Question 1
which of the following is an example of a force?
a. electrons moving toward a positive charge
b. a child kicking a soccer ball
c. air pushing against a falling object
d. all of the above
question 2
tension force is an example of a contact force.
a. true
b. false
question 3
a frictional force is the force exerted by a surface as an object moves across it; therefore, it is considered a contact force.
a. true
b. false
question 4
which of the following best describes normal force?
a. the force of attraction between two objects
b. the force applied to an object by a push or a pull
c. the force transmitted through a string, rope, or wire
d. the support force exerted on an object which is in contact with another stable object
question 5
if a leaf falls from a tree and we assume that it is in free fall and not affected by air resistance, how many force vectors does the leaf have?
a. 0
b. 1
c. 2
d. 3
question 6
if you kick a ball and the ball does not move, then the forces involved must
a. unbalanced
b. balanced
c. directional
d. weighted
question 7
as the distance between two objects gets larger, the gravitational force between them gets larger too.
a. true
b. false
question 8
when an astronaut is in space, his or her body is acted upon by an increased gravitational force from the earth.
a. true
b. false
question 9
the mass of an object cannot change, but the weight of an object can change.
a. true
b. false
question 10
use the following image to answer the question.
in the above diagram, the force vectors are equal in magnitude and opposite in direction.
a. true
b. false
(the picture is for number 10)

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) determine the magnitude and direction of projectile velocity at t= 1.3s b) determine the magnitude and direction of projectile acceleration at t=1.3s

Need asap ! what is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

When temperature of a substance increases, of its particles increase resulting in more between particles. real world applications of thermal expansion absolute zero (-273 degrees c) is the lowest possible temperature on the kelvin scale. it is a measure of where a substance has no kinetic energy. heat is a process of the . energy flows spontaneously from a object to a until equilibrium is reached. heat is measured in heat is transferred throughis a method of heat transfer that occurs between particles of matter that are in direct contact with each other. are poor conductors that impede / reduce the rate of heat transfer. is a method of heat transfer that occurs in fluids (non-solids) by means of currents. real world application of convectiona method of heat transfer through electromagnetic waves. when energy moves from one object to another inside a closed system, no energy is or in the system in the transaction. systems will spontaneously move to a state of organized energy or high disorder over time called