Net Forces
When people pull something in completely different directions, we say they are?
Using opposite forces
What occurs when you release an untied balloon, in Newton's opinion?
The balloon will burst with air, propelling it into the air with equal force but in the opposite direction.
What is the importance of universal law of gravitation?
The universal law of gravitation explains many phenomena that were believed to be unconnected
What role does friction play in energy conservation?
Most physical processes, particularly motion, are slowed down by friction, which continuously dissipates energy.
What is kinetic energy?
The energy that an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.
How do you calculate net force?
F= m x a
What is the meaning of Newton's second law?
More mass, more force
How does the force of gravitation between two objects change when the distance between them is reduced to half?
The gravitational force increases four times when the distance between the objects is halved.
What does the term "energy conservation" mean?
The law of conservation of energy states that the total energy in an isolated system never changes.
What is potential energy?
The energy that is stored in an item as a result of its characteristics, position, and external forces.
What is the unit of measure for force?
Newton
What did Sir Issac Newton discover?
1. Three laws of motion
2. Ideas about gravity
3. Ideas about diffraction of light
If the moon attracts the earth, why does the earth not move towards the moon?
Its acceleration towards the moon is far less than the moon's acceleration toward Earth.
What does the term "energy" mean?
Energy is the ability to do work.
What is this the difference between kinetic and potential energy.
Kinetic energy is the energy connected to an object's motion. Potential energy is the energy that an object contains because of its position.
If a net force of 7 N was applied on 400 g object at rest, how long will it take to raise its velocity to 80 m/s.
4.57 s
What is the principal of newtons first law?
An object at rest will remain at rest unless acted upon unbalanced force.
Gravitational force acts on all objects in proportion to their masses. Why the does a heavy object not fall faster than a light object?
Heavy items do not fall quicker than lighter ones because the acceleration caused by gravity is constant throughout the Earth and all objects experience the same acceleration when they fall.
The law of conservation of energy explains that the sum of all energy in an isolated system stays?
Constant
What practical applications does kinetic energy have?
Jogging and walking. riding a bike. When flowing air strikes a windmill's blades, spinning results, which eventually produces energy.
What is an example of net force?
The soccer ball accelerates when you kick it for the first time and continues to accelerate as it slows down to a stop.
Does more force equal more acceleration?
The greater the net force, the greater the acceleration.
Why does an object float or sink when placed on the surface of water?
Flotation is caused by the differential in pressure that the air or fluid in which an object is submerged puts on it.
A two-kilogram ball is dropped from a thirty-meter-tall skyscraper. When the ball is 10 meters above the ground, what is its estimated velocity?
20 m/s
What role does potential energy play in our lives?
Our knowledge of the universe and our place in it depends critically on potential energy.