Phy8_Work and Energy Review

Front

What happens to potential energy (PE) and kinetic energy (KE) as a pendulum swings from its highest to lowest position?

Back

The potential energy decreases while the kinetic energy increases.

Front

What is the formula for calculating work done when a force is applied at an angle?

Back

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

Front

If a 2 kg ball is dropped from a height of 10 m, what is its kinetic energy when it reaches the ground?

Back

196 J.

Front

What is the value of cos 180 degrees?

Back

-1.

Front

What is the potential energy of a 3 kg ball that is on the ground?

Back

0 J.

Front

Define 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

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

Back

The unit of work is the Joule (J).

Front

How do you calculate potential energy (PE) of an object at a height?

Back

Potential energy is calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy.

Front

If a force of 30 N is applied at an angle of 60 degrees and moves an object 5 m, what is the work done?

Back

75 J.