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Physics > Kinetics > Flashcards

Kinetics Flashcards

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1
Q

What is velocity?

A

Both speed and direction.

Speed is only how fast something is travelling

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2
Q

What is the formula for average velocity?

A

Average velocity = distance / time

Av = d/t

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3
Q

What is the formula for acceleration?

A

Final velocity - original velocity / time

A= v - u/t

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4
Q

How do you find out the distance travelled if you know the initial and final velocities?

A

Distance = (initial velocity + final velocity / 2) x time taken

S = u+v/2 x t

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5
Q

How to calculate the final speed of a travelling object?

A

Final speed = initial speed + (acceleration x time taken)

V = u + at

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6
Q

How do you find out the distance travelled if you have an acceleration figure?

A

Distance travelled = (initial velocity x time taken) + 1/2at squared

S= ut + 1/2at squared

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7
Q

How do you find out the final velocity with an acceleration figure?

A

V squared = u squared + 2as

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8
Q

What is Newton’s first law?

A

Law of inertia.

Objects at rest stay in rest and objects in motion stay in motion with the same speed and direction.

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9
Q

What is Newton’s second law?

A

When a force acts on a body the rate of momentum is proportional to the applied force.

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10
Q

What is the formula for weight?

A

Mass x gravity

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11
Q

What is the formula for momentum?

A

Momentum = mass x velocity

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12
Q

What is elastic and inelastic collision?

A

elastic = Kinetic energy is conserved.

Inelastic = kinetic energy is not conserved (kinetic energy lost)

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13
Q

What is the change of momentum known as?

A

Impulse of the force.

Final momentum - initial momentum

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14
Q

What is the formula for impulse?

A

Impulse = force x time

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15
Q

What is Newton’s third law ?

A

Law of motion.

To every action there is an equal and opposite reaction.

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16
Q

What is a vector quantity?

A

Has magnitude and direction.

17
Q

What is centripetal force?

A

Deflects an object from a straight path and forces it to travel in a curved path.

Force equal to centripetal, but acting in opposite direction is centrifugal force.

18
Q

What is the formula for centripetal force?

A

Centripetal force= m x v2 / R

19
Q

How many radians is 1 revolution?

A

2 radians.

20
Q

What’s the formula for angular velocity?

A

Angular distance moved (radians) / time taken (s)

21
Q

What’s the relation between period and frequency?

A

T = 1 / f

f = 1 / T

22
Q

What’s the formula for work done?

A

Work done = force applied x distance moved

23
Q

What three forms can mechanical energy be divided into?

A

Kinetic
Strain
Potential

24
Q

How can the change in potential be calculated?

A

Mass x gravity x height

25
Q

How to work out kinetic energy?

A

1/2 mv squared

26
Q

What is the formula for power?

A

Work done / time taken

Unit is watts(W)

27
Q

What’s the formula for mechanical advantage?

A

Load / effort

28
Q

What’s the formula for efficiency?

A

Work output / work input x 100

Or

mechanical advantage / velocity ratio

29
Q

What is added if the driving gear moves in the same direction as the driven gear?

A

Idler gear

Non-compound

Physics (6 decks)

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