 Physics
Energy
Kinematics

# Relationship between kinetic and potential and mechanical energy?

The relationship is that mechanical energy is the sum of kinetic energy plus potential energy.

Think of a brick sitting on the edge of a table. The brick has potential energy proportional to the mass of the brick and the height of the table:

E = m g h where m = mass, g = gravitational acceleration, h = height

If the brick falls off the edge, it will begin to accelerate at g, the rate of gravitational acceleration (9.8 m/s2). If v is the velocity of the brick, it has kinetic energy proportional to the quare of the velocity:

E = (m v2)/2

Just before the brick finally hits the floor, all of its potential engergy has been converted to kinetic energy. During the moment of impact, that kinetic energy is converted to noise and vibration.

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Kinematics

# A compact car with a mass of 725 kg is moving at 30 ms what is its momentum?

Momentum is the product of mass and velocity, so just multiply both values
IF THE UNITS ARE APPROPRIATE.:

725 kg X 30 m/s = 21,750 kg-m/s.

(If the mass of the car were 725 slugs and it was moving at 30 miles per hour,
then you could not just multiply those numbers.)

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Physics
Energy
Kinematics

# What is a potential vs. kinetic energy graph supposed to look like?

Assuming that no energy gets converted to/from other types of energy, only between potential and kinetic energy, then every time the potential energy goes up, the kinetic energy goes down - and vice versa. The exact details of HOW the graph goes up and down vary, depending on the situation, but the two curves are related as explained.

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Math and Arithmetic
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How To

# How to find initial velocity when given final velocity acceleration and distance traveled?

D=vt+1/2(at^2)
Where
D=Distance
v=Initial Velocity
a=Acceleration
t=Time
Except we do not know the time t. Use v2 = u2 - 2aD. u is final velocity.

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Science
Kinematics

# Levers and Fulcrums. if 100 kg is the weight to be lifted using a rod with the fulcrum 100cm from the object. how much force is required where the effort is 100 cm from that fulcrum?

You would need 100 kg, or 980 N.

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Math and Arithmetic
Physics
Kinematics

# Why is the area under graph of force against time is used to find impulse?

Because impulse is the integral of the force over the time during which it was applied. Graphically, this is the area under the curve of force against time.

Force is rate of change of momentum. Even if you hit a brick wall you impart momentum to some of the atoms in it. The area under a graph of force against time is mathematically speaking the integral of the force with respect to time, as stated above. So it is the integral of the rate of change of momentum. But the integral of a rate of change of anything, is simply the total change. In this case, the total change of momentum. For a large force applied for a very small time, that is called (defined to be) an impulse, and it results in a change of momentum. Strictly it doesn't have to be a small time for this to be true, but impulses are generally imagined as being short time events.

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Kinematics

# Is km s a vector quantity?

km/s can be either a vector or a scalar quantity. It is a unit of speed, which is scalar, but if this speed is in a specific direction, thereby becoming velocity, it is vector.

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Kinematics

# What is the velocity time graph of a stationary object?

A straight line that coincides with the time axis, i.e., its value is zero at any time.

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Motorcycles
Units of Measure
Kinematics
ATVs

# How fast is 140 mph in km for a ATV?

140 mph = 225.3 kph

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Kinematics

# How are momentum and kinetic energy similar?

Both depend on velocity; both depend on mass.

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Kinematics

# How much is 218 kph in mph?

218 kph = 136.25mph

A body is moving at 218 kilometers per hour.

To find out how many miles will it move in the same amount of time, we will need to convert killometers into miles.

1 km = 1.6 miles

therefore 218 km = 218/1.6 miles = 136.25 miles.

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Kinematics
DIY Projects

# How fast is 90km per hour in miles per hour?

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Math and Arithmetic
Physics
Kinematics

# What relationship exists between height and potential energy if mass is held constant?

Potential energy is directly proportional to height.

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Physics
Chemistry
Kinematics

# How kinetic energy of the constituent particles of any matter is affected by a change in temperature?

As temperature is increased the kinetic energy of the constituent particles of matter increases.When temperature decreases the kinetic energy of them decreases.

This is because temperature, or rather heat, is itself energy

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Math and Arithmetic
Algebra
Kinematics

# If a car is going 40 mph how many feet per second is it going?

40 Miles per Hour = 58.666666666666664 Feet per Second

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Physics
Energy
Kinematics

# How convert kinetic energy into electrical energy at home?

There are flashlights where you push with your hand, and a dynamo produces an electrical current. In general, a dynamo can do what you ask for. But usually the proposition is not very practical. Where would you get the kinetic energy from?

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Comparisons

# Comparison between elastic and inelastic collision?

Elastic collison => Momentum and kinetic energy of colliding bodies are conserved.

Colliding bodies should be perfectly elastic and they regain their previous configuration after collison is over.

InElastic collison => Momentum is conserved but kinetic energy of colliding bodies are not conserved. Colliding bodies are not perfectly elastic. Their shape and size(configuration) changes after the collison.

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Kinematics

# How many knots is 4 mph?

3.47590496 knots = 4 mph

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Physics
Energy
Kinematics

# Characteristics of Kinetic Energy?

Motion and heat are the characteristics of energy.

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Physics
Kinematics

# To see if an object is moving you must have?

A stationary frame of reference.

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Math and Arithmetic
Algebra
Kinematics

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Kinematics

# Will doubling velocity double kinetic energy?

Doubling of Kinetic Energy means, K.E. = 2 x 1/2mv2 = mv2.

So, if the velocity is doubled, then K.E. = 1/2m(2v)2 = 1/2 x 4mv2 = 2mv2 ,which means K.E. has increased 4 times .

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Science
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Kinematics

# How can a parked bus potential energy change to kinetic energy?

When the bus starts moving its potential energy will change to kinetic energy.

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Kinematics

# A concrete dam holds back a large reservoir of wateris this potential or kinetic energy?

That is potential energy. The energy of position. PE = mass * gravitational force * height. If the dam burst then the water would be moving and have kinetic energy.

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Kinematics

# What is mach 0.925?

Mach 0.925 = 314.76825 m / s OR 702 MPH

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