Review Unit 3: Work and Energy

Front

What is the definition of work in physics?

Back

Work is done when a force is exerted on an object, and that object moves parallel to the direction of the net force.

Front

What is power in terms of work and energy?

Back

Power is defined as energy used per second, or work done per second.

Front

What is the formula for calculating the braking force required to stop a car?

Back

Front

In a Force vs Distance graph, what does negative work indicate?

Back

Negative work indicates that the force applied is in the opposite direction to the displacement of the object.

Front

How does kinetic energy change when velocity triples?

Back

When velocity triples, kinetic energy increases by 9 times.

Front

What is the formula for calculating work done?

Back

Work done is calculated as Work = Force × Distance × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy; when work is done on an object, energy is transferred to that object.

Front

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

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second.

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

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, calculated as PE = mgh.