The ice cube is replaced by a 50 g plastic cube whose coefficient of kinetic friction is 0.20. How far will the plastic cube travel up the slope? Use work and energy.

검증된 단계별 안내

Identify the forces acting on the plastic cube: The forces include gravity, the normal force, and the kinetic friction force. The work-energy principle will be used to solve the problem.

Write the expression for the initial kinetic energy of the cube: \( KE_{initial} = \frac{1}{2} m v^2 \), where \( m \) is the mass of the cube and \( v \) is its initial velocity.

Determine the work done by friction: The work done by friction is \( W_{friction} = -f_k d \), where \( f_k = \mu_k N \) is the kinetic friction force, \( \mu_k \) is the coefficient of kinetic friction, \( N = m g \cos \theta \) is the normal force, and \( d \) is the distance traveled up the slope.

Write the expression for the change in gravitational potential energy: \( \Delta U = m g h \), where \( h = d \sin \theta \) is the height gained by the cube as it moves up the slope.

Apply the work-energy principle: \( KE_{initial} + W_{friction} = \Delta U \). Substitute the expressions for \( KE_{initial} \), \( W_{friction} \), and \( \Delta U \) into this equation, and solve for \( d \), the distance the cube travels up the slope.

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주요 개념

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Kinetic Friction

Kinetic friction is the force that opposes the motion of two surfaces sliding past each other. It is quantified by the coefficient of kinetic friction, which is a dimensionless value representing the ratio of the frictional force to the normal force. In this scenario, the coefficient of kinetic friction (0.20) indicates how much frictional force will act against the motion of the plastic cube as it moves up the slope.

Work-Energy Principle

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy. In this context, as the plastic cube moves up the slope, work is done against both gravity and friction. This principle allows us to calculate how far the cube will travel by equating the work done by the applied forces to the energy changes experienced by the cube.

Potential Energy

Potential energy is the energy stored in an object due to its position in a gravitational field. For an object on an incline, the potential energy increases as it rises to a higher elevation. In this problem, the change in potential energy as the plastic cube moves up the slope must be considered, as it will affect how far the cube can travel before coming to a stop due to the opposing forces of gravity and friction.