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 done?

Back

Work (W) is calculated using the formula W = F ⋅ d, where F is the force applied and d is the distance moved in the direction of the force.

Front

Define kinetic energy (KE).

Back

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

Front

What is the relationship between work and kinetic energy?

Back

The work done on an object results in a change in its kinetic energy, as described by the Work-Kinetic Energy Theorem.

Front

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

Back

ΔKE is calculated as ΔKE = KE_final - KE_initial.

Front

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

Back

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

Front

If a force of 6000 N moves an object 120 m, what is the work done?

Back

Work done (W) = Force (F) × Distance (d) = 6000 N × 120 m = 720000 J.

Front

How do you find the work needed to accelerate an object?

Back

The work needed to accelerate an object can be found using the change in kinetic energy: W = ΔKE = KE_final - KE_initial.

Front

What is the formula to find force when mass and acceleration are known?

Back

Force (F) can be calculated using Newton's second law: F = m × a, where m is mass and a is acceleration.

Front

What is the significance of net work in the context of the Work-Energy Theorem?

Back

Net work is significant because it accounts for all forces acting on an object, determining the total change in kinetic energy.