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When swinging on a park swing when is your kinetic energy the least?

Question 1 options:

Kinetic energy is least at the lowest point of your swing when you are closest to the ground.

Kinetic energy is the least when you are halfway between the highest point of the swing and the bottom.

Kinetic energy is least at the at the top of the swing when you are still for a moment just before falling again.

Kinetic energy is least as you are moving past the bottom of the swing and going back up to the highest point.

Question 2 (3 points)
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?

Question 2 options:

all answers given are correct

Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.

Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.

This is because no energy is being created or destroyed in this system

Question 3 (3 points)
Studying energy involves determining the amount of energy an object has. This energy can be kinetic or potential, or it could be a combination of both. Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls, select when the ball would have the most kinetic energy from the choices given.

Question 3 options:

after it hits the ground and is no longer moving.

as it sits on top of a building that is 40 meters tall.

as it is halfway through the fall and it has reached a speed of 19.8 meters per second.

just before it is to hit the ground and it has reached a speed of 28 meters per second.

Question 4 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?

Question 4 options:

raise the box to a higher shelf

add items to the box and raise it to a higher shelf

all of the options listed here will increase the GPE

add items to the box to increase its mass on the self it is on

Question 5 (3 points)
Which is an example of an object increasing its kinetic energy

Question 5 options:

an airplane after parking at the gate on the airport runway

a rocket resting in the docking claps just before the launch sequence it to begin

a jogger running faster after spotting a mountain lion following him on the trial

a train that is no longer moving and has come to a complete stop at the station platform so people can board

Question 6 (3 points)
Changing which factor would NOT influence the total kinetic energy of a moving shopping cart?

Question 6 options:

Decreasing the mass or the speed of the cart

increasing the rate of speed you push it down the aisle

increasing the mass of the cart by adding items while moving

Turning a different direction at the end of the aisle while continuing to move at the same speed.

Question 7 (3 points)
Mechanical energy is defined as

Question 7 options:

potential energy

Energy of machines and tools

the energy of motion and position, which is represented by the formula KE + PE = ME

Energy of motion

Question 8 (3 points)
Two children are waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to the energy of the second child from the top to the bottom of the slide?

Question 8 options:

All energy stays the same, it does not change

The energy is destroyed

Kinetic energy would turn in to Potential energy at the bottom

Potential energy from the top of the slide would turn to Kinetic energy as they slide down, in turn the kinetic energy of the child coming down the slide will be given to the child sitting at the bottom when they collide.

Question 9 (3 points)
Conservation of mechanical energy is defined as

Question 9 options:

Energy of motion

Potential energy added to kinetic energy

Law of conservation of energy

The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance

Question 10 (3 points)
Which is an example of gravitational potential energy only.

Question 10 options:

a puppy walking around under a tree

an apple resting on the teacher’s desk

a rolling skateboard going down a hill

an elevator moving up to the 3rd floor