Physics Midterm 2

1 kg m/s^2

1 N = _____________ kilograms

8 N

A block is dragged without acceleration in a straight line path across a level surface by a force of 8 N. What is the force of friction between the block and the surface?

8000 N

A car has a mass of 2000 kg and accelerates at 4 m/s/s. What is the force exerted on the car?

direction and magnitude

A force is a vector quantity because it has both ___________ and ________________________

2 m/s^2

A jumbo jet has a mass of 160,000 kg. The thrust for each of four engines is 80,000 N. What is the jet's acceleration in meters per second per second when taking off?

it's weight, the same as, 9.8

A rock is thrown vertically into the air. At the very top of its trajectory, the net force on the rock is __________________ which is the __________________________ its weight. ITs acceleration at the very top of its path is ___________ m/s/s

acceleration

Constant mass acted on by constant force produces constant _____________

No

Does constant things acclerate?

directly

Force and acceleration are ______________ proportional

it doubles

If a net force is doubled, what happens to the acceleration

1/2

If the mass of an object were to become twice as much, what would happend to acceleration?

inversely

Mass and acceleration are ___________ proportional.

air resistance

Objects falling through the air experience _________ _____________.

True.

T or F An iron bar has more mass than a feather pillow

True

T or F. A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is half way to the top of its path is 10 N.

False

T or F. A car is moving at a constant velocity. A rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor ahead of the midpoint of the ceiling.

True

T or F. A heavier object experiences more force from air resistance.

False

T or F. Accounting for air resistance, a heavier object will fall more slowly than a lighter object.

True

T or F. An iron bar has more inertia than a feather pillow

False

T or F. An object set in motion, neglecting air resistance and friction, must have a force applied to it to remain in motion.

True

T or F. At the Earth's surface, 1 kg of any material weighs 9.8 N

True

T or F. Mass is not a force

True

T or F. Neglecting friction, a large block of ice and a smal block of ice sliding down an incline together will arrive at the bottom at the same time.

False

T or F. The mass of an object changes depending on where it is located

True

T or F. The weight of an object changes depending on where it is located

False

T or F. Your weight is a measure of your volume

First, Inertia

This chapter has bee on Isaac Newton's __________ Law of motion, also called the Law of ___________.

98.06

10 kg = __________ Newtons

less

A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared to its initial speed is

directly

Acceleration and force are _______________ proportional.

inversely

Acceleration and mass are _____________ proportional.

change

Acceleration means ________________.

air resistance equals the weight of an object

An object reaches terminal velocity when

10 m/s^2

An object released from rest on another planet requires one second to fall a distance of 5 meters. What is the acceleration in meters per second per second due to gravity on this planet?

increases, increases, decreases

As velocity ____________________, air resistance also _____________________, and acceleration _______________

zero

At terminal velocity, acceleration is __________

Acceleration = force / mass

To find acceleration given force and mass, you find acceleratoin by using the formula

Force = mass x acceleration

To find force given mass and acceleration, you find force by using the formula

Mass = force / acceleration

To find mass given force and accleration, you find mass by using the formula

force

Weight is a ______________.

Zero

What is acceleration of an object that has reached its terminal velocity?

zero

What is the net force on an object at rest?

5N

What is the net force on an object being pulled 20 N. northward and 15 N southward?

Stays the same

When an object falls through the air, as velocity increases, acceleration __________

stays the same

When an object falls through the air, as velocityincreases, accleration ___________________

zero accleration

Zero net force means __________ _______________.