Work and Energy

Front

What is the formula to calculate work done?

Back

Work (W) = Force (F) × Displacement (d) × cos(θ), where θ is the angle between the force and displacement.

Front

Define work in the context of physics.

Back

Work is defined as the product of the force exerted parallel to the direction of displacement and the distance moved in that direction.

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J).

Front

If a force of 10 N moves an object 5 meters, how much work is done?

Back

Work = Force × Displacement = 10 N × 5 m = 50 J.

Front

What is gravitational potential energy (PE)?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What happens to the potential energy of an object as it falls?

Back

As an object falls, its gravitational potential energy decreases while its kinetic energy increases.

Front

What is kinetic energy (KE)?

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

How does the height of an object affect its potential energy?

Back

The higher the object, the greater its potential energy, as it is directly proportional to height (PE = mgh).

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy. If work is done on an object, its energy increases.

Front

If two objects of equal mass roll down a hill, what can be said about their velocities at the bottom?

Back

They will have the same velocity at the bottom, regardless of the path taken, due to conservation of energy.