Question

What is force? what is weight? what is speed? what is velocity? what is acceleration? what is ? what is energy? what is power?​

Answer 1

Distance, Velocity, Momentum, Force, Pressure, Work and Energy

Distance, Speed and Acceleration

distance: x is measured in units of m, for meters.

position: ~r, a vector in three dimensions described by a distance and a direction

speed: v =

∆x

∆t

, in units of m

s

velocity: ~v, a vector in three dimensions described by a speed and a direction

x = x◦ + vt, where x◦ is the position at time t = 0.

acceleration: a =

∆v

∆t

, in units of m

s

2

vector acceleration: ~a, a vector in three dimensions described by a distance and a direction

v = v◦ + at, where v◦ is the speed at time t = 0.

x = x◦ + v◦t +

1

2

at2

.

Momentum

momentum: p = mv, where m is the mass in kg, and p is in kg m/s

angular momentum: L = pr, where p is the linear momentum and r is the radius of the circle

along which the object moves.

Force and Pressure

The force exerted on an object is the mass of an object times the acceleration of the object:

F = ma, where m is the mass in kg, and F is in kg m/s2 = Newton.

force due to gravity at the surface of the earth: Fg = mg downward, where g = 9.8 m/s2

is

the acceleration due to gravity at the surface of the earth.

Answer 2

Answer: FORCE - A push or pull are called force . A force is interaction that cause an affected object to be pushed or pulled in a certain direction. Force is a vector quantity.                                        WEIGHT - the weight of an object is measure of the intensity of the force imposed on this object by the local gravitational  field. Here the weight is proportional to the mass.                          SPEED - the rate at which somebody or something moves or travels.                VELOCITY- the velocity of a body is the distance travelled per second by the body in a specified direction.              ACCELERATION - it is the rate of change of velocity with time.                     ENERGY- energy is for capacity for doing work. It may exists in potential, kinetic, thermal, electrical.                        POWER - power is rate of doing work or of transferring heat i.e the amount of energy transfer or convert per unit time.