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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
Is it possible for a book moving at a constant speed to have a change in velocity?
Yes, if an unbalanced force acts on the book, such as friction, which will slow the book down and eventually cause it to stop.
Lowering an object decreases its potential energy?
Yes, when an object is lowered, it loses potential energy and increases kinetic energy as it moves closer to the ground. This is due to the force of gravity acting on the object as it moves to a lower position.
How would you explain the difference between potential and kinetic energy?
Kinetic energy is energy related to movement. The formula is (1/2) mass times velocity squared.
Potential energy is energy of position. The formula for gravitional potential energy is mgh (mass times gravitation times height).
Miles is the imperial unit of measuring distances. Kilometers or meters is the metric unit. 1 mile is 1.6093 km. So to convert km to miles, we divide by 1.6093. The corresponding distance in miles is 13.048
What are the requirements for an object to accelerate?
Velocity must be changing in order for an object to accelerate or decelerate.
When does a roller coaster increase kinetic energy?
A roller coaster increases kinetic energy when it is going downhill, as gravity is pulling it down and accelerating it. The potential energy is converted into kinetic energy as the roller coaster gains speed.
What is the motion that opposes the motion of an object through liquid?
Viscosity opposes the motion of an object through liquid.
True or false Negative acceleration always means that a system is slowing down?
false
A car can have a negative acceleration and be speeding up.
A negative acceleration determines the direction of the acceleration
A car with forward acceleration will speed up in the forward direction
A car moving forward with a negative acceleration will slow down
A car not moving with a negative acceleration will speed up in the backward direction
A car moving backward with a negative acceleration will speed up in the backward direction
How fast is 913 miles per hour in kilometers?
It is not.
913 miles per hour is a measure of speed while kilometres are a measure of distance. To get speed you need a unit of time. The SI unit is a second, so using that as the unit of time,
913 miles per hour is 0.408 kilometres per second.
It is not.
913 miles per hour is a measure of speed while kilometres are a measure of distance. To get speed you need a unit of time. The SI unit is a second, so using that as the unit of time,
913 miles per hour is 0.408 kilometres per second.
It is not.
913 miles per hour is a measure of speed while kilometres are a measure of distance. To get speed you need a unit of time. The SI unit is a second, so using that as the unit of time,
913 miles per hour is 0.408 kilometres per second.
It is not.
913 miles per hour is a measure of speed while kilometres are a measure of distance. To get speed you need a unit of time. The SI unit is a second, so using that as the unit of time,
913 miles per hour is 0.408 kilometres per second.
Does kinetic energy always convert back into gravitational potential energy?
If you stood at the top of a building with a bottle rocket and aimed it straight at the ground and fired it, it's kinetic energy would exceed it's initial gravitational potential energy. It's kinetic energy would equal the acceleration due to gravity plus the energy of the rocket thrust minus any resistance to air as a result of it's shape.
What is the relatonship between the roughness of a surface and the force of friction?
There is no simple relationship. However, the general tendency is that rougher surfaces have a greater coefficient of friction.
How is riding a bike kinetic energy?
The motorcycle's gasoline is potential energy. The energy is released as a chemical reaction (chemical energy) and converted to heat (heat energy). It then becomes converted to kinetic energy with the movement in the engine, and subsequent movement of the motorcycle.
There's no such thing as "a balanced force".
A GROUP of two or more forces is balanced if the
vector sum of all the forces in the group is zero.
If you are at rest do you have momentum?
The momentum of a body is defined as the product of is mas and velocity. Momentum = Mass x Velocity. If a body is at rest then obviously its velocity is zero. Therefore, its momentum also becomes zero.
How do you find time with only distance and acceleration when Vi and VF are 0?
The amount of time it would take an object to travel a distance with constant acceleration depends on its initial velocity, according to the equation: d = vit + 0.5at2 Where d is displacement, vi is initial velocity, t is time, and a is acceleration. Note: if the object starts from rest, its initial velocity, logically, is zero.
