Unit – forced to move – extended response task
Sarah Moslund 10L
Unit – forced to move – extended response task
Sarah Moslund 10L

Part A:
Rowing is a sport where athletes race against each other in boats the sport is done on rivers, on lakes or on the ocean, depending on the type of race and the racing discipline. The goal of rowing is to create enough power, that the boat will travel a long distance, with minimal work. Physics is an important part of rowing. Several rowing terms deal with how the boat will move through the water, by the power of the stroke. Power is the force that drives the boat. The distance travelled is the motion of the boat in the water. The boats are propelled by the reaction forces on the oar blades as they are pushed against the water. When the rower puts pressure on the oar handle it is transferred to the blade and applies pressure on the water, which is the forced that accelerates the boat forward. The rower works in a translational system: applying a force F and moving the handle with linear velocity v, hence producing power P (4.1) | P = F v |

During the drive the center off mass the whole systems moves forward and the center off pressure off the oar goes through the water. The reaction forces on the rowing blade is the sum of the drag and lift forces. Long term performance in rowing is difficult to analyse, and measure because it is significantly affected by weather conditions and differences over the courses. A rowing boat is not a solid body it contains three separate components: 1. The Crew, representing 70-80% of the total mass

2. The cox, representing 20-30% of the total mass
3. Oars representing less than 5%, which will be ignored So that means that there is more resistance in the boat than just the weight of the boat and rower.

The implication of Newton’s first law is that rowers have to apply force to overcome drag and also they have to...

...Newton’s
three laws, when put into simple terms, aren’t confusing concepts. Just remember
that an object is balanced until acted on by a larger force and then is still
balanced when it goes at a constant speed until acted on again by a larger force
that stops it. The second law is Force= mass X acceleration. And the third is
all forces act in pairs, pretty simple right? Just remember this and the
examples and the rest should make more sense.
The three laws of motion explain how an
object will either stay in motion or what makes it move, (law of inertia),
Force= mass X acceleration, and action and reaction.
This essay will basically take the dry basics of the rules and elaborate
and give examples of how they work so you will have a better understanding of
the laws. Including examples of
labs that demonstrate, lets introduce the first law.
Newton’s 1st law of motion
states that an object at rest will stay at rest until acted on by larger force.
Objects in motion will stay in motion until stopped by a larger force. Basically
this is stating that an object will not move if it isn’t affected by an
unbalanced force. It also says that if it starts to move, it will continue
moving in that direction until a larger force stops this. Say you put a
basketball in a swivel chair and start to roll the chair. If you stopped the
chair, the...

...Newton’s I, II, & III Law
Newton’s three laws of motion explain everything that happens to objects in Earth. Anything from kicking a ball to a human being walking is explained by Newton’s three laws of motion. They explain something different of the motion of an object, put together they explain everything. In order they are; Newton’s First Law: The law of inertia; Newton’s Second Law: Thelaw with the concept of acceleration; Newton’s Third Law: The Law of Action & Reaction.
Newton’s 1st law states that any object at rest will remain at rest or if its moving it will remain moving at a constant speed until force is has acted upon it or is exerted on it. For example, a ball will remain at rest until a force acts upon it. Yet, it will keep going at a constant speed unless another force overpowers it. When a force is applied it doesn’t necessarily have to be one force, it can be multiple. Those forces could include gravity, friction, and your own. In order for this law to be applied to an object, it must be in equilibrium. An object is only equilibrium if the vector sum of all forces equals zero. With these forces & objects also experience acceleration explaining the connection with the two laws.
In addition, Newton’s Second Law states that forces acting upon an object go...

...
Newton’s Three Laws of Motion
Sir Isaac Newton first introduced his three laws in 1686. Newton’s Three Laws of Motion not only improved math and science all over the world, but they played a major role in the development of human beings giving us a better understanding of the world in which we live and the laws that each and every one of us follow. Newton’s first law is law of inertia, which is a restatement of Galileo’s idea, an object in rest stays in rest or an object in motion stays in motion unless acted upon by an outside force. Newton’s second law states acceleration is proportional to the magnitude of the net force, is in the same direction, and is inversely proportional to the mass of the object. Newton’s third law, action and reaction, states for every action there is an equal and opposite reaction.
The first of Newton’s three laws is the law of Inertia. The law of inertia is, every object continues in a state of rest, or of motion in a straight line at a constant speed, unless it is compelled to change that state by forces exerted upon it. In short an object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. There are two types of motion; natural motion and violent motion. Natural motion is either straight up or down. Violent motion is...

...segments that all involve Newton’s 3 laws. Let’s go take a look at the first one.
As you just saw in this Polo segment, Newton’s first law is one of the reason this game exists, if you hit the ball with the polo sick the reason for the ball to continue in motion is because of Newton’s First Law, “An object in motion will remain in motion unless an external force acts upon it.” But the reasons behind the ball slowing down is because of the outside forces, those are acting on the ball, causing the ball to slow down.
Let’s go take a look at the next segment.
When driving a car, in this case NASCAR, but any car really, the acceleration of the car is proportional to the force exerted by the tires, and is inversely proportional to the mass of the car. This is because of Newton’s second law, “F=ma; acceleration is proportional to force and inversely proportional to the mass of the accelerated object.”
Let’s go take a look at one more video clip.
This guy here is dribbling a bowling ball just like a basketball, not quite sure what gave him the idea, but
It’s a perfect example of Newton’s third lav. For every action there is an equal and opposite reaction, so
Then the ball collides with the ground, the ground exerts a force on the ball propelling it back in to the air
When you dribble a bowling ball the ball collides with the floor, and then the floor exerts a force on the ball propelling it back into the air. This...

...Moses Ochieng
Newton’s Second Law of Motion
Objective
As you are probably aware from everyday experience, heavier objects require a greater force to move around than lighter ones. Isaac Newton quantified observations like this one into what is probably the most useful expression in all physics: F = M a, otherwise known as Newton’s Law of Motion. Here, F is the net external force acting on mass M, and a is the resulting acceleration.
The primary objective for this lab is to test the conjecture that Newton’s second Law of Motion does apply to actual laboratory measured motions.
Introduction
The interaction between various objects is responsible for a whole variety of phenomena in our inverse. If no interactions existed, our universe would consist of a bunch of objects engaged in motion at constant velocity in accordance to Newton’s first law. We couldn’t even perceive this universe, because our perceptions are due to interactions with the external environment.
Force is a critical physical concept. While we can’t test every possible situation in which force act, we do know that Newton’s second law was based on Newton’s observations that the acceleration of an object experience is directly proportional to the applied force. In equation form this is
F = Ma
Where F is applied force, a is its acceleration, and M is the coefficient relating force and acceleration. M is a...

...Marcus Tung
Friday, October 5, 2012
Lab Report: Newton’s Second Law
Trial: 1
|Mass of cart with sensors (kg) |0.877 kg |
|Regression line for force vs. acceleration data |
|Y= 0.8325x + 0.05480 |
| |Force pulling cart (N) |Acceleration (m/s²) |
|Force closest to 1.0 N |1.006 |1.27 |
|Force closest to -1.0 N |-1.009 |-1.15 |
[pic]
Trial: 2
|Mass of sensors with additional mass (kg) |1.377 kg |
|Regression line for force vs. acceleration data |
|Y= 1.47x + 0.007312 |
| |Force pulling cart (N) |Acceleration (m/s²)...

...Newton’s First Law – The law of inertia
Newton’s first law states that that moving objects tend to keep moving at the same speed and in the same direction or objects at rest will stay at rest unless and unbalanced force acts on it.
One aspect of a car that relates to Newton’s first law is how if a car a car will continue doing what its doing unless an unbalanced force is applied. For example a car parked in a driveway will not drive forward or reverse unless an unbalanced force is applied. When in motion a car travelling at 50m/s will continue travelling at 50m/s unless acted upon by an unbalanced force.
Another aspect of the car that relates to Newton’s first law is the head rests in the car. When you’re in a rear end collision the head rests help to prevent whiplash. Head rests help because when the car behind bumps into the rear of your car it creates an unbalanced force pushing the car forward but because there isn’t an unbalanced force pushing you forward as well, your body stays in the same position causing your body to push against the car seat. With out the head rest your head wouldn’t be supported and could cause serious neck injuries.
Seat belts are another example of Newton’s first law. If you are wearing a seatbelt when a car slows down, the seatbelt acts as an unbalanced force on you and therefore changes your state of motion so you’re the same as the cars. For...

...7.1 Newton’s Law of Universal Gravitation
Newton’s Law of Universal Gravitation states that:
Every particle attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Consider two particles of masses m1 and m2 separated by a distance r. Each will exert a force F on the other, given by
where F : gravitational force between the two particles.
m1, m2 : masses of the two particles.
r : distance between the two particles.
G : constant of universal gravitation.
m1
m2
F
F
r
m1
m2
F
F
r
Figure 1
The two forces form an action-reaction pair and have the following characteristics,
* are equal in magnitude,
* are opposite in direction,
* act on different bodies
* are of the same type (gravitational force).
G is a universal constant called the gravitational constant (or constant of universal gravitation), which has been measured experimentally to be : G = 6.67 x 10-11 N m2 kg-2.
Important points to note about Newton’s Law of Gravitation
1. Newton’s Law of Gravitation is a universal law. It applies everywhere in the universe.
2. Attractive Nature of gravitational force: Note that the particles in this case are always attracted to each other.
3. The gravitational force is a field force that always exists between two point masses...