Forces and Energy

Force(N) has gravitational, frictional. Pressure(N), Force and area of contact, Energy(J),conversion

What is a force?

A force is an interaction that takes place between objects, and can make a stationary object move, stop a moving object, change the speed or direction of a moving object, change the shape and size of an object, or create a turning effect.

What are the SI unit and measuring tool for force?

The SI unit of force is the newton (N) and it can be measured by a force meter or newton meter.

How is speed defined?

Speed is defined as the distance travelled per unit time, commonly measured in metres per second (m/s) or kilometres per hour (km/h).

What role does force play in changing speed?

A force is required to change an object's speed; a larger force will result in a larger change in speed.

What is gravitational force?

Gravitational force is the attractive force that exists between objects that have mass, and is a non-contact force.

How is weight defined in relation to gravitational force?

Weight is the amount of gravitational force acting on an object, calculated by the formula W = mg, where W is weight (N), m is mass (kg), and g is gravitational field strength (N/kg).

What is the difference between mass and weight?

Mass is a measure of the amount of matter in an object and remains constant, while weight is the measure of the gravitational force acting on that mass and can change based on gravitational field strength.

What is pressure?

Pressure is defined as the force applied perpendicular to the surface of an object per unit area, measured in pascals (Pa) or newtons per square metre (N/m²).

What is the formula for work done?

Work done is defined as the product of force and the distance moved in the direction of the force, expressed as Work = F × d.

What is the principle of conservation of energy?

Energy cannot be created nor destroyed; it can only be converted from one form to another, and the total amount of energy in a closed system remains constant.