Work,Power,Energy

Front

What is Work in physics?

Back

Work is defined as the product of force and the distance over which it acts. It is calculated using the formula: Work (W) = Force (F) × Distance (d) and is measured in Joules (J).

Front

What is the formula for calculating Power?

Back

Power is the rate at which work is done or energy is transferred. It is calculated using the formula: Power (P) = Work (W) / Time (t) and is measured in Watts (W).

Front

What is Kinetic Energy (KE)?

Back

Kinetic Energy is the energy an object possesses due to its motion. It is calculated using the formula: KE = 1/2 mv², where m is mass and v is velocity.

Front

What is Gravitational Potential Energy (PEg)?

Back

Gravitational Potential Energy is the energy an object possesses due to its position in a gravitational field. It is calculated using the formula: PEg = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How does doubling the mass and height of an object affect its gravitational potential energy?

Back

If both the mass and height of an object are doubled, the gravitational potential energy becomes four times greater, as PEg is directly proportional to both mass and height.

Front

What is the relationship between Work and Energy?

Back

Work is a means of transferring energy from one system to another. When work is done on an object, energy is transferred to that object.

Front

What is the principle of conservation of energy?

Back

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

If a force of 40N is applied over a distance of 50m, how much work is done?

Back

2000 J (Work = Force × Distance = 40N × 50m).

Front

Which requires more work: walking up stairs or running up stairs?

Back

They require equal work, as work is dependent on the vertical distance moved and the weight of the person, not the speed.

Front

How far must a spring with a spring constant of 4000 N/m be compressed to store 60 J of energy?

Back

0.17 m (Using the formula: PE = 1/2 kx², where k is the spring constant and x is the compression distance).