E2. E.3 Summative Review

The graph represents the motion of an object. Based on the graph, which statement is true?

• The object is losing kinetic energy between 2.5 and 3.5 seconds
• The object is gaining kinetic energy between 2.5 and 3.5 seconds
• Between 0 and 2 seconds the object is gaining kinetic energy
• Between 0 and 2 second the object is losing kinetic energy

Potential energy

• Energy stored in chemical bonds
• Energy of motion
• A broad category meaning "stored energy"
• Energy stored based on height above ground

Potential 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.

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

• Claudia
• Samantha
• Luis
• --

A wagon is pushed across a, level surface and released. After the push, the wagon is observed to move at constant speed. Identify the statement that best explains the wagon’s motion.

• The wagon is moving at constant speed because the hand’s force is acting from a distance.
• The wagon is moving at a constant speed because the surface has negligible friction.
• The wagon is moving at a constant speed because the wagon is constantly transferring energy to the surface through friction.
• The wagon is moving at a constant speed because its kinetic energy is decreasing.

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

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.

Cart A is moving and collides with Cart B. As a result, Cart A stops and Cart B moves. This is an example of:

• Energy diagram
• Energy trade
• Energy transfer
• Energy conversion

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

• Increasing KE
• Decreasing KE
• Constant KE
• Zero KE

A cart is traveling along a track and slows down due to friction. Which of the statements below best explains why the cart slows down, in terms of energy?

• Kinetic energy from the cart is converted to chemical energy in the track
• Kinetic energy from the cart is converted to thermal energy in the cart and track
• Kinetic energy from the cart is converted to potential energy in the cart and track
• Kinetic energy from the cart is converted to thermal energy in the air