Forces Flashcards
What is the definition of force?
A force is an interaction that changes the motion of an object.
What is the symbol and measurement for force?
F, Newtons (N)
What is Newton’s First Law?
An object with no net force travels at a constant velocity.
What is Newton’s Second Law?
An object that does have a net force acting on it will accelerate or decelerate.
What is the formula that links net force and acceleration?
Fnet = ma
What is Newton’s Third Law?
For every force, there is an equal and opposite force.
What does Newton’s First Law say about objects that don’t have a net acceleration?
If an object has no net acceleration, its net force is F = ma = m*0 = 0.
An object with no net acceleration has no net force and will remain at rest or maintain a
constant velocity, according to Newton’s first law.
What does Newton’s Second Law of motion say about the force on a ball after that ball is dropped?
When a ball is dropped on earth, it will feel an acceleration downwards equal to g, so the force on the ball will be F = ma = mg.
What does Newton’s Third Law say about the forces on a ball that is stationary and on the ground?
A ball which is stationary and on the ground, will exert a force onto the ground since the ball itself
is experiencing a weight force. The ground will then give an equal and opposite force (the
support force) according to Newton’s third law.
Define gravity.
Gravity is the force that pulls everything with mass straight down.
Define gravity.
What affect does mass have on gravitational force?
The greater the mass (m) of an object, the greater the force of gravity acting on it.
What is gravitational force?
The force that causes masses to accelerate toward the ground.
What is another name for gravitational force?
Weight force.
What is reaction force?
The reaction force is the force that acts back up on the ball that lies on the ground.
