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Physics > Forces Quiz > Flashcards

Forces Quiz Flashcards

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1
Q

Force

A

A physical quantity that describes the interaction between bodies. (push or pull)

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2
Q

Are forces vector or scalar quantities?

A

Vector (magnitude and direction)

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3
Q

Do forces ever occur on their own?

A

Never

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4
Q

What is Newton’s Third Law?

A

Every action has an equal and opposite reaction.

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5
Q

What are Field forces?

A

Forces that act at a distance without bodies touching.

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6
Q

What is a gravitational force?

A

-A type of field force
-known as the weight of a body
-symbol is Fg
-every object that has mass experiences it

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6
Q

What is the equation for gravitational force?

A

Fg=mg **g=9.81N/kg

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6
Q

What gravitational forces are occurring as an apple falls?

A

The Earth exerts force on apple. And the Apple exerts force on Earth.

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6
Q

What are normal forces?

A

The contact force that acts on a body that is perpendicular to the surface in contact with the body. (FN)

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7
Q

What is a friction force?

A

A force between two surfaces when in contact. It impedes motion and results in heating. (Ff)

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8
Q

What is the equation for a friction force?

A

Ff=μsFN

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9
Q

What is Newton’s first law? (Law of Inertia)

A

An object at rest or moving with constant velocity continues its behavior unless acted upon by an external force.

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10
Q

What is Newton’s second law?

A

Force is equal to the product of mass and acceleration (F=ma)

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11
Q

What is tension force?

A

Pulling force transmitted axially by means of a string or similar object (FT) (T=mg-ma)

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12
Q

What is the center of mass?

A

The average location of all the mass contained in an object.

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13
Q

What is a free body diagram?

A

A rough diagram of an object that shows the approximate forces acting on each object.

14
Q

What is Net Force?

A

The sum of all forces acting on an object.

15
Q

What is Equilibrium?

A

The state of an object whose net force is zero. (a=0)

16
Q

What is the difference between dynamic and static friction?

A

Dynamic friction (also known as kinetic friction) is the force opposing motion while motion is occurring. Static friction is before motion is occuring.

17
Q

What is μs?

A

The dynamic coefficient for friction. (depends on the materials)

18
Q

What is drag force?

A

A force that opposes motion of bodies through a fluid (gas or liquid)

19
Q

What is buoyancy force?

A

Opposite of drag. Its the upwards force from a fluid (liquid or gas) causing an object to float or sink.

20
Q

What is terminal velocity?

A

The maximum velocity and object can attain as it falls through a fluid. (sum of drag force and buoyant force equals gravitational force)

Physics (6 decks)

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