Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
|
What is force?
|
A push or a pull that acts on an object.
|
|
|
What can force cause on an moving object and an object that is already moving?
|
A force can cause a resting object to move, or it can accelerate a moving object by changing the object's speed or direction.
|
|
|
What is the overall force acting on an object after all the forces are combined?
|
net force
|
|
|
What is the force acting on an object when it is zero?
|
balanced force
|
|
|
What happens when an unbalanced force acts on an object?
|
The object accelerates.
|
|
|
What is friction?
|
A force that opposes the motion of objects that touch as they move past each other.
|
|
|
What are the four main types of friction?
|
1.static
2.sliding 3.rolling 4.fluid |
|
|
What is static friction?
|
the friction that acts on object that is not moving
|
|
|
What is gravity?
|
A force that acts between any two masses.
|
|
|
Where does gravity acts toward?
|
the downward center of the earth
|
|
|
Gravity causes objects to accelerate downwards whereas air resistence acts...
|
in the direction opposite to to the motion and reduces acceleration.
|
|
|
What is terminal velocity?
|
It is the constant velocity of a falling object when the force of air resistence equals the force of gravity.
|
|
|
What is projectile motion?
|
When an object curves downward because of gravity.
|
|
|
What causes the ball to follow a curved path?
|
the combination of an initial forward velocity and the downward vertical forces of gravity causes the ball to follow a curved path
|
|
|
Which newton law is this?
The state of motion of an object does not changes as long as the net forfce acting on an object is zero. |
1st law of motion
|
|
|
what is inertia?
|
the tendency of an object to resist change
|
|
|
what is mass
|
the amount of inertia an object has and depends on the amount of matter
|
|
|
what is newtons second law
|
acceleration=net force/mass
|
|
|
what is weight
|
the force of gravity acting on an object
|
|
|
what is formula for weight
|
weight= mass x valocity
|
|
|
what do forces always exist as?
|
in pairs
|
|
|
what law is this: whenever one object exerts a force on a second object the second object exerts an equal and opposite force on the first object
|
third law
|
|
|
why dont action forces dont cancel out
|
because they are not acting on the same object
|
|
|
what is momentum
|
momentum= mass x velocity
|
|
|
if no net force acts on a system then the total momentum does not change
|
law of conservative of mommentum
|
|
|
what happens in a closed system?
|
the loss of momentum of one object equals the gain in momentum of another object
|
|
|
which two forces can attract and repel
|
electric and magnetic
|
