Gravity
What is gravity?
Gravity is a force that attracts two bodies toward each other, commonly experienced as the force that pulls objects toward the Earth.
What are balanced forces?
Balanced forces are equal in size but opposite in direction, resulting in no change in motion.
What are unbalanced forces?
Unbalanced forces are forces that are not equal and opposite, resulting in a change in the motion of an object.
What is friction?
Friction is a force that opposes the motion of an object in contact with another object.
What is another name for Newtons first law of motion?
The law of inertia.
What is the law of universal gravitation?
What is the law of universal gravitation?The law states that every point mass attracts every other point mass by a force acting along the line intersecting both points.
Give an example of balanced forces in real life.
A book resting on a table has balanced forces acting on it: the weight of the book down and the normal force of the table up.
What is an example of a real life unbalanced forces involving a car?
Pushing a car that is stationary requires unbalanced forces to get it moving.
What types of matter does fluid friction include?
What is Newton's second law?
Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma).
How does mass affect gravitational force?
The gravitational force increases as the mass of either object increases.
How do balanced forces affect motion?
Balanced forces do not cause a change in motion; the object remains at rest or continues moving at a constant velocity.
How do unbalanced forces affect motion?
Unbalanced forces cause an object to accelerate, decelerate, or change direction.
What is static friction?
Static friction is the force that keeps an object at rest and prevents it from moving.
Which law applies to a rocket lifting off?
Newtons 3rd law of motion
What is weight?
Weight is the force exerted by gravity on an object, calculated as mass times the acceleration due to gravity.
What happens to an object in balanced forces?
It remains at rest or moves with constant velocity.
What happens to the direction of an object as an unbalanced force acts on it?
It moves in the direction of the greater force.
Is friction a contact or non-contact force?
Friction is a contact force because it only happens when two objects are touching.
What is inertia?
An object's resistance to any change in its state of motion.
How does distance affect gravity?
The gravitational force decreases as the distance between two objects increases.
What is magnitude and the direction of forces acting on an object with a balanced force?
The forces will be equal in magnitude and opposite in direction.
What happens to the speed of an object when an unbalanced force acts on it?
The speed of the object will either increase or decrease.
How does friction affect motion?
Friction can slow down or stop the motion of an object, depending on the surfaces in contact and the force applied.
What is newtons 3rd law of motion?
For every action there is an equal and opposite reaction.