Ana Lopez, Luis Pineda, Rosemary Salguero -Gravitational Motion, Rotational Motion, Work, Energy. Flashcards
- What is the definition of work? -Remember
The transfer of energy that occurs when a force is applied through a distance; equal to the product of the system’s displacement and the force applied to the system in the direction of displacement.
- What is the definition of translational kinetic energy? -Remember
The energy of a system is due to the system’s change in position.
- What is rotational motion? -Remember
The motion of an object around a circular path, in a fixed orbit
- What is the definition of gravitational motion? -Remember
The force of attraction that bodies exert on one another as a result of their mass
- What is the definition of the law of conservation of energy? -Remember
States that in a closed, isolated system, energy is not created or destroyed, but rather, is conserved.
- Identify the effort force and the resistance force for the pedal and front gear. -Identify
The chain exerts an effort force on the rear gear, Fchain on gear. This force is equal to the force of the front gear on the chain. That is, F-gear on-chain = Fchain on gear.
- How to Identify the initial kinetic energy of the system. -Identify
kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared
- Identify the law of conservation of energy to find KEf. -Identify
KEf= KEi+GPEi-GPEf
- Identify the conditions of an isolated system. -Identify
A physical system so far removed from other systems that it does not interact with them
- Identify the forces exerted by Earth’s math. -Identify
The gravitational force exerted by Earth’s mass on an object equals the object’s mass times the gravitational field, Fg = mg.
- Calculation question-A powerful motorcycle can accelerate from 0 to 30.0 m/s (about 108 km/h) in 4.20 s. What is the angular acceleration of its 0.320-m-radius wheels?
22.3rad/s^2
12.calculation question-An astronaut is on a new planet. She discovers that if she drops a space rock from 10m above the ground, it has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?
-0.45 m/s^2
13.calculation question-A 20kg box is dropped 13m. How much work was done on the box?
2548J
14.Calculation question- Jerry pushes a 3.2kg box with 1.5N of force. What is the resultant acceleration?
0.47m/s^2
- calculation questions- A 1.12kg book falls off the top of a 2.03m bookshelf. How much work is required to put the book back on the top of the bookshelf, assuming it is lifted with a constant velocity?
22.28J
- understand- A woman pulls a crate up a rough inclined plane at constant speed. Which statement is false?
A. The work done on the object by gravity is zero
B. The gravitational PE of the crate is increasing
C. The work done by the net force acting on the crate is zero
D. The work done on the crate by the normal force is zero
A
- understand- The work done by a centripetal force on an object moving in a circle at constant speed is __________.
zero
- understand- Consider a constant force, given below, that acts on an object as it moves along the path r⃗ , also given below. Calculate the work W done on the object. The units of the force and path are N and m, respectively.
50J
- understand- You are pulling a dolly with special frictionless wheels on a level surface. There is a rope from your hand to the dolly which you are using to pull it with. The rope makes a 60∘ angle with the ground. You are applying 25Newtons of force.
How much work is done on the dolly over a distance of 5meters
62.J
- understand-Two objects of masses 2 kg and 4 kg are moving with the same momentum of 20 kg ms. (a) Will they have some kinetic energy! (b) Will they have same speed?
a. the kinetic energy of both masses is not the same.
b. As the momentum, p=mv, the two objects will not have same speed,
- definition: What is a revolution?
When an object circles an external axis
- Formula: What is the formula to take the Average angular velocity of an object?
It’s the angular displacement divided by the time required to make a rotation.
- Concept: What is earth’s angular velocity?
(2/pi rad) / (24h)(3600s/h) = 1.27 to the 10 negative 5th power (rad/s)
- Definition: What is gravitational force?
Force of attraction between two masses.
- Formula: What is the formula of the Law of Universal gravitation?
F= G(m1)(m2) / r squared
- Formula: What is the formula of Momentum?
p = Mass * Volume
- Definition: What is Momentum?
The strength gained through the development of events.
- Concept: What states Kepler’s first law?
The path of planets are ellipses.
- Concept: What states Kepler’s second law?
An imaginary line from the sun to a planet sweeps out equal areas in equal time intervals.
- Concept: What states Kepler’s third law?
The square of the ratio of the periods of any two planets revolving about the sun is equal to the cube ratio of their average distances from the Sun.
