Motion Flashcards
(30 cards)
How is acceleration calculated (Triangle)?
A = Delta V/t
Delta V = a x t
T = Delta V / a
What is gravity?
Gravity is the force of attraction between two or more objects or substances.
What 2 things does gravity depend on?
The distance between objects and the mass of each object.
What is gravitational acceleration?
Gravitational acceleration is the rate at which gravity causes the velocity of a falling object to change as it falls.
How do you calculate the final speed of a falling object?
Vf = 9.8m/s/s x t
Compare mass and weight.
Mass: Doesn’t change, measured using a balance, grams.
Weight: Changes based on gravity, measured with a scale, Newtons.
What is Air resistance? What does it depend on and when does it increase?
Air resistance is the force of air slowing down a moving object. Air resistance is fluid friction. Air resistance depends on the size and shape of an object. Also, as the speed of an object increases, the force of air resistance will increase.
Terminal velocity definition
The weight of a falling object is equal to the force of air resistance on the object. An object will stop accelerating at terminal velocity and fall at a constant speed. The net force is zero at terminal velocity so there will be no change in motion.
Free fall definition
When gravity is the only force action on a falling object.
Where can a feather and hammer fall at the same rate?
In a vacuum because there would be no air resistance pushing against the object, only gravity.
Projectile motion definition.
When an object has both horizontal and vertical motion.
It doesn’t matter how fast an object is traveling forward, it will still fall in the same amount of time, as if you dropped it.
Newton’s first law of motion?
An object will not change its motion unless acted upon by an unbalanced force.
Inertia definition
An object’s resistance to change its motion. An object not moving will resist moving and an object already moving will resist changing speed or direction.
Inertia depends on…
an objects mass.
Key words/phrases for the 1st law.
Continue in a straight line, unbalanced force, forward/moving, doesn’t move, constant speed.
Newton’s 2nd law of motion?
The acceleration of an object depends on the mass of the object and the force applied on the object.
Key words and phrases for 2nd law.
Relative force, push harder, relative acceleration, move faster/slower.
Equation for Newton’s 2nd law?
F = m x a
How can weight be calculated?
W = m x 9.8 m/s/s
Newton’s 3rd law?
For every action force there is an equal and opposite reaction force.
Key words and phrases for 3rd law?
Forward, backwards, opposite.
Force pair definition.
The two forces between objects or substances that are pushing each other. these forces are always equal in size and opposite in direction.
Momentum definition.
The resistance of an object to STOP moving.
What does momentum depend on?
Mass and velocity.
