E2 E3 Review 25-26

A cart is moving on a flat surface with negligible friction. Infer what will happen to its speed.

• The cart’s speed will increase.

• The cart’s speed will decrease.

• The cart’s speed will remain constant.

• The cart’s speed will initially increase, and then decrease.

This graph represents an object

• Slowing down, but since it's velocity is negative, the KE is increasing

• Slowing down, which means its kinetic energy is decreasing

• Speeding up, which means its kinetic energy is increasing

• Slowing down, which means its kinetic energy is increasing

What is true about the kinetic energy of the object

• It decreases, then increases

• In increases, then decreases

• It stays constant

• It decreases, then stays the same

Kinetic energy is a ...

• scalar quantity because it only has magnitude.

• scalar quantity because it has both magnitude and direction.

• vector quantity because it only has magnitude.

• vector quantity because it has both magnitude and direction.

During which timer interval(s) is the man slowing down?

• 2-3, 5-6

• 3-5

• 8-9

• 9-10

Which student's statement contains more than just an observation?

• Claudia

• Samantha

• Luis

• --

While walking I observe some flowers. Select the inference:

• The flowers are on stalks that have green leaves

• There are five flowers

• The flowers are pink

• Someone planted and waters the flowers

What is happening to the object’s KE in region C?

• Increasing KE

• Decreasing KE

• Constant KE

• Zero KE

During which timer interval(s) is the man losing kinetic energy?

• 2-3, 5-6

• 3-5

• 8-9

• 9-10

A pendulum is swinging back and forth. As it swings it trades having kinetic energy for gravitational potential energy, and vice versa. This is an example of...

• Energy diagram

• Energy trade

• Energy transfer

• Energy conversion