When the skater is dropped onto the ramp from above, the potential energy decreases and the kinetic energy increases. Every time the skater bounces from the impact, thermal energy is gained, and both potential and kinetic energy are lost.
What is the effect of dropping the skater from a height above the track explain in terms of conservation of energy?
If the skater is dropped onto the ramp from above the potential energy is high but as the skater goes down the potential energy converts to kinetic energy and as the skater hits the ramp the thermal energy increases, every time he bounces on the ramp, as the kinetic and potential energy decreases.
What is the relationship between PE and the height of the skater on the track?
The higher the skater is the more potential energy he has. As his height decreases, his potential energy decreases and his kinetic energy increases.
How is energy conserved when a skater goes down a ramp?
As the skateboarder goes down the ramp, potential energy is converted to kinetic energy. Because of friction, some of the energy in the system is converted to heat energy. Once the kinetic energy is converted to heat, the energy cannot be converted back to the potential or kinetic energy in the system.
What happened when you increase and decrease the mass of the skater Why do you think?
Why do you think that happened? When the skater’s mass increased, he had higher kinetic and potential energy as he went up and down the ramp. His total energy increased too. An increase in mass comes with an increase in kinetic and potential energy.
Does the skater hit the same height on the opposite sides of the track?
Yes, the skater hits the same height on both sides of the track.
What was the effect on the skaters maximum kinetic energy when he was placed further down the ramp?
The skater’s kinetic energy increases as he moves down the ramp. The skater’s kinetic energy decreases as he moves up the ramp. As the skater moves down the ramp, his potential energy decreases.
When the skater is at the top of the track the potential energy is?
0 J
As previously discussed, the skater has the most potential energy at the top of the slope. As the skater moves down the slope, his potential energy decreases as the kinetic energy increases. The lowest point of the slope is located on the Ep = 0 J reference point.
How will the presence of friction affect the skater and the energies you described above?
Energy Transfer with Friction How will the presence of friction affect the skater and the energies you described above? When friction is involved some of the kinetic energy will change to the thermal energy and the total energy will include the thermal and kinetic energy.
What type of energy does the skater have at the lowest point on the track?
The kinetic energy of an object is given by K=(1/2)mv2, where v is the speed of the object and m is the mass of the object. Thus, the skater’s kinetic energy is greatest at the lowest point of the track, where the skater is moving the fastest. Now observe the potential energy bar on the Bar Graph.
Why the skater rises to the same height on each side of the ramp?
The skater is going up and down the ramp without losing energy, because the ramp is frictionless. Due to this, he continues to reach the same height on each end of the ramp as his kinetic energy (energy of motion) is converted to gravitational potential energy (energy of position).
What type of energy is in a moving skateboard?
Kinetic
Kinetic (KE)
The energy an object has due to it’s motion.
Do you think a moving skateboard has energy Why or why not?
So, does a moving skateboard have energy? Yes. It’s kinetic energy, the one found in objects in motion. Otherwise, it’s potential energy.
What happens when a skater extends her arms?
By extending her arms and one leg, a figure skater can increase her moment of inertia. By pulling her arms and legs close to her body, she can decrease her moment of inertia. The figure skater’s angular momentum must re- main constant according to the law of conservation of angular momentum.
When an ice skater spins and increases her rotation rate by pulling her arms and leg in what happens to her rotational kinetic energy?
When the hands and legs are brought close to the rotational axis, the rotational inertia decreases thereby increasing the skaters angular velocity as per the conservation of angular momentum. Increase in angular velocity implies increase in the kinetic energy. Thus option A is correct.
Will the skater will make it over the first hump assume there is no friction?
Do you think the Skater will make it over the first hump? (no friction on the track? Option C: Yes, Because all of his potential energy will be converted to kinetic energy.
When friction is ignored which of the following quantities remains the same as the skater moves from one side of the track to the other?
Ignoring friction, the total energy of the skater is conserved. This means that the kinetic plus potential energy at one location, say E1=K1+U1, must be equal to the kinetic plus potential energy at a different location, say E2=K2+U2.
How does friction affect the mechanical energy in a system?
Friction and air resistance are both external forces and would do work upon the moving object. In fact, the presence of friction and air resistance would do negative work and cause the total mechanical energy to decrease during the course of the motion.
How could you change your track to maximize the kinetic energy of the skater explain?
How could we change our track to maximize the KE of the skater? We could change our track by making steeper slopes and making the skater start from a higher point.
When a skateboarder skates down a ramp she speeds up which increases her kinetic energy where does that extra energy come from?
Gravitational potential energy gets converted to kinetic energy as the skater goes down one side of the ramp, then gets converted back to gravitational potential energy as they go up the other side.
What happens to the total mechanical energy of an object as it moves up and down?
Total Mechanical Energy
In a single event, the sum of the two types of mechanical energy is always the same. Sure, the potential and kinetic energy change rapidly as the ball goes up and down, but their sum is always the same.