Sofia Rodas, Jose Jui, Carlos Pineda - Gravitational Motion, Rotational Motion, Work, Energy. Flashcards
Remember: Gravitational Motion:
What is the definition of gravity?
A force that pulls two objects towards each other.
Remember: Rotational Motion:
What is the definition of rotational motion?
It is an object’s motion around a circular path, in a fixed orbit
Remember: Work:
What is the definition of work?
It is the energy transferred from one object to another by an external force along a displacement.
Remember: Energy:
What is the definition of energy?
It is the work that a force can do.
Remember: Gravitational Motion:
What is the definition of motion?
An object’s change in position over time.
Identify: Rotational Motion:
What are the units of acceleration in rational motion?
rad/s^2
Identify: Work:
What is the formula of work? What is its SI unit?
Formula: W=Fs
SI Unit: J (joules)
Identify: Energy:
What is the formula for Kinetic Energy (KE)?
KE= 1/2mv^2
Identify: Gravitational Motion:
What is the formula of gravitational motion?
Fg=(Gm1m2)/(r^2)
Identify: Rotational Motion:
What is the unit of displacement?
radians (rad)
Calculation: Work: A person pulls a block 4 m along a horizontal surface with a constant force F = 30 N. Determine the work done by the force F acting on the block.
W = F d cos θ = (30)(4)(cos 0) = (30)(4)(1) = 120 Joules.
Calculation: Energy: An object of mass 6 kg is brought to a height of 8 m from the ground g = 15ms. Find the potential energy stored in the object.
The potential energy is = 6815 = 720J. Equation: U =mgh.
Calculation: Gravitational Motion: An object is dropped, with no initial velocity, onto the surface of the planet Neptune and falls 15.5 meters in 5 seconds. What is the acceleration of the falling object?
Acceleration of the falling object: 215.5/5^2= 1.23m/s^2. Equation: a = 2d/t^2.
Calculation: Rotation Motion: What is the moment of inertia of a sphere?
The moment of inertia of a sphere is: I = (⅖ )MR2
Calculation: Work: A body falls from a height of 8 m. If acceleration due to gravity is 20 m/s^2, determine the work done by the force of gravity.
W = F d cos θ = (20)(8)(cos 0) = (1)(8)(20)= 160 Joules
Understand: Energy: Based on all the flashcards and your understanding, what is energy?
Energy is the capacity to move an object by the application of force. Energy can exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another.
Understand: Gravitational Motion: Based on all the flashcards and your understanding, what is Gravitational Motion?
Gravitational Motion is the force of attraction that bodies exert on one another as a result of their mass.
Understand: Rotational Motion: Based on all the flashcards and your understanding, what is Rotational Motion?
Rotational motion is the description of relationships between the angle of rotation, angular velocity, angular acceleration, and time.
Understand: Work: Based on all the flashcards and your understanding, what is Work?
Work is the product of the component of the force in the direction of the displacement and the magnitude.
Understand: Energy:
Gravitational Motion:
Provide an example of gravitational motion:
The force that causes a ball that you through in the air to come down again.
Rotational Motion:
Provide an example of rotational motion:
The motion of wheels, gears, motors, etc. For example, the motion of a Ferris wheel an amusement park.
Work:
Provide an example of work:
Pushing a box horizontally from rest.
Energy:
Provide an example of energy:
Energy exists in many different forms. Examples of these are: potential energy, kinetic energy, light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, and nuclear energy.
Gravitational Motion:
Does the strength of the gravitational motion change base on different effects?
Yes, as the strength of the gravitational motion can be different based on different effects like a different gravitational force.
Rotational Motion:
Can rotational force affect objects that are not circular in nature?
Yes, as an object just needs to move in a circular manner, they don’t necessarily need to be a circular object.
Work:
Can work affect an object by moving it vertically?
No, work is only when an object is moved from rest horizontally.
Energy:
Can energy be created? Can energy be destroyed?
No, energy can only be transformed into other energy types.
Gravitational Motion:
Can gravitational motion exist in areas in zero gravity?
No, as there needs to be gravity in order for it to be considered gravitational motion.
Rotational Motion:
Can rotational motion work in other shapes that aren’t circular?
No, the objects need to move in a circular motion, because objects can’t move around a fixed point that isn’t in a circular motion.
