Energy

What is work in physics?

• Work in physics is the sum of all forces acting on an object.

• Work in physics is the product of force and displacement in the direction of that force.

• Work in physics is the change in temperature of an object.

• Work in physics is the speed at which an object moves.

How is energy defined in mechanics?

• Energy in mechanics is defined as the speed of movement.

• Energy in mechanics is equal to the mass of the object.

• Energy in mechanics is measured in meters.

• Energy in mechanics is defined as the ability of a system to do work.

What is the formula for calculating work?

• A = F - d

• A = F / d

• A = F * d * cos(θ)

• A = F + d

What is kinetic energy?

• Kinetic energy is the energy associated with potential motion.

• Kinetic energy is the energy that does not depend on speed.

• Kinetic energy is the energy that arises only in static objects.

• Kinetic energy is the energy associated with the motion of a body.

What is the relationship between work and energy?

• Work does not affect the state of the system.

• Work is a measure of the change in energy.

• Energy always remains constant when work is done.

• Work and energy are not related.

What is potential energy?

• Potential energy is the energy that arises only when objects are in contact.

• Potential energy is the energy that is always equal to zero.

• Potential energy is the energy associated with the position of an object in a field of forces.

• Potential energy is the energy associated with the motion of an object.

How does energy change in a closed system?

• Energy is lost in a closed system.

• Energy increases in a closed system.

• Energy can change depending on external factors.

• Energy is conserved and does not change in a closed system.

What are the units of measurement for work?

• Calories (kcal)

• Joules (J)

• Newtons (N)

• Watts (W)

What is the law of conservation of energy?

• The law of conservation of energy applies only in open systems.

• The law of conservation of energy states that energy can be created from nothing.

• The law of conservation of energy states that energy always increases over time.

• The law of conservation of energy is a principle that states that the total energy in a closed system remains constant.

How does work affect the motion of a body?

• Work does not affect the motion of a body.

• Work always increases the speed of a body.

• Work only decreases potential energy.

• Work affects the motion of a body by changing its kinetic or potential energy.