Galileo's principle, later incorporated into Newton's laws of motion, can be summarized as: "The natural condition for a moving object is to come to rest" or "The natural condition for a moving object is to remain in motion."
One of Galileo's fundamental contributions to physics was the principle of inertia, which later became an integral part of Newton's laws of motion. The principle states that an object in motion will continue to move at a constant velocity unless acted upon by an external force. This concept challenges the common belief during Galileo's time that objects required a force to keep them in motion. In other words, the natural tendency of a moving object is to maintain its state of motion or rest, which implies that an external force is necessary to alter its motion or bring it to rest. Newton expanded upon this principle by formulating his first law of motion, also known as the law of inertia, which states that an object's acceleration is inversely proportional to its mass. This law affirms that the greater an object's mass, the more force is required to change its state of motion or bring it to rest. Therefore, the principle initially stated by Galileo can be expressed as "The natural condition for a moving object is to come to rest" or "The natural condition for a moving object is to remain in motion."
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hadleyhanna702
18 hours ago
Physics
High School
answered
Finally: Create your own problem, show your math work solving for it, and compare Force acting upon a
mass(kg) given two different speeds(time in seconds) in which a collision takes place:
Pick a mass in
kilograms
Pick a Velocity in
meters per second to
decelerate from
Calculate initial
momentum of the
object
Pick a fast
deceleration
Pick a slower
deceleration
What Force acts on
the mass in the faster
deceleration? (Show
your work and include
correct final units)
What Force acts on
the mass in the slower
daralaration? (Show
E.g. I have a mass of about 82.0kg, a
new popular cell phone has a mass of
0.204kg.
E.g. I'm going 55m/h which equals 24.6
m/s
P=mv
P=82kg x 24.6 m/s
P=2020 kg*m/s
E.g. I'm NOT wearing my seatbelt and I
crash into a wall coming to 0 m/s in just
0.20 seconds
E.g. I am wearing my seatbelt and my
velocity changes over 0.91 seconds.
Fet=P-Pâ/t
F=(0 kg*m/s-2020 kg*m/s)/0.2s
F=-2020 kg*m/s +0.20s
Force =-10,000 Newtons (or
kg*m/s)
Fret=Pr-Pâ/t
F=(0 kg*m/s-2020 kg*m/s)/0.91s
C-30306/001
The force acting upon a mass in a collision depends on the mass, velocity, and deceleration involved.
What is the force acting on the mass in the faster deceleration?To calculate the force acting on the mass, we need to use the equation F = (P - P₀) / t, where F is the force, P is the initial momentum, P₀ is the final momentum, and t is the time taken for the deceleration.
Let's assume the mass of the object is 10 kg. We'll pick a velocity of 20 m/s to decelerate from.
Calculate initial momentum:
P = m * v
P = 10 kg * 20 m/s
P = 200 kg·m/s
Pick a fast deceleration:
Let's assume the object comes to rest in 2 seconds.
Calculate the force:
F = (P - P₀) / t
F = (200 kg·m/s - 0 kg·m/s) / 2 s
F = 100 kg·m/s²
F = 100 N
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An electron moves along the trajectory from i to f as shown. Does the electric potential energy increase, decrease or stay the same? Explain. Is the electron's speed at f greater than, less than or equal to its speed at i? Explain.
The electric potential energy decreases and the electron's speed at f is greater than its speed at i.
The electric potential energy of a charged particle is given by the equation U = qV, where U is the potential energy, q is the charge of the particle, and V is the electric potential. In this case, as the electron moves along the trajectory from i to f, the electric potential decreases. This means that the electric potential energy of the electron decreases as well.
To further explain, electric potential is a measure of the electric potential energy per unit charge at a given point in space. When the electric potential decreases, it means that the amount of electric potential energy per unit charge is decreasing. As a result, the electric potential energy of the electron decreases as it moves along the trajectory.
Regarding the speed of the electron, we can apply the conservation of mechanical energy. As the electric potential energy decreases, the total mechanical energy of the electron remains constant. The total mechanical energy is the sum of the kinetic energy and the potential energy. Since the potential energy decreases, the kinetic energy must increase to maintain the constant total mechanical energy.
This increase in kinetic energy corresponds to an increase in the electron's speed at f compared to its speed at i. Therefore, the electron's speed at f is greater than its speed at i.
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Which of the following factors does NOT influence wind speed and direction? a. Friction b. Pressure gradient c. Coriolis effect d. High to low pressure difference e. Radiation QUESTION 4 According to the book, how do pressure gradients usually develop? a. Differences in outgoing longwave radiation b. Winds blowing waves across the ocean c. Unequal heating of the atmosphere d. Winds blowing sand across the landscape e. Seismic waves produced by earthquakes QUESTION 5 Which of the following best describes how a sea breeze works? a. Wind blows from sea to land because warm land has low pressure and cooler sea has higher pressure b. Wind blows from land to sea because wind blows down from higher elevation c. Wind blows parallel to the coastline because of the Coriolis effect d. Wind blows from land to the sea because it is darker e. Wind blows from sea to land because there is more flat distance over which wind can blow in the ocean QUESTION 6 Based on the Coriolis effect, how are winds changed from flow driven by the pressure gradient in the northern hemisphere? a. Winds bend to the right b. Winds speed up c. Winds bend to the left d. Winds bend upward e. Winds slow down QUESTION 7 In which direction does the frictional force work? a. in the same direction as the pressure gradient, causing it to speed up b.to the left of the pressure gradient c. opposite the pressure gradient, slowing it down d.to the right of the pressure gradient e. opposite the motion of the wind, slowing it down
The factor that does NOT influence wind speed and direction is radiation. Hence, the correct option is (e). The factor that does NOT influence wind speed and direction is radiation.
The other four factors that influence wind speed and direction are friction, pressure gradient, Coriolis effect, and high-to-low pressure difference.
Pressure gradients usually develop due to unequal heating of the atmosphere. Hence, the correct option is (c). Pressure gradients usually develop due to unequal heating of the atmosphere.
Pressure gradients occur due to differences in air temperature, which cause pressure differences. Areas with warmer air will have lower pressure while those with cooler air will have higher pressure.
The wind blows from the sea to land because warm land has low pressure and cooler sea has higher pressure is the best description of how a sea breeze works. Hence, the correct option is (a).
A sea breeze is a type of local wind that blows from the sea towards the land. This occurs because during the day, the land heats up faster than the sea, causing the air above it to rise.
This creates a low-pressure area above the land. At the same time, the sea remains cooler, and the air above it is denser, creating a high-pressure area. The air flows from the high-pressure area (the sea) to the low-pressure area (the land), creating a sea breeze.
This breeze usually occurs in the afternoon when the temperature difference between the land and sea is greatest. It helps to cool down the land and bring moisture from the sea to the land.
The sea breeze is a result of differences in air temperature and pressure between the land and sea, with the wind flowing from high to low pressure, bringing moisture to the land and cooling it down.
Winds are bent to the right from the flow driven by the pressure gradient in the northern hemisphere, based on the Coriolis effect. Hence, the correct option is .
Based on the Coriolis effect, winds are bent to the right from the flow driven by the pressure gradient in the northern hemisphere. The Coriolis effect occurs due to the Earth's rotation, causing moving objects such as wind to deflect to the right in the northern hemisphere and to the left in the southern hemisphere.
The frictional force works opposite the motion of the wind, slowing it down. Hence, the correct option is (e). The frictional force works opposite the motion of the wind, slowing it down.
Friction occurs when the wind blows over the surface of the Earth, causing drag and slowing down the wind. The frictional force works opposite to the direction of the wind, with the greatest friction near the surface and decreases with height.
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