49 terms

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