Force Work Energy Quiz

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

• Contact forces are stronger than non-contact forces.

• Contact forces are always attractive, while non-contact forces are always repulsive.

• Contact forces require physical contact between objects, while non-contact forces can act over a distance.

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

How is work calculated?

• Work = Power x Velocity

• Work = Force x Distance

• Work = Mass x Acceleration

• Work = Energy x Time

Define potential energy and give an example.

• Potential energy is the energy an object has due to its speed

• Potential energy is the energy an object has due to its temperature

• Potential energy is the energy an object has due to its position relative to other objects. It is stored energy that can be converted into other forms. For example, a ball held above the ground has gravitational potential energy.

• Potential energy is the energy an object has due to its color

What is kinetic energy and how is it calculated?

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

• Kinetic energy is calculated by multiplying mass and acceleration.

• Kinetic energy is the energy an object possesses due to its motion. It is calculated using the formula: KE = 0.5 * mass * velocity^2, where KE is the kinetic energy, mass is the object's mass, and velocity is the object's velocity.

• Kinetic energy is directly proportional to the object's volume.

Explain the law of conservation of energy.

• Energy conservation only applies to mechanical systems

• Energy can only be transferred between living organisms

• Energy can be created and destroyed at will

• Energy can neither be created nor destroyed, it can only be transferred or changed from one form to another.

What is power and how is it calculated?

• Power is measured in volts

• Power is calculated by the formula: Power = Force x Distance / Time

• Power is calculated by the formula: Power = Mass x Acceleration

• Power is inversely proportional to time

Give an example of a force that does work.

• Force of inertia

• Force of friction

• Force of gravity

• Force of magnetism

Calculate the work done when a force of 10N moves an object 5m.

• 15J

• 40J

• 25J

• 50J

What is gravitational potential energy?

• Gravitational potential energy is the energy generated by wind turbines

• Gravitational potential energy is the energy released during nuclear fusion

• Gravitational potential energy is the energy stored in a battery

• Gravitational potential energy is the energy an object possesses due to its position in a gravitational field.

Calculate the kinetic energy of an object with a mass of 2kg moving at a velocity of 4m/s.

• 6 J

• 8 J

• 16 J

• 12 J