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MCAT > Mechanics > Flashcards

Mechanics Flashcards

1
Q

Uniform accelerated motion

A

Velocity is changing. Acceleration is constant

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2
Q

For projectile motion, if acceleration is zero throughout flight, what is horizontal velocity?

A

Constant

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3
Q

Newton’s second law

A

Force equals mass times acceleration

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4
Q

Newton’s first law

A

Force must be applied for an object to move

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5
Q

Newton’s third law

A

For every action there is an equal but opposite reaction

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6
Q

If there is no force but object is moving, velocity must be

A

Constant

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7
Q

If masses are different will the action reaction be the same?

A

No

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8
Q

What kind of friction is rolling resistance?

A

Static friction

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9
Q

True or false action reaction pairs work on same objects

A

False

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10
Q

Kinetic friction is always what to velocity?

A

Parallel and opposite

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11
Q

True or false coefficient of static friction is always greater than coefficient of kinetic friction

A

True

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12
Q

For an inclined plane what is the force due to gravity?

A

Mg sin theta

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13
Q

What do pulleys change the direction of?

A

Tension

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14
Q

What is the center of mass?

A

Point where object acts as a single particle

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15
Q

What is center of gravity?

A

Point where total gravitational force on the system can be considered to act

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16
Q

What is uniform circular motion?

A

Object moving in a circular path with its speed held constant

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17
Q

Why is velocity not constant in uniform circular motion?

A

Direction is constantly changing

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18
Q

In uniform circular motion, velocity is always what to its path?

A

Tangent

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19
Q

In UCM, where does acceleration point?

A

Center of circle. Velocity and acceleration are always perpendicular to each other

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20
Q

What provides centripetal force?

A

Gravity and tension force

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21
Q

What is centripetal force?

A

Net force directed toward the center

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22
Q

What dies tangential acceleration change?

A

Speed making the object not in UCM

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23
Q

In tangential acceleration, where does speed start to decrease?

A

As it rises to the top of the circle and opposed to the velocity vector

24
Q

What is torque?

A

Measure of force to make an object spin or rotate

25
Q

What is the fulcrum?

A

The center of turning

26
Q

If there is no torque, what cannot be decreased?

A

Rotational speed

27
Q

When is max torque reached?

A

When the angle equals 90 degrees

28
Q

For torque, clockwise is

A

Positive

29
Q

For torque counterclockwise is

A

Negative

30
Q

If the force acts at the pivot, what is the torque?

A

Zero

31
Q

What is the lever arm perpendicular to in torque?

A

Line of action of force

32
Q

What is work equal to?

A

Work equals distance times force, when force and distance are in the same direction

33
Q

What is the unit for work?

A

Joule

34
Q

What kind of forces always do zero work?

A

Perpendicular

35
Q

When is W= Fdcos used?

A

Force is constant

36
Q

What is power?

A

Measures how fast work gets done

37
Q

What is the unit for power?

A

Watt (Joules/sec)

38
Q

How much is one horsepower?

A

750 watts

39
Q

What is gravitational potential energy?

A

Moving a object higher or lower. It is opposite of work done by gravity

40
Q

Work done by gravity depends mainly on

A

Height

41
Q

If there is less effort force, what must be covered to satisfy work requirements?

A

Larger distance

42
Q

What is mechanical advantage?

A

Resistance force over effort force. Use the factor to find amount of force required without the machine

43
Q

What is resistance force?

A

Force applied if no machine were being used

44
Q

What is efficiency?

A

Degree to which friction and other factors reduce actual work output of machine from its theoretical max

45
Q

What is the equation for efficiency?

A

Work output/ energy output

46
Q

What can you use efficiency for?

A

Figuring out what % of energy is being lost

47
Q

What is impulse?

A

Force X time

48
Q

Momentum changes are

A

Equal but opposite

49
Q

What is equation for linear momentum?

A

P= my

50
Q

Is KE conserved in an elastic collision?

A

Yes

51
Q

Is KE conserved in an inelastic collision?

A

No

52
Q

What is a perfectly inelastic collision?

A

When objects stick together after colliding

53
Q

What does inelastic collisions result in?

A

Max possible loss of KE

54
Q

What is the rate of change for angular momentum?

A

Torque

55
Q

What is rate of change for linear momentum?

A

Force

MCAT (46 decks)

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