Honors Physics Additional Review 2024 | Energy, Work, & Power

Front

What is the formula for calculating work?

Back

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

Front

Define kinetic energy.

Back

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

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, commonly gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

How is power defined in physics?

Back

Power is the rate at which work is done or energy is transferred, calculated as Power (P) = Work (W) / Time (t).

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; if work is done by the object, its energy decreases.

Front

If a force of 350 N moves an object 5 m, how much work is done?

Back

Work = 350 N × 5 m = 1750 J.

Front

What happens to the speed of two skaters of different masses at the bottom of a ramp if they start from the same height?

Back

They have the same speed at the bottom of the ramp, as speed depends on the height and not mass.

Front

If Leah pushes an object with twice the force for twice the displacement, how much more work does she do compared to Riley?

Back

Leah does 4 times more work than Riley.

Front

How do you calculate the power of an engine that performs 250,000 J of work in 7.5 s?

Back

Power = Work / Time = 250,000 J / 7.5 s = 33,333 W.

Front

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

Back

The unit of work is the Joule (J).