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Physics Tests > Chapters 8-9 > Flashcards

Chapters 8-9 Flashcards

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1
Q

Who wrote Principia?

A

Newton

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2
Q

According to Newton’s law of universal gravitation, what happens to the gravitational force as the distance between two objects increases?

A

Decreases

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3
Q

Which of the following statements is true concerning friction?

A

Has direction opposite to motion

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4
Q

What is the force of kinetic friction if the normal force is 18 lb and the coefficient of kinetic friction is .31?

A

5.6 lb

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5
Q

What is the acceleration of an object with a mass of 10.5 kg if a 12 N force pushes the object horizontally across a surface? Neglect friction.

A

1.1 m/s^2

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6
Q

What force is necessary to make a 52 kg object accelerate at 1.1 m/s2^? Neglect friction.

A

57 N

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7
Q

Of the four fundamental forces, which holds the nucleus together?

A

Strong force

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8
Q

Of the four fundamental forces, which is the weakest?

A

Gravitational force

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9
Q

Of the fundamental forces which is the strongest?

A

Strong force

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10
Q

Of the four fundamental forces, which is the attraction between different masses?

A

Gravitational force

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11
Q

Completion:

A force is any …..?

A

Push or pull

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12
Q

The statement that everybody maintains its present velocity unless the body is acted upon by an external force is known as …..?

A

Inertia

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13
Q

For every action there is always an equal and opposite ……?

A

Reaction

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14
Q

The …… fundamental force can be a force of repulsion.

A

Electromagnetic force

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15
Q

A drawing that shows all of the forces acting on a body is called a(n) ……?

A

Free-body diagram

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16
Q

The force that is equal in magnitude but opposite in direction to the resultant and achieves equilibrium in a system is called the …..?

A

Equilibrant

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17
Q

When an object’s mass is at rest, it is called the object’s ….. mass.

A

Inertial mass

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18
Q

The laws of planetary motion were developed by ……?

A

Kepler

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19
Q

The first accurate value of G was calculated by ……

A

Cavendish

20
Q

A body that is not accelerating is said to be in ….. equilibrium.

A

Translational

21
Q

The process in which we can find the center of mass of an irregularly shaped object is called …..?

A

Multiple suspensions

22
Q

True/False:
According to the (principle of transmissibility) a vector may be applied anywhere along its line of action without changing its effect.

A

True

23
Q

Any object can be balanced on a sharp point positioned precisely beneath the object’s (center of gravity).

A

True

24
Q

A body acts as if all of its mass were concentrated directly at its (center of gravity).

A

True

25
Q

Force is (inversely) proportional to acceleration.

A

Directly

26
Q

Mass is (directly) proportional to acceleration.

A

Inversely

27
Q

A (Newton) is the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

A

True

28
Q

For a typical combination of surfaces u(s) is (larger) in value than u(k).

A

True

29
Q

The force a surface exerts perpendicularly against an object’s weight is called the (normal force).

A

True

30
Q

When given an object’s weight, you can find its mass by (multiplying) its weight by the rate of acceleration due to gravity.

A

Dividing

31
Q

(Forces) always occur in action-reaction pairs.

A

True

32
Q

An object is (stable) if it’s center of mass falls outside its base of support.

A

Unstable

33
Q

The force transmitted along a rope or other connector is called (net force).

A

Tension

34
Q

Equations:

Newton’s second law of motion

A

F=ma

35
Q

Universal law of gravitation

A

M1 • M2
F= G—————
r^2

36
Q

Determines force of static friction

A

F(sf) = (u)s • F(N)

37
Q

Short Answer:

Define friction

A

Friction may be defined as the resistance arising when an object moves through a medium or across a surface.

38
Q

In your own words, state two of the four laws of kinetic friction.

A

2. Kinetic friction is separate from velocity.

39
Q

Name three of the four ways to reduce friction.

A
  1. By reducing the roughness of the surface
  2. By lubricating the surfaces
  3. By using rollers, roller bearings, or ball bearings.
40
Q

Define stable and unstable equilibrium.

A

Stable equilibrium- An object in stable equilibrium is not easily tipped over.

Unstable equilibrium- An object in unstable equilibrium is upset at the slightest disturbance.

41
Q

If a 55 N force is required to move an object that weighs 93 N across a level surface at a constant speed, what is the coefficient of kinetic friction?

A

Do math then

42
Q

How large a mass will 32 N accelerate at the same rate achieved by 13 N acting on 8.3 kg?

A

Set up proportion then

43
Q

If a box weighing 536 N is pulled forward at constant speed by a force of 150. N at an angle of 37.0 degrees with the ground, what normal force does the supporting surface exert on the box?

A

Review ch.9 review problem #6.

44
Q

A box weighing 87 lb is being pulled with a rope that exerts a force of 60. lb at an angle of 15 degrees with the horizontal. If the coefficient of kinetic friction is .35 what is the kinetic friction?

A

Look at ch. 9 review problem # 6

45
Q

Calculate the gravitational force between two masses of 455 kg and 625 kg, that are separated by 0.150 meters.

A

Use formula on card

Physics Tests (11 decks)

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