Unit 5: Test Review-Work, Power, Energy

Front

What is the formula for calculating kinetic energy?

Back

The formula for kinetic energy (KE) is: KE = \frac{1}{2}mv^2, 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). 1 Joule is equal to 1 Newton meter (1 J = 1 N·m).

Front

What is the relationship between work, force, and distance?

Back

Work (W) is defined as the product of force (F) and the distance (d) moved in the direction of the force: W = Fd.

Front

What is the principle of conservation of mechanical energy?

Back

The principle states that in a closed system, the total mechanical energy (potential + kinetic) remains constant if only conservative forces are acting.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its gravitational potential energy (U_g) decreases while its kinetic energy (KE) increases, keeping total mechanical energy constant.

Front

How do you calculate gravitational force between two masses?

Back

The gravitational force (F) between two masses (m1 and m2) separated by a distance (r) is given by: F = G \frac{m_1 m_2}{r^2}, where G is the gravitational constant.

Front

What is the gravitational constant (G)?

Back

The gravitational constant (G) is approximately 6.674 × 10^-11 N(m/kg)^2.

Front

What is the formula for calculating work done by a constant force?

Back

The formula for work done (W) by a constant force is: W = F \cdot d \cdot \cos(\theta), where F is the force, d is the distance, and \theta is the angle between the force and the direction of motion.

Front

What is the difference between kinetic energy and potential energy?

Back

Kinetic energy is the energy of an object due to its motion, while potential energy is the stored energy of an object due to its position or configuration.

Front

What is the formula for calculating potential energy?

Back

The formula for gravitational potential energy (U_g) is: U_g = mgh, where m is mass, g is the acceleration due to gravity, and h is height.