Physical Science 1 Ch 3 Homework
pull of the ball's mass on the earth
As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the
the pull of the Earth on the Sun would double & its pull on the Earth would double.
If the sun were twice as massive...
3rd law
"For every action there is an equal and opposite reaction" is a statement of Newton's
6 N
A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
3 m/s
A 4-kg ball has a momentum of 12 kg∙m/s. What is the ball's speed?
1000 N
A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
cannon has more mass than the ball.
A cannon recoils from firing a cannonball. The speed of the cannon's recoil is small because the
magnitude and direction
A force is a vector quantity because it has both
3.0
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second per second?
ratio of force to mass is the same.
A heavy rock and a light rock in free fall have the same acceleration. The reason the heavy rock doesn't have a greater acceleration is that the
momentum
A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill, the heavy truck will have greater
3000 N
A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is actually
400 N
A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is...
an unbalanced force
A mass is accelerated when _______________ acts upon the mass.
the milk carton has inertia
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
both forces are the same
A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?
a single interaction
Action and reaction forces comprise the parts of
arrow's push against the bowstring
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the
halves
An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
5N
An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is
acceleration
If the mass of an object does not change, a constant net force on the object produces constant
apparent weight for you
Inside a freely falling elevator, there would be no
9.95 N
On Earth, the weight of 0.995 kg of candy would be approximately
inertia
One object that has twice as much mass as another object also has twice as much
less than the density of water
Pumice is a volcanic rock that floats. Its density is
the "stickiness" of atoms on their surfaces & how much they are pressed together.
The amount of friction that occurs when two material surfaces slide against each other depends on
the person's body pulling on the earth
The attraction of a person's body toward the Earth is called weight. The reaction to this force is
2nd law
The equation F = ma is a statement of Newton's
gases, liquids, & solids
The resistive force of friction occurs for
momentum
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has greater
at rest, constant speed, & zero acceleration
What is a possible state of an object in the absence of a net force (net force equals zero)?
10 tons
What is the buoyant force acting on a 10-ton ship floating in the ocean?
inertia
What term refers to the tendency of an object to remain at rest or in uniform, straight-line motion?
higher in the water
When a boat sails from fresh water to salt water, the boat will float
remains the same
When an ice cube in a glass of water melts, the water level
is zero
Whenever the net force on an object is zero, its acceleration
both have the same
Which has the greater density, a lake full of water or a cup full of lake water?
a pickup truck speeding along a highway
Which of the following has the largest momentum relative to the Earth?
follow a straight line path
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to
both the same
You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum?
the gravitational attraction between you and the Earth.
Your weight is....