Forces and Motion Flashcards
Force is…
any push or pull that causes something to move, change speed or change direction.
The two types of force are…
balanced and unbalanced.
Balanced force occurs when…
two forces are at the same strength but act in opposite direction.
Unbalanced force occurs when…
the force applied is greater in one direction than it is in the other direction.
Gravity is an…
attractive force between all masses.
Newtons universal law of gravity/gravitation states that…
every object in the universe exerts gravitational attraction to all other objects in the universe and that the attraction is directly proportional to the product of their masses.
Force of gravity =…
f = ma (mass times acceleration)
The greater the mass…
the greater the force.
The greater the distance…
the less for force.
Weight is a…
measure of gravitational force between objects.
Force is measured in units called…
newtons (N)
If an object is weightless it is…
free from the effects of gravity.
Sam doing an experiment where she throws an egg off of the roof of her house; as the egg falls it is experiencing…
air resistance, the force of air exerted on a falling object.
When the air resistance equals the force of gravity what is reached?
Terminal velocity.
Terminal velocity is the…
highest velocity that an object will reach as it falls.
Motion is the…
change in position of an object compared to a reference point.
Speed is the…
rate of change in position.
Speed equals…
distance/time
Velocity equals…
speed + direction
Acceleration is the…
rate of change in velocity.
Acceleration equals…
final speed-initial speed/time
The 3 types of acceleration include…
positive acceleration, negative acceleration and turning or changing direction.
Friction is…
a force that opposes or slows down motion.
Static friction…
is a friction on a object that is not moving.
Sliding friction…
is a friction that acts on an object as it slides across another.
Rolling friction…
is a type of friction that is created as one object rolls on another.
Fluid friction…
is a resistance that occurs when an object is moving through fluid or air.
The amount of friction depends on…
the kinds of surfaces and force pressing the forces together.
Friction changes motion into…
heat.
Newtons first law says that…
when an object is at rest it stays at rest hence, when an object is at motion in motion.
Newtons second law states that…
the greater force applied to an object the more the object will accelerate.
Newtons third law states that…
for each action force there is an equal and opposite reaction force.
Momentum is a…
quantity of motion
Momentum is calculated by…
P = m x v (p = momentum, m = mass and v = velocity)
The law of conservation of momentum states that…
the total amount of momentum of a group of objects does not change unless an outside force acts on it.
Time equals…
distance/speed
Distance equals…
speed x time
Final speed equals…
acceleration x time +initial speed
