Net Forces
Two students pull a rope with 30 N right and 45 N left; what is the vector of the force?
15 N left
This Enlightenment philosopher, most famous for "I think therefore I am," devised the coordinate plane
Rene Descartes
The equation representing an object in equilibrium is this.
When two objects crash into one another and become one mass, it is this type of collision
Inelastic
High and low tides are caused by the gravitational pull of this celestial body on Earth's water.
Moon
With pushes of 20 N and 15 N right and 10 N friction left, the what is the magnitude and direction of the net force
25 N right
This diagram shows all forces acting on an object and their relative magnitudes.
Free-body diagram
Describe the forces on a car not in equilibrium
Forces in one direction are more than the opposing forces
If two students push off one another in rolling chairs, describe the momentum of one as it relates to the other
Equal with an opposite direction
This law states that intensity of an effect is inversely proportional to the square of the distance from the source.
Inverse-square law
When forces are in the same direction, you do this to find net force magnitude.
Add
In diagrams, longer arrows represent this for forces.
Higher force
This occurs when net force is zero and the object is at rest.
Static equilibrium
A 3,500 kg car moving at 20 m/s has this much momentum.
70,000 kg*m/s
When only gravity acts on an object, the object is said to be in this state
Free-fall
This is the combination of all forces acting on an object.
Net force
This type of quantity involves only magnitude, like speed or mass.
Scalar
A balanced rock on a cliff or a plane flying level with equal lift and weight exemplify this state.
Mechanical equilibrium
If two objects bounce off one another, it is this type of collision
Elastic
This force pulls massive objects towards one another
Gravity
This is the SI unit for measuring force.
Newton
This type of quantity involves both magnitude and direction, like velocity.
Vector
This type of equilibrium applies to an object moving at constant velocity with zero net force.
Dynamic equilibrium
When two students on rolling chairs push off, the lighter one moves faster due to this law of momentum
Conservation of momentum
Newton's Law of Universal Gravitation states that force is proportional to the product of masses and inversely proportional to this squared.
Distance