Forces & Newton's Laws

Weight

________ is the gravitational force exerted by the Earth onto an object.

gravitational field

The ________ is strength greater at the poles than at the equator.

Gravity

________ is a force that operates at a distance and pulls on objects without actually coming into contact with them.

Inertia

________ is an attribute of matter that makes it resistant to changes in motion.

Non

________- contact force: a force that occurs between objects without them touching.

Object motion

________ is unaffected by internal forces.

Mass

________ is the quantity of matter in an object.

Earth

As the ________ is not a perfect sphere, gravity depends on the geographic location of an object.

Acceleration

________ is equal to gravity in the downwards direction.

net force

If the ________ acting on an object is zero, that object maintains its state of rest or constant velocity.

Fnet

________ is the net force.

Masses

________ will always be attracted to Earth when it interacts with the force field.

Friction

________ can be both a good and bad thing.

Kinetic friction acts

________ on any object that is in motion.

Static Friction

________: acts between surfaces at rest but tends to move.

Free Body Diagram

A(n) ________ (FBD) is a drawing of a single object that shows only the forces (as vectors) acting on that object.

Kinetic Friction

________: acts between surfaces moving over each other.

mud particles

The ________ accelerate from rest to some velocity when the leg is pushed downward.

system diagram

A(n) ________ is a sketch of all of the objects involved in a situation.

direction of motion

The force exerted on a moving objects by a surface opposite to the ________.

Air resistance

________ is greater for larger cross- sectional areas than for smaller cross- sectional areas.

pickup truck

When a(n) ________ is moving, you shouldn't stand in the back (bed) of the vehicle.

Contact Force

a force that occurs in between two objects when they touch

Non-contact force

a force that occurs between objects without them touching

example

pushing a box

Value

9.8 m/s^2 [down]

Example

a box at rest

Static Friction

acts between surfaces at rest but tends to move

Kinetic Friction

acts between surfaces moving over each other