Force, Energy, Power Quiz

What is the difference between contact and non-contact forces?

• Contact forces do not involve physical objects

• Contact forces are stronger than non-contact forces

• Non-contact forces only occur in a vacuum

• Contact forces require physical contact, while non-contact forces can act at a distance.

Define kinetic energy and provide an example.

• Kinetic energy is the energy an object possesses due to its motion. An example is a moving car.

• An example of kinetic energy is a stationary rock.

• Kinetic energy is the energy produced by heat.

• Kinetic energy is the energy stored in an object at rest.

State the work-energy theorem and explain its significance.

• The work-energy theorem is significant because it provides a direct relationship between work and energy, allowing for the analysis of mechanical systems and the prediction of their behavior.

• The work-energy theorem states that energy is not conserved in mechanical systems

• The work-energy theorem is used to calculate gravitational force

• The work-energy theorem is only applicable to non-mechanical systems

How is power calculated in the context of physics?

• Power is calculated by adding the force applied to an object and the object's velocity.

• Power is calculated by dividing the force applied to an object by the object's velocity.

• Power is calculated by subtracting the force applied to an object from the object's velocity.

• Power is calculated by multiplying the force applied to an object by the object's velocity.

Explain the concept of conservation of energy and give an example.

• Conservation of energy only applies to mechanical systems, not other forms of energy

• In a closed system, energy can be lost without any transformation

• Energy can be created and destroyed at will, leading to infinite resources

• Energy cannot be created or destroyed, only transformed from one form to another. An example is a swinging pendulum where potential and kinetic energy interchange but the total energy remains constant.

Name the four fundamental forces in nature.

• thermal force

• magnetic force

• cosmic force

• gravitational force, electromagnetic force, weak nuclear force, and strong nuclear force

Calculate the kinetic energy of an object with a mass of 5 kg and a velocity of 10 m/s.

• 50 J

• 250 J

• 75 J

• 100 J

If a force of 20 N is applied to an object over a distance of 5 meters, how much work is done?

• 25 J

• 80 J

• 100 J

• 50 J

A machine can do 500 J of work in 10 seconds. What is the power output of the machine?

• 200 Watts

• 50 Watts

• 100 Watts

• 300 Watts

In a roller coaster ride, how is potential energy converted into kinetic energy?

• Potential energy is converted into light energy

• Potential energy is converted into sound energy

• As the roller coaster car moves down the track, potential energy is converted into kinetic energy.

• Potential energy is converted into thermal energy