PHSC 1000 Test 2

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true

The acceleration of gravity near the surface of Earth is 9.8 m/s^2.

false

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is the same as the force on the 1-kg book.

zero

A car is moving down a freeway in a straight line at a constant rate of 24.0 m/s for 4.0 s. Its acceleration is

none of these

A constant net force acting on an object that is free to move will produce a constant

false

A hammer drives a nail into a board with a blow of 25,000 N. The reaction force that acts on the hammer during this hit is less than 25,000 N because the nail is driven into the board.

false

A space probe in remote outer space continues moving because the force acting on it is constant.

true

Compared with the mass of a certain object on Earth, the mass of the same object on the moon is identical.

false

If the mass of an object does not change, a constant net force on the object produces constant velocity.

it can be measured with any of the above referents

Velocity is measured with a referent of

3 m/s2

What is the rate of acceleration for a car that reaches a speed of thirty meters per second from rest in ten seconds?

true

When you roll a ball across the floor, it comes to a stop because a force acts on it.

m/s2

Which of the following is a possible unit of acceleration?

the acceleration is in the direction opposite the motion

Which one of the following is true for deceleration?

true

Your mass is the same no matter where you are.

list and newton's laws of motion

law 1: an object at rest will remain at rest unless acted upon by an external, unbalanced force. (car driving on cruise) law 2: F=ma (mass times acceleration)w=mg (mass times gravity) law 3: for every action there is an equal and opposite reaction. (getting pushed on skates)

Velocity

"Eighty miles per hour toward the northeast" is an example of

all of these

An acceleration may result from

zero

An automobile travels due north with a constant speed of 70 mph. All forces considered, the unbalanced force acting on the auto is

Speed

An automobile turning in a circle has a constant

turn signal

An automobile's acceleration cannot be changed by using the

changing

An object that is moving with an acceleration different from zero will always have a(n) ______________ velocity.

towards the center of the circle

An object travels in a circle of radius 10.0 m with a constant speed of 3.0 m/s. What is the direction of its acceleration?

speed

Distance covered per unit of time is called

false

Galileo believed that natural laws could be understood by logic alone.

all of these

If an object moves with constant velocity,

one-fourth as great

If the Moon were positioned twice as far from the Earth as it is now, the gravitational attraction would

the time squared

The distance traveled by a dropped object in free fall is directly proportional to

Inertia

The natural tendency of an object to remain at rest or in motion with a constant velocity is called

act on different objects

The paired forces in Newton's third law

Acceleration

The rate at which an object's velocity changes with time is called its

Displacement

The straight-line distance and direction between two points are, together, called

false

To steadily (constantly) increase the velocity of something requires an increasing force.


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