kinetic and potential energy calculations

What is the significance of the acceleration due to gravity in energy calculations?

• It determines the speed of an object in free fall.

• It is crucial for calculating potential energy, as it determines how much energy an object has based on its height.

• It affects the mass of an object in motion.

• It is only relevant in space where gravity is negligible.

What does it mean if an object has zero kinetic energy?

• The object is moving at a constant speed.

• The object is at rest (velocity = 0 m/s).

• The object is in free fall.

• The object is experiencing friction.

How do you calculate kinetic energy?

• KE = 1/2 mv², where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

• KE = mv, where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

• KE = 1/2 m²v, where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

• KE = mv², where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

What is the unit of energy?

• Calorie (cal)

• Watt (W)

• Joule (J)

• Volt (V)

What is kinetic energy?

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

• The energy stored in an object due to its position or configuration.

• The energy transferred from one object to another during a collision.

• The energy associated with the temperature of an object.

If 150 Joules of work is done moving a box 10 meters, what is the force applied?

• 10 N

• 15 N

• 20 N

• 25 N

How do you calculate gravitational potential energy?

• PE = mgh, where PE is potential energy, m is mass in kilograms, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is height in meters.

• PE = mv², where PE is potential energy, m is mass in kilograms, and v is velocity in meters per second.

• PE = mgh², where PE is potential energy, m is mass in kilograms, g is the acceleration due to gravity, and h is height in meters.

• PE = mg, where PE is potential energy, m is mass in kilograms, and g is the acceleration due to gravity.

What is the kinetic energy of a 0.3 kg marble moving at 6 m/s?

• 3.2 J

• 4.5 J

• 5.4 J

• 6.8 J

What is the relationship between potential energy and height?

• Potential energy decreases as height increases, assuming mass and gravity remain constant.

• Potential energy remains constant regardless of height changes.

• Potential energy increases as height increases, assuming mass and gravity remain constant.

• Potential energy is unrelated to height.

What is the mass of an object if it has a potential energy of 56.8 J at a height of 2.5 m?

• 1.50 kg

• 2.32 kg

• 3.00 kg

• 2.00 kg