Physical Science 1 Ch 3 Homework

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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A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly.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....


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