Work-Energy Theorem

Front

What is the Work-Energy Theorem?

Back

The Work-Energy Theorem states that the net work done by the forces acting on an object is equal to the change in its kinetic energy.

Front

What is the formula for calculating work?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What are the units of work?

Back

The unit of work is the Joule (J), which is equivalent to one Newton meter (N·m).

Front

How do you calculate the change in kinetic energy (ΔKE)?

Back

ΔKE = KE_final - KE_initial, where KE = 1/2 mv².

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.

Front

If a 2.0 kg object is lifted to a height of 0.50 m, what is the increase in gravitational potential energy?

Back

PE = mgh = 2.0 kg × 9.81 m/s² × 0.50 m = 9.81 J.

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 or from that object.

Front

What is the significance of the net work done on an object?

Back

The net work done on an object determines its change in kinetic energy, influencing its speed and motion.

Front

How do you calculate the work done when lifting an object?

Back

Work done (W) = Force (weight) × height = mgh.

Front

What is the weight of an object?

Back

Weight is the force exerted by gravity on an object, calculated as Weight (W) = mass (m) × gravitational acceleration (g).