quizizz

What is the Work-Energy Theorem and how does it relate work to energy?

• The Work-Energy Theorem states that energy cannot be created or destroyed.

• The Work-Energy Theorem relates work to energy by stating that the work done on an object equals the change in its kinetic energy.

• Work is independent of energy and does not affect motion.

• The theorem only applies to objects at rest and not in motion.

Define kinetic energy and provide its formula.

• The formula for kinetic energy is KE = 0.5 * m * v^2, where KE is kinetic energy, m is mass, and v is velocity.

• KE = 0.5 * m * v

• KE = m * v

• KE = m * v^2 / 2

What is potential energy and how is it calculated?

• Potential energy is the energy released during a chemical reaction, calculated using bond energies.

• Potential energy is the energy of motion, calculated as KE = 1/2 mv^2.

• Potential energy is the energy of an object in motion, calculated as PE = mv^2.

• Potential energy is the energy stored in an object due to its position, calculated as PE = mgh.

Explain the concept of mechanical advantage in simple machines.

• Mechanical advantage refers to the weight of the machine itself.

• Mechanical advantage is the distance traveled by the input force.

• Mechanical advantage is the ratio of output force to input force in a simple machine.

• Mechanical advantage is the speed of a simple machine.

What are the different types of energy? Give examples of each.

• Kinetic Energy, Potential Energy, Thermal Energy, Chemical Energy, Electrical Energy, Nuclear Energy, Mechanical Energy

• Hydraulic Energy

• Wind Energy

• Solar Energy

How does a lever work and what is its mechanical advantage?

• A lever works by pushing down on one end without a fulcrum.

• A lever increases speed rather than force.

• A lever works by using a fulcrum to amplify force, with a mechanical advantage determined by the ratio of distances from the fulcrum.

• A lever operates by balancing weights on both sides.

What is the formula for calculating work done on an object?

• Work = Distance / Time

• Work = Force / Distance

• Work = Force × Distance × cos(θ)

• Work = Force + Distance

How does a pulley system provide mechanical advantage?

• A pulley system requires equal force to lift any load.

• A pulley system increases the weight of the load being lifted.

• A pulley system only works with lighter loads.

• A pulley system allows a smaller force to lift a heavier load by distributing the weight across multiple ropes.

What is the difference between elastic potential energy and gravitational potential energy?

• Elastic potential energy is always greater than gravitational potential energy.

• Elastic potential energy is related to deformation of objects, while gravitational potential energy is related to an object's height in a gravitational field.

• Gravitational potential energy depends on the material properties of an object.

• Elastic potential energy is only relevant in fluid dynamics.

Explain how a wedge functions as a simple machine.

• A wedge functions by compressing materials together.

• A wedge is a simple machine that converts force applied to its blunt end into a greater force at its sharp end, allowing it to split or lift objects.

• A wedge is a type of lever that amplifies speed rather than force.

• A wedge is used to create rotational motion in machines.