physics quiz (equilibrium, mass/weight, inertia, net force drawings and questions

what is a force?

a push/pull

what is the unit for forces?

newtons (N)

what are the four forces?

tension, gravity, friction, and normal force

what is tension?

_____ is when a spring, rubber band, or rope applies force (anytime a rope is used, tension is involved

what is gravity (weight)?

____ is the force of gravity being pulled down (apart of every object)

what is friction?

when two things rub together (ONLY included when an object is touching something)

what is a normal force?

support of surface (does not occur when object is in air)

what is the equilibrium rule?

the sum of all forces that act as system. Balances to zero only if system does not change state of motion.

What happens when all forces are going down?

free-fall

What happens when there is both an upward and downward force?

they match each other

what is it called when system is at rest?

static equilibrium

what is it called when a system is in motion?

you have dynamic equilibrium and motion will be CONSTANT VELOCITY

what is another name for newtons first law

law of inertia

what is inertia

when an object maintains its velocity unless acted on by an unbalanced force (an object in motion stays in motion; an object at rest stays at rest)

what does inertia depend on?

mass (symbol: m), (unit:kg)

what is mass?

the amount of matter in an object

does the amount of mass in an object change?

no it does not

does the weight of an object change?

yes it does

what is the equation to find weight?

W = mg

What happens if something is going at constant speed and tension is involved

the weight has to = it

When do we know there is air resistance?

If it states that there is or that it is important, for example; wind is involved. (ex: skydiving, jumping off of a cliff)

what are forces?

Interactions, most of these interactions are contact forces.

Does the tension in a rope depend on the length of the rope?

no it does not

does the length of a vector representing rope tension depend on the length of the rope?

no it does not

when balancing net forces and forces are not going in opposite directions, how do we solve that (form 90 degree angle)

use pythagorean theorem

how do we balance net forces if there is more than 2 present?

cancel the opposite numbers out first, then use pythagorean theorem

mass/weight is a measure of the amount of matter in an object and only depends on the number and kind of atoms that compose it.

mass

it can correctly be said that mass/weight is a measure of “laziness” in an object

weight

mass/weight is related to the gravitational force acting on an object.

weight

mass/weight depends on an objects location, whereas mass/weight does not.

weight; mass