# Month: June 2018

## What is force in physics ?

What is force? Force can be defined as  agent that causes a body to change its state of rest or make it change its state and direction of its uniform motion when it  come in contact with the body. It can also be describe as external agent when applied to a body changes its state …

## What is friction in physics?

What is friction? Friction can be defined as a force which act at the surface of separation of two bodies in contact, and tend to oppose the motion of one over the other. Or The force resisting the relative motion of solid surface, fluid layers or object sliding against each other Frictional Force The  frictional …

## Physics question and answer on motion

Physics question and answer on motion 1 A car moves from rest with an acceleration of 0.2m/s2. Find the velocity when it has moved a distance of 50m. Answer V2 + u2 = 2aS Where v = ?, u = 0 (because the car started from rest) a = 0.2m/s2, and  = 50m V2  + …

## Thermal expansion question and answer

Thermal expansion: solid or liquid expand when heat is applied to them. The expansion of any material both liquid and solid depend on the nature of the substance. Thermal expansion question and answer 1 Define the followings (a), Linear expansivity, (b). Cubic or expansivity a nd  (c). Superficial expansivity Answer (a) Linear expansity os solid …

## Physics: specific heat capacity questions and answers

specific heat capacity questions and answers 1 Define specific heat capacity and derive the mathematical formula. Answer The specific heat capacity is defined as the quantity of heat required to raise the temperature of a unit mass (1K)  of a body through a degree rise in temperature(1k). The formula of the specific heat capacity. Note …

## Physics: question and answer on elasticity

Physics: question and answer on elasticity and Hooke’s law 1 Elastic wire extended by 1.0cm when a load of 20g hangs from it. What additional load will be required to cause further extension of 2.0cm? Answer 1.0cm = 0.01m.  2.0cm = 0.02m The force exerted by 20g Convert the 20g to kg  and multiple it …

## Physics: Simple machine question and answers

Simple machine question and answer 1 . A machine has a velocity ratio 5 and 80% efficient. What effort should be needed to lift a load of 200N with the aid of the machine? Answer V.R = 5, Efficiency = 80% Effort needed = 50N Read also question and answer on momentum Simple machine question …

## Physics: questions and answers on momentum and gravity

questions  on momentum and gravity 1 t0 5 Momentum and gravity: Give the direction and magnitude of the net force acting on the followings (1)  drop of rain falling down with a constant speed (2) A cork of mass 10g floating on water (3)) A kite held stationary on the sky (4) A can moving …