Dynamic and Statics Flashcards

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1
Q

Newton’s first law of motion is defined as

A

Inertia, and object in motion will stay in motion and an object at rest will stay at rest if the net outside force is zero

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2
Q

Newton’s second law of motion is defined as

A

Net force= Mass * acceleration

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3
Q

Newton’s third law of motion is defined as

A

An object that acts on another object with Force A will receive an equal and opposite reaction force from that object Force B

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4
Q

What is friction
The equation?

A

Friction is define by mew * normal force where mew is the friction constant
Friction opposes motion

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5
Q

what is static friction

A

It is the friction that is equal to the applied force that keeps the object at rest

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6
Q

What is kinetic friction

A

It is the friction that opposes movement, to calculate it you would use the equation.

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7
Q

What does it mean to be in mechanical equilibrium

A

To be in mechanical equilibrium the net force in the x and y have to be zero and the net rotational force has to be zero

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8
Q

What is the force of gravity on a ramp equivalent to

A

mgsintheta

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9
Q

What is the net force on an object sliding down a ramp with friction? Without friction?

A

friction, -mgsintheta+Friction
Without friction, -mgsintheta

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10
Q

What is the net force on an object sliding up a ramp with friction vs without friction

A

Friction: -mgsintheta-friction
Without: -mgsintheta

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11
Q

What is torque
what direction is torque negative? Positive?

A

Torque is the tendency of a force to cause rotational motion
Clockwise is negative, counter-clockwise is positive

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12
Q

What is the equation for torque

A

T= r F sin theta
T= r F perpendicular

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13
Q

On the left side of a seesaw a block with mass A sits on seat A. The plank of the seesaw is length L and the pivot point length M away from seat A which is closer. (pivot point is closer to seat A). Seat B is length N away from the pivot point.
M<N
How would you solve to problem to find how much mass B must be so that the seesaw is balanced.

A

When it is balance T=0
Set the point of reference at the pivot point
0= -M * MassA(9.8) + N * MassB(9.8)

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14
Q

Apply F= Ma
If an object is moving at a constant velocity, what is the net force? Why is this so?

A

The net force=0
Moving at constant velocity means there is zero acceleration.

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