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Physical Science > Chapter 11 > Flashcards

Chapter 11 Flashcards

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0
Q

Weight is best described as

A

The down force exerted on objects due to gravity

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1
Q

Which of the following is not factor in calculating momentum?

A

Acceleration

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2
Q

Orbital motion is a combination of

A

Forward motion and free fall

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3
Q

The weight of an object can be calculated by multiplying mass by

A

Free-fall acceleration

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4
Q

A tug-of-war that results in one team pulling the other across the line is an example of

A

Unbalanced forces

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5
Q

Which will result in the greatest acceleration?

A

56 N acting on a 1-KG box

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6
Q

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?

A

They would not differ; they would be the same

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7
Q

Which statement about weight is incorrect?

A

An object weighs more on the moon than it weighs on earth

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8
Q

The strongest gravitational force occurs between earth and

A

The moon

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9
Q

How does the total momentum of two objects before a collision compare with the total momentum after the collision?

A

It is the same

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10
Q

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is

A

Newton’s first law of motion

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11
Q

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

A

Newton’s third law

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12
Q

If the net force on an object is zero then the object has

A

Balanced forces

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13
Q

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?

A

The object is experiencing some kind of friction

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14
Q

Which of the following objects exerts a gravitational force?

A

All of these

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15
Q

Increasing which of these conditions results in more gravitational force between two objects?

A

Mass

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16
Q

Which object does not have momentum?

A

A rock by the side of the road

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17
Q

Which of the following equations is correct?

A

W=mg

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18
Q

When the velocity of an object changes, it is acted upon by a

A

Force

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19
Q

The gravitational force between two objects depends on masses of objects and

A

Distance between objects

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20
Q

Which statement illustrates Newton’s first law

A

All of these

21
Q

The tendency of an object at rest to remain at rest is

A

Inertia

22
Q

One newton is the force that can give a mass of 1KG an acceleration of

A

1m/s2

23
Q

An objects momentum is determined by the objects

A

Mass and velocity

24
Q

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

A

The same

25
Q

The law that states that the unbalanced force acting on an object equals the objects mass times it’s acceleration is

A

Newton’s second law of motion

26
Q

Near earths surface,an objects free-fall acceleration increases as it’s

A

None of these

27
Q

Jen a moving bowling ball hits a pin, some of the balls momentum

A

Is transferred to the pin

28
Q

Which of the filling has a momentum of zero?

A

A newspaper lying on a table

29
Q

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?

A

The law of conservation of momentum

30
Q

The law that states that for every action force there is an equal and opposite reaction force is

A

Newton’s third law of motion

31
Q

Which object has the greatest inertia?

A

A bowling ball

32
Q

A seat belt helps you when your car stops suddenly by providing a

A

Unbalanced rearward force

33
Q

Free-fall acceleration near earths surface

A

Is the same for all objects

34
Q

What force causes a skater sliding on the ice to gradually slow down?

A

Friction

35
Q

Astronauts “float” when inside an orbiting spaceship because they are

A

In free fall

36
Q

Which is an example of projectile motion?

A

A dart thrown at a dart board

37
Q

Whenever a force is exerted, another force occurs that is ___ in size,and ___ in direction

A

Equal,opposite

38
Q

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

A

Both cars will stop

39
Q

What is the unbalanced force that slows down a ball rolling across the floor?

A

The force of friction

40
Q

The SI unit of force, named for the scientist who described the relationship between motion and force, is called the

A

Newton

41
Q

If you divide momentum by velocity, the result is the value if the objects

A

Mass

42
Q

Whenever an object is standing still, the value that is/are always zero is/are

A

All of these

43
Q

When an object is in free fall, the only force acting on it is

A

Gravity

44
Q

What happens immediately after a skydiver opens her parachute?

A

Air resistance greatly increases

45
Q

A 10.0 KG dog chasing a rabbit north at 6.0 m/s has a momentum of

A

60.0 KG• m/s north

46
Q

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?

A

Terminal velocity

47
Q

The force exerted in the racket by a hut tennis ball is the

A

Reaction force

48
Q

When objects are moved further apart from each other, the force of gravity

A

Decreases

49
Q

A force of 240.0 N causes an object to accelerate at 3.2 m/s2. What is the mass of the object?

A

75 KG

Physical Science (6 decks)

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