WGU C165 Lesson 1-4 quiz with verified answers
A car's engine provides a force of 200 N forward, while a force of 150 N from air
resistance acts to oppose the car's motion. What is the net force and its direction
on the car? Ans✓✓✓-50 N, forward
A cargo spacecraft that brings supplies to the International Space Station (ISS) is
launched using rocket propulsion. The spacecraft's rockets fire hot gases
backward. Which statement is true about this situation according to Newton's
third law? Ans✓✓✓-When the rockets fire hot gases backward, this creates huge
forces in the opposite direction, exerted on the spacecraft by the hot gases.
A driver uses a forklift to push a full cart of bricks halfway down an aisle with a
force of 20 newtons. If the driver pushes an empty cart the rest of the way down
the aisle using the same 20 newtons of force, how does the acceleration of the
empty cart compare with that of the full cart of bricks? Ans✓✓✓-The
acceleration of the empty cart will be more than that of the full cart because it
has less mass.
A graph shows a positive correlation between temperature on the x-axis and total
rainfall amounts on the y axis. Does this indicate that higher temperatures directly
cause the higher rainfall amounts? Ans✓✓✓-The correlation does not necessarily
mean that there is a causal relationship
A moving van worker is trying to move a couch. Due to inertia, what does the
amount of force that needs to be applied to get the couch to start moving across
the room depend on? Ans✓✓✓-The mass of the couch
, A parachute is deployed to slow down a skydiver while descending toward the
ground. What happens while he is descending? Ans✓✓✓-His velocity points
downward and his acceleration points upward.
A recipe calls for 300g of whole wheat flour. What tool would be used to measure
the flour? Ans✓✓✓-Balance
A scientist is studying the speed of water flow in rivers bull this method. Which
type of study would this be classified as? Ans✓✓✓-A field study
An astronaut on board the ISS gently lifts her feet off the floor of the cabin so that
she is not touching any object. At that moment, the ISS rockets start to reboost
and accelerate the ISS forward. What will happen to the astronaut initially?
Ans✓✓✓-To an observer accelerating with the ISS, she will appear to be
accelerating backward.
As a cargo spacecraft lifts off, its booster rockets are employed to accelerate it.
Assume that the booster rockets apply a constant force on the spacecraft. The
higher the spacecraft ascends, the less mass it has because some of its fuel is
burned. What is happening as the spacecraft is ascending? Ans✓✓✓-Both its
speed and acceleration increase.
For which case is there a net force acting on the object? Ans✓✓✓-A rocket
accelerating upward at a rate of 5 m/s2
If net force is zero on a motorcycle traveling at 20 m/s, which statement is true
concerning the motion of the motorcycle? Ans✓✓✓-The motorcycle will
continue traveling at 20 m/s.
A car's engine provides a force of 200 N forward, while a force of 150 N from air
resistance acts to oppose the car's motion. What is the net force and its direction
on the car? Ans✓✓✓-50 N, forward
A cargo spacecraft that brings supplies to the International Space Station (ISS) is
launched using rocket propulsion. The spacecraft's rockets fire hot gases
backward. Which statement is true about this situation according to Newton's
third law? Ans✓✓✓-When the rockets fire hot gases backward, this creates huge
forces in the opposite direction, exerted on the spacecraft by the hot gases.
A driver uses a forklift to push a full cart of bricks halfway down an aisle with a
force of 20 newtons. If the driver pushes an empty cart the rest of the way down
the aisle using the same 20 newtons of force, how does the acceleration of the
empty cart compare with that of the full cart of bricks? Ans✓✓✓-The
acceleration of the empty cart will be more than that of the full cart because it
has less mass.
A graph shows a positive correlation between temperature on the x-axis and total
rainfall amounts on the y axis. Does this indicate that higher temperatures directly
cause the higher rainfall amounts? Ans✓✓✓-The correlation does not necessarily
mean that there is a causal relationship
A moving van worker is trying to move a couch. Due to inertia, what does the
amount of force that needs to be applied to get the couch to start moving across
the room depend on? Ans✓✓✓-The mass of the couch
, A parachute is deployed to slow down a skydiver while descending toward the
ground. What happens while he is descending? Ans✓✓✓-His velocity points
downward and his acceleration points upward.
A recipe calls for 300g of whole wheat flour. What tool would be used to measure
the flour? Ans✓✓✓-Balance
A scientist is studying the speed of water flow in rivers bull this method. Which
type of study would this be classified as? Ans✓✓✓-A field study
An astronaut on board the ISS gently lifts her feet off the floor of the cabin so that
she is not touching any object. At that moment, the ISS rockets start to reboost
and accelerate the ISS forward. What will happen to the astronaut initially?
Ans✓✓✓-To an observer accelerating with the ISS, she will appear to be
accelerating backward.
As a cargo spacecraft lifts off, its booster rockets are employed to accelerate it.
Assume that the booster rockets apply a constant force on the spacecraft. The
higher the spacecraft ascends, the less mass it has because some of its fuel is
burned. What is happening as the spacecraft is ascending? Ans✓✓✓-Both its
speed and acceleration increase.
For which case is there a net force acting on the object? Ans✓✓✓-A rocket
accelerating upward at a rate of 5 m/s2
If net force is zero on a motorcycle traveling at 20 m/s, which statement is true
concerning the motion of the motorcycle? Ans✓✓✓-The motorcycle will
continue traveling at 20 m/s.
