Chapter 4 - Forces In One Dimension Flashcards

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0
Q

All accelerations are the result of an _________ _____ acting on an object.

A

Unbalanced force.

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1
Q

In physics, a push or pull is called a _____.

A

Force.

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2
Q

The objects or objects of interaction is called the _________.

A

System.

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3
Q

What’s a contact force?

A

A contacts force exists when an object from the external world touches a system, exerting a force on it.

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4
Q

What is a field force? Give an example.

A

Field forces are exerted without contact. An example of that is gravitational, magnetic, … Etc.

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5
Q

What is a free body diagram?

A

It’s a physical representation that shows the forces acting on a system.

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6
Q

What’s a net force?

A

The vector sun of all the forces on an object.

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7
Q

Explain Newton’s first law.

A

An object that is at rest will remain at test, and an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on that object is zero.

  • acceleration = 0
  • Fnet = 0
  • object in equilibrium.
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8
Q

Define inertia. Is it a force?

A

It’s the tendency of an object to resist change in velocity. No it’s not a force. Forces are results of interactions b/w objects; they’re not properties.

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9
Q

When is the object in equilibrium?

A

If the net force on it is zero. An object is in equilibrium if it’s moving a constant velocity, too.

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10
Q

Explain Newton’s second law.

A
A = Fnet/m 
If the object is at rest, it will start moving. If the object is moving with a constant velocity, then it will speed up, slow down, or change direction. 
- object not in equilibrium
- A =/ 0
- Fnet =/ 0
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11
Q

Define weight.

A

It’s the gravitational force experienced by that object. It’s Fg = mg. With g called the gravitational field.

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12
Q

Define drag force.

A

Force exerted by a fluid on an object opposing motion through the fluid.

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13
Q

Define interactive pair.

A

Set of 2 forces that are in opposite directions, have equal magnitude, and act in different objects.

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14
Q

Explain Newton’s third law.

A

All forces come in pairs. The two forces in a pair act on different objects and are equal in strength and opposite in direction.
F A on B = - F B on A

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15
Q

Define tension.

A

A specific name for the force that a string or rope exerts.

16
Q

What’s a normal force.

A

It’s a perpendicular contact force that a surface ever on another surface.