Exploring Motion and Forces
Calculating Speed: Section 1
q The SI unit for distance is meters. q The SI unit for speed is meters per second. q What is the SI unit for time is seconds.
Calculating Speed: Section 2
q When solving for speed, you are looking for meters per second (velocity). q Your speed is 5 meters per second. 100/20 = 5 q You skate faster.
Calculating Speed: Section 3 q When solving for speed, you are looking for meters per second (velocity). q Her average speed was 9.37 meters per second. 200/21.34 = 9.37
Calculating Speed: Section 4 q When solving for time, you are looking to end up with distance over velocity. q If a lightning bolt strikes the ground 1 km away from you, it will take .30 seconds for the sound to reach you. 100/330 = .30
Calculating Speed: Section 5 q If the 60th floor is 219 m above the first floor, it would take the elevator 21.9 seconds to go from the 1st floor to the 60th floor. 219/10 = 21.9
Calculating Speed: Section 6 q It would take 5 hours to finish the race if the river was 130 km and you were traveling downstream. 10 km/hr is added to your speed of 16 km/hr because you are moving downstream. 130/26 = 5 q If you were traveling upstream, it would take 21.6 hours. 10 km/hr is subtracted from your speed of 16 km/hr because you are moving upstream. 130/6 = 21.6
Velocity and Speed: Section 1 q They have the same velocities. q They have the same speeds. q There is no difference between speed and velocity.
Calculating Acceleration: Section 1 q The car’s average acceleration is 3 m/s2. q The average acceleration is positive because the car is gaining speed.
Calculating Acceleration: Section 2 q The roller coaster’s acceleration is 7.3 m/s2.
Calculating Acceleration: Section 3 q The swimmer’s acceleration is .01 m/s2 during this interval.
Calculating Acceleration: Section 4 q The acceleration of the roller coaster is –5 m/s2. q The average acceleration is negative because the roller coaster loses speed.
Putting the Knowledge to Work: Hypothesis Question q You can measure a runner’s speed by calculating distance traveled over time. q Running twice as far would take twice as much time if the runner is moving at a constant speed.
Putting the Knowledge to Work: Data and Observations
Putting the Knowledge to Work: Analysis
Distance (meters) 0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50
Robbie’s Time (short) .95 1.11 .60 .67 .32
Velocity 5.26 m/s 4.50 m/s 8.33 m/s 7.26 m/s 15.63 m/s
Acceleration 5.54 m/s2 -.68 m/s2 6.38 m/s2 -1.60 m/s2 26.16 m/s2
Duran’s Time (short) .42 1.58 .9 .63 .53
Velocity 11.9 m/s 3.16 m/s 5.56 m/s 7.94 m/s 9.43 m/s
Acceleration 28.33 m/s2 -5.53 m/s2 2.67 m/s2 3.45 m/s2 2.8 m/s2
Robbie’s Time (long) .69 1.7 .24 .27 1.23 .78 .53 .81 .50 .39
Velocity 7.25 m/s 2.94 m/s 20.83 m/s 16.52 m/s 4.07 m/s .64 m/s 9.43 m/s 6.17 m/s 10 m/s 12.82 m/s
Acceleration 10.5 m/s2 -2.54 m/s2 74.54 m/s2 -15.9 m/s2 -10.1 m/s2 -4.40 m/s2 16.58m/s2 -4.02 m/s2 7.66 m/s2 7.23 m/s2
Duran’s Time (long) 1.29 .8 .32 .4 1.22 .72 .41 .96 .46 .8
Velocity 3.86 m/s 6.
Men are looked at as brave, selfless people and are perceived as heroes all throughout society. Johnson addresses this point saying, “The idea of heroism, for example, has been appropriated almost entirely by patriarchal manhood. From movies and television to literature to the nightly news, our ideas of who and what is heroic focus almost entirely on men and what they do” (548). Since men have power in this world, they have generated a society that pleases them. Superhero movies are a huge money maker in today’s world. But, the most popular superheroes are exclusively men such as Batman, Superman, Captain America, The Flash and The Hulk. This media only feeds into the ideology that men are the heroes in the world and they are the ones making sacrifices for others. They see a world that appeals to them and do not see a reason to mess with the system. Kilbourne writes, “When power is unequal, when one group is oppressed and discriminated against as a group, when there is a context of systematic and historical oppression, stereotypes and prejudice have different weight and meaning” (499). Men now see patriarchy as natural and how life should be. They can look back at previous generations and see that they succeeded with patriarchy and feel they should do the same. Men see absolutely no reason as to why they should relinquish their position of
the length of the slope can be used to calculate the speed of the car
Firstly, even after government advancement, the integration of a democratic society, and a greatly improved justice system, individuals still feel threatened by police officers. When police training was created, and guidelines/ penalties were and laid out, they were expected to have a large impact on minimizing incidences of excessive police force. Yet, this is not the case. It is often said that prevention is better than cure, this statement can be applied to police brutality by preventing it befor...
When hearing the phrase “police brutality,” many people imagine batons cracking skulls, tasers electrocuting bodies and bullets penetrating innocent teens. While police officers have been known to use violence, police brutality does not occur as often as many believe. In many situations, officers have to act on impulse and curiosity, despite the backlash the media may create.
6. A small stream flowing at a rate of 8 liters per second has a vertical drop of 1.5 m. What is the maximum power that you can obtain from this stream? (1 liter of water has a mass of 1 kg).
The speed of the runner is very easy to determine. It's only stride length times stride frequency, for example if you travel five feet in one stride and you take three strides per second you're speed will be 15 feet per second. Basic math. Although, there are three different types of stride lengths, takeoff, flight, and landing distance. Takeoff distance is the distance that the body's center of mass is ahead of the toe of the front foot at the instant the back foot leaves the ground. The flight distance is the distance that the body's COM travels while the runner is in the air. The landing distance is the distance that the toe of...
Police brutality is a very real problem that many Americans face today. The police carry an enormous burden each day. Police work is very stressful and involves many violent and dangerous situations. In many confrontations the police are put in a position in which they may have to use force to control the situation. There are different levels of force and the situation dictates the level use most of the time. The police have very strict rules about police use force and the manner in which they use it. In this paper I will try to explain the many different reason the police cross the line, and the many different people that this type of behavior effects. There are thousands of reports each year of assaults and ill treatment against officers who use excessive force and violate the human rights of their victims. In some cases the police have injured and even killed people through the use of excessive force and brutal treatment. The use of excessive force is a criminal act and I will try and explore the many different factors involved in these situations.
Police brutality is the considered use of unnecessary force, usually physical, carried out during law enforcement activities with the population. This type of behavior also includes verbal attacks and psychological intimidation by a police officer. Police brutality has an adverse effect on society, and it has lead to critical injury and even death. There are three different was to explain police brutality: the history, the reason, and the solution for it. The history, including the beginning or the first case of police brutality, the different police brutality through the times, and present day police brutality. The reason, including laws for police brutality, the cause of personal emotions or reaction of officers. The solution, involves protests,
Police brutality remains one of the most serious and divisive human rights violations in the United States. The excessive use of force by police officers persists because of overwhelming barriers to accountability. This fact makes it possible for officers who commit human rights violations to escape due punishment and often to repeat their offenses. Police or public officials greet each new report of brutality with denials or explain that the act was an aberration, while the administrative and criminal systems that should deter these abuses by holding officers accountable instead virtually guarantee them impunity (Williams 45).
4.6 seconds is the time to travel the length of a football field if you are go...
In chapter 18, we will apply work and energy method to solve planar motion problems involving force, velocity, and displacement. But first it will be necessary to develop a means of
find the rate I have to find the mass change in 1 hour, and I will
Getting to the river was not a very long or hard task. We lived relatively close, to say the least; it was about five blocks from our houses. It was a little strange while we were traveling to the river, because as time went by, the clouds started coming in. By the time we made it to the river, it was no longer a beautiful, bright sunny day, it was now a cool, colorless day. How could the weather change in such a short amount of time? Good question! When you are young and walking with a bunch of friend’s, you tend to talk fast and walk very, very slow. I believe it must have taken us anywhere between twenty minutes to an hour to get to our destination.
Here, we can use the vectors to use the Pythagorean Theorem, a2 + b2 = c2, to find the speed and angle of the object, which was used in previous equations.