is the action while the car's propulsion across the room in the opposite direction is the reaction.

Define friction, explain how it influenced your model car, and state where the friction came
from

• Friction: Frictional force is the force exerted by
a surface as an object moves across it. The
frictional force in this experiment is caused by
the wheels scooting across the floor with the
downward force of the wind from the balloon
thrusting it forward.

•Define inertia and describe how your model car demonstrated inertia both before and after you released the end of the straw
•Besides friction, explain at least 3 other forces that were acting on your car when you released the end of the straw. Explain whether those forces were balanced or unbalanced and state why you know this.



Inertia, acceleration, and velocity are 3 other forces that were acting on my car when it was released. The inertia was unbalanced because the Newton’s Law of Motion states that, “Every object continues in a state of rest, or in motion in a straight line at constant speed, unless it is compelled to change that state by an unbalanced force exerted upon it.” The acceleration was unbalanced as well. Newton’s Second Law of Motion states, “The acceleration produced by an unbalanced force on an object is directly proportional to the magnitude of the force, is in the same direction as the force, and is inversely proportional to the mass of the object.”. The velocity was a balanced force. We know that because Newton’s Third Law of Motion states, “Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.”

Explain how your car demonstrated speed,
velocity, and acceleration.
My car demonstrated speed because all objects
in motion travel a certain distance in a given time. That
time taken to travel x amount of distance equates to
speed. Velocity was demonstrated because, the car
traveled in one direction which was caused by the
force applied by the air of the balloon, and the force of
the air pressure of the balloon caused the acceleration
of the car and pushed the car across the floor, causing
friction between the wheels and the floor.

Explain how you can calculate the speed,
velocity, and acceleration of your car
To calculate the speed of an object you use the
formula: speed = distance/time
To calculate the velocity you use the formula: v=d/t
• velocity equals displacement (change in position)
divided by time.
• To calculate acceleration there are a couple of
formulas which are listed below:
• Acceleration = Change in velocity/time interval
• Acceleration = Change in speed /change in time

Propose one way to change the design of your
car to make it move faster.
• One way that I believe that you could increase
the speed of your car is to shape the body of
the car more like an airplane wing so that you
could use the air displacement to make the car
more aerodynamic which will make it run
faster.

Explain how the air in the balloon makes the car
move.
The air pressure of the air coming out of the balloon
pushes the car across the floor. Inertia: The tendency
of a body to stay at rest or in constant motion in a
straight line until some force acts upon it. In short,
inertia is an object’s natural resistance to changes in
motion. Before I released the straw, my car had inertia
because it was waiting for another force to cause
movement. My model car demonstrated inertia when
the force of the air pressure caused car to move after I
released the end of the straw.

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