49 terms

Science Test Physical Science

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0 net force
no chance in motion
Gravity
The force acting on falling objects
gravity
The force acting on falling objects
It stops accelerating
If the force of gravity and air resistance acting on an object is equal what happens to the object?
From this point forwards it falls at a constant velocity
If the force of gravity and air resistance acting on an object is equal what happens to the object?
They both hit the ground at the same time.
If two objects are released at the same time, one being thrown and the other being dropped which will fall faster?
Force
any push or pull that acts on an object
Force
can affect motion
Force
a vector
Vector
has both magnitude and direction
Newton
amount of force required required to move a 1kg mass to accelerate at 1 m/s
Net Force
The overall force acting on an object after all the forces are combined
Balanced Forces
Forces that combine to produce a new force of zero
Balanced Forces
Has no change in motion
Unbalanced Forces
Results when the net force acting on an object is not equal to zero
Unbalanced Forces
Causes change in motion
Unbalanced Forces
Causes the object to accelerate in the direction of the unknown force
Friction
a force that opposes motion
Friction
occurs between any two surfaces
Static Friction
Acts between objects that are not moving
Sliding Friction
Acts between objects as one moves over the other
Rolling Friction
acts between round objects and the surfaces they are moving over
Rolling Friction
Both the object and the surface are bent slightly out of shape
Fluid Friction
acts on objects moving through fluids
Fluid Friction
Increases as the speed of the object increases
Gravity
A force that acts between any two masses
Gravity
Is an attractive force
Air Resistance
The force that opposes motion as objects move through the air
Air Resistance
Increases as the speed of the object increases
Air Resistance
Increases as the surface area of the object increases
Air Resistance
With a falling object it acts opposite to the force of gravity
Terminal Velocity
the constant velocity of a falling object when gravity is equal to air resistance
Projectile Motion
Motion of a falling object after it is given an initial forward velocity
Projectile Motion
travels both forward and down
Projectile Motion
Follows a curved path
Projectile Motion
Acted upon only by air resistance and gravity
Newtons First Law of Motion
The motion of the object does not change as long as all the forces acting on it are balanced
Inertia
The tendency of an object to resist changes in motion
Newton's Second Law of Motion
if an unbalanced force acts on an object then that object will accelerate in the direction of the unbalanced force
Newtons Second Law of Motion
F=ma
Mass
the amount of matter in an object
Mass
a measure of the amount of inertia
Mass
SI unit kg
Weight
the force of gravity acting on an object
newton
sI unit of weight
Newtons Third Law of Motion
Whenever one exerts a force on another object the second object exerts an equal and opposite force on the first object
Newtons Third Law of Motion
Every force results in an equal and opposite force
Momentum
The product of an object's mass and velocity
Momentum
kg x m/s
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