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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
How many forces make up the net force?
However many there are exerted on the object. Usually there is gravity, friction, and another force exerted on the object.
Why do balanced forces always have a net force of 0?
When forces are in equilibrium, the net force is always zero. This is because each and every force in every direction balances out.
For example, a person is hanging by a harness from a rock climbing course. He is stationary (not moving). This means his weight force of 780N is equal to the force the rope and harness has (-780N - due to opposite direction).
780N + -780N = 0N (Hence the net force is zero).
Alternatively, you can use F = ma (Newton's Second Law) to show this problem.
Fnet = ma
= 78kg x 0ms-2
= 0N (hence the net force is zero.
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What type of general energy is based on motion and depends on an objects speed and mass?
kinetic energy
The formula for determining kinetic energy is KE = 1/2mv2, where m is mass in kg, and v is speed in m/s.
Projectiles are basically just objects that move through air along a trajectory without a propulsion system.
A simpler definition is that projectiles are things that move through air along a curved path without anything to push it forward, like a motor. Examples would be like an eraser that you throw at someone.
What are the principles of physics?
Much of physics can be derived from the principle of least action. A more complete answer could fill up several books, so I will just stop here.
http://en.wikipedia.org/wiki/Principle_of_least_action
The most widely used principle: Using an axe.
One of the most important strategy for conquering and solving problems: Divide and Conquer. Divide the problem into individual units and solve the units individually. Finally, piece them up to obtain a complete picture.
One of your resources in doing this is basic differentiation-which divides the problem into parts and integration-summing or piecing up.
If you are moving at 10 knot what is the conversion to miles per hour?
10 Knots = 11.507794 MPH If 1 knot = 1.1507794 mph, then 10 X 1.1507794 = 11.507794
A dimensionless number which is a ratio of kinematics viscosity to thermal?
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
6 x 40 = 240 miles
Kinetic energy is proportional to velocity2, so if velocity is multiplied by four the kinetic energy is multiplied by sixteen
If you have the distance (in miles) in 9 hours, divide the distance by 9.
How is energy and the kinetic theory involved in each of these six processes?
What six processes would be a good comeback question.
Name the processes and one of us will have a stab at it.
What is the impact force of an airsoft bb traveling at 450fps?
Without the weight of the airsoft BB, it is impossible to answer this question as Force is affected by the mass of the projectile.
What is the relationship between forces and energy?
Forces can change the energy of an object by doing work on it or transferring energy to it. Energy can also be stored in an object as potential energy, which can be converted into kinetic energy when forces act on the object. In general, forces are related to changes in energy through the work-energy principle.
Ignore the kinetic friction coefficient, that is only in the problem to trick you. If the force pulling the sled is parallel to the ground, then the problem should be pretty easy. Acceleration due to gravity = 9.8 m/s^2
What is acceleration of a body moving with uniform velocity?
zero because the initial and final velocity is constant .
so,difference bet. final velocity and initial velocity is zero
horizontal component = 915 m/h so 915*2.3=2104 miles horizontally
vertical component = 915 m/h (409m/s)
u=409m/s
t=2.3 s
a= -10 (m/s)/s
s=?
s=ut+(0.5*a*t^2)
s=(409*2.3)+(0.5*-10*2.3*2.3)
s=940.7+-26.45
=914.25 miles vertically
and this time correctly
horizontal component = 915 miles/h = 409meters/s * 2.3 s = 941meters horizontally
vertical component numbers ok but result in meters , not miles ,so
= 914.25 meters vertically
In a distance-time graph the slope of is the ratio of time to distance?
no it's the ratio of distance to time (ie speed)
What would be the skaters speed if all the potential energy could be converted into kinetic energy?
Clearly, that depends on the amount of potential energy. If given the height, calculate the potential energy with the formula for gravitational potential energy (PE = mgh). If mass is not given, you can assume any mass (it doesn't affect the result), or use a variable "m". Then, assuming it gets converted to kinetic energy, use the formula for kinetic energy (KE = (1/2)mv2), replace the KE with the energy you calculated before, and solve for v (the speed).
A skier who has more blank energy than a skier at the bottom?
A skier at the top has more potential energy
What is the fastest a human has kicked a football in mph?
Sporting Lisbon's Brazilian left-back Ronny "Homem-Bomba" (human bomb) Heberson holds the record, with a free kick against Naval that has been measured to be moving at close to 132 mph. Watch it at: http://youtube.com/watch?v=cSzwIBeihXA
