Chapter 11 Flashcards
Weight is best described as
The down force exerted on objects due to gravity
Which of the following is not factor in calculating momentum?
Acceleration
Orbital motion is a combination of
Forward motion and free fall
The weight of an object can be calculated by multiplying mass by
Free-fall acceleration
A tug-of-war that results in one team pulling the other across the line is an example of
Unbalanced forces
Which will result in the greatest acceleration?
56 N acting on a 1-KG box
In the absence of air resistance,how would the acceleration of a 1.5 KG book the acceleration of a 15 KG rock differ if the objects were dropped from the same height?
They would not differ; they would be the same
Which statement about weight is incorrect?
An object weighs more on the moon than it weighs on earth
The strongest gravitational force occurs between earth and
The moon
How does the total momentum of two objects before a collision compare with the total momentum after the collision?
It is the same
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
Newton’s first law of motion
Earth pulls on the moon and holds the moon in its orbit. The moon pulls on earth with an equal and opposite force. This is an example of
Newton’s third law
If the net force on an object is zero then the object has
Balanced forces
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusions can be drawn?
The object is experiencing some kind of friction
Which of the following objects exerts a gravitational force?
All of these
Increasing which of these conditions results in more gravitational force between two objects?
Mass
Which object does not have momentum?
A rock by the side of the road
Which of the following equations is correct?
W=mg
When the velocity of an object changes, it is acted upon by a
Force
The gravitational force between two objects depends on masses of objects and
Distance between objects
Which statement illustrates Newton’s first law
All of these
The tendency of an object at rest to remain at rest is
Inertia
One newton is the force that can give a mass of 1KG an acceleration of
1m/s2
An objects momentum is determined by the objects
Mass and velocity
If an equal force is applied to two cars of equal mass, car A and car B, car A will have _________ acceleration as car B
The same
The law that states that the unbalanced force acting on an object equals the objects mass times it’s acceleration is
Newton’s second law of motion
Near earths surface,an objects free-fall acceleration increases as it’s
None of these
Jen a moving bowling ball hits a pin, some of the balls momentum
Is transferred to the pin
Which of the filling has a momentum of zero?
A newspaper lying on a table
If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision?
The law of conservation of momentum
The law that states that for every action force there is an equal and opposite reaction force is
Newton’s third law of motion
Which object has the greatest inertia?
A bowling ball
A seat belt helps you when your car stops suddenly by providing a
Unbalanced rearward force
Free-fall acceleration near earths surface
Is the same for all objects
What force causes a skater sliding on the ice to gradually slow down?
Friction
Astronauts “float” when inside an orbiting spaceship because they are
In free fall
Which is an example of projectile motion?
A dart thrown at a dart board
Whenever a force is exerted, another force occurs that is ___ in size,and ___ in direction
Equal,opposite
Two identical cars are traveling with equal speeds. One is going north and the other south. They collide head-on and stick together. How will the cars react after the collision
Both cars will stop
What is the unbalanced force that slows down a ball rolling across the floor?
The force of friction
The SI unit of force, named for the scientist who described the relationship between motion and force, is called the
Newton
If you divide momentum by velocity, the result is the value if the objects
Mass
Whenever an object is standing still, the value that is/are always zero is/are
All of these
When an object is in free fall, the only force acting on it is
Gravity
What happens immediately after a skydiver opens her parachute?
Air resistance greatly increases
A 10.0 KG dog chasing a rabbit north at 6.0 m/s has a momentum of
60.0 KG• m/s north
When gravitational forces and air resistance equalize on an object that is falling toward earth and the object stops accelerating, what is the velocity if an object called?
Terminal velocity
The force exerted in the racket by a hut tennis ball is the
Reaction force
When objects are moved further apart from each other, the force of gravity
Decreases
A force of 240.0 N causes an object to accelerate at 3.2 m/s2. What is the mass of the object?
75 KG
