Test 1 Intro to Energy, Temperature

A cold block of metal is placed in contact with a warm block of metal. Which type of energy will be transferred between the blocks?

• thermal energy

• chemical energy

• electrical energy

• mechanical energy

What is the law of conservation of energy?

• The total amount of energy on Earth is constant.

• Energy can only be created when a force acts on an object.

• Heating an object creates energy and cooling destroys energy.

• Energy cannot be created or destroyed but it can be transformed.

Study the features of the image.

When the slingshot is held in position as in the diagram, what kind of energy is present?

• kinetic energy

• potential energy

• electrical energy

• electromagnetic energy

Doctors can use x-rays to examine broken bones. Which form of energy is represented by x-rays?

• nuclear energy

• chemical energy

• electrical energy

• electromagnetic energy

Which of these is an example of the conversion of kinetic energy into gravitational potential energy?

• a bicyclist coasting down a long hill

• a car engine moving the car forward

• a roller coaster car moving toward the top of a rise in the tracks

• a thrown ball falling toward the ground after passing through the top part of its motion

During science class, Sophie measures the temperature of water every minute as it is heating. After a few minutes, the temperature is 82°C. How far below the boiling point of water is this?

(Hint: Pure water boils at 100 °C)

• 8°C

• 18°C

• 130°C

• 191°C

Karen drew the models below of particles in a substance. Which model best represents the particles in a solid?

• 
• 
• 
• 

Liang is warming a pot of soup on the stove. How is the motion of the particles in the soup different after the temperature of the soup increases?

• They move less freely.

• They move faster on average.

• They have less average energy.

• They vibrate and are close together.

A scientist warms a chemical to 385 K, and the chemical begins to boil. How much higher is this boiling point of the chemical than the boiling point of water?

(Hint: Pure water boils at 373 K)

• 12 K

• 73 K

• 112 K

• 173 K

A ball rolls across the grass. Which of these statements best describes what happens to the particles that make up the ball after the ball stops rolling?

• The particles are not moving.

• The particles are vibrating in place.

• The particles are sliding past each other.

• The particles are moving from the ball to the grass.