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Questions and Answers

Compare and contrast weight and mass.

Weight is the force of gravity acting on a mass, while mass is the amount of matter in an object. Weight can change depending on the gravitational force, but mass remains constant.

Describe what a contact force is.

A contact force is a force that requires direct contact between two objects to occur.

Draw the triangle for calculating weight and mass.

Weight is at the top, with mass and gravity at the bottom corners. Weight = mass × gravity.

Name the piece of equipment shown.

Hydrometer. Signup and view all the answers

Describe how the planets move.

Planets move in elliptical orbits around the sun. Signup and view all the answers

Describe how planets orbit the sun in the same plane.

Planets orbit the sun in roughly the same plane, known as the ecliptic. Signup and view all the answers

What is gravity?

Gravity is a force of attraction between objects with mass. Signup and view all the answers

Describe the shape of the orbits of the planets.

The orbits of the planets are elliptical. Signup and view all the answers

Describe what air resistance is.

Air resistance is a force that opposes the motion of an object through the air. Signup and view all the answers

Describe what a tide is.

A tide is the periodic rise and fall of sea level caused by the gravitational forces of the moon and sun. Signup and view all the answers

What are the two objects that cause the force of gravity for tides on Earth?

The moon and the sun. Signup and view all the answers

Tidal forces on Earth are due to the _______ forces.

gravitational Signup and view all the answers

How long does it take for the earth to spin on its axis?

Approximately 24 hours. Signup and view all the answers

Describe what energy is.

Energy is the ability to do work. Signup and view all the answers

Define Kinetic (mechanical) energy.

Kinetic (mechanical) energy is the energy possessed by an object due to its motion or position. Signup and view all the answers

Define Chemical energy.

Chemical energy is the energy stored in the bonds of chemical compounds that can be released during a chemical reaction. Signup and view all the answers

Define Elastic potential energy.

Elastic potential energy is the energy stored in an object that is stretched or compressed, like a spring or rubber band. Signup and view all the answers

Define Gravitational potential energy.

Gravitational potential energy is the energy an object has due to its position in a gravitational field. Signup and view all the answers

Define Sound energy.

Sound energy is the energy produced by vibrating objects that travel through a medium, such as air or water. Signup and view all the answers

Define the key term 'dissipated'.

'Dissipated' refers to energy that is spread out or dispersed, often as heat, and is no longer available to do useful work. Signup and view all the answers

What is the difference between useful or wasted energy?

Useful energy is energy that performs its intended function, while wasted energy is energy that is converted into less useful forms, such as heat or sound, and is no longer available for its intended purpose. Signup and view all the answers

Write down the definition for Mrs. Gren.

Mrs. Gren is an acronym to help remember the 7 characteristics of living things. Movement, Reproduction, Sensitivity, Growth, Respiration, Excretion, Nutrition. Signup and view all the answers

What does respiration mean?

Respiration is the process by which living organisms convert nutrients into energy, releasing waste products in the process. Signup and view all the answers

What does photosynthesis mean?

Photosynthesis is the process by which green plants and some other organisms use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugar. Signup and view all the answers

Is photosynthesis part of Mrs. Gren?

True (A) Signup and view all the answers

Is a virus living or non-living?? Describe why it is not living. Give some evidence.

Viruses are generally considered non-living because they cannot reproduce on their own; they require a host cell to replicate. They also lack other characteristics of living organisms, such as metabolism. Signup and view all the answers

What is a virus?

A virus is a small infectious agent that replicates only inside the living cells of other organisms. Signup and view all the answers

What is a species? Write at least three sentences describing what a species is. Give an example:

A species is a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. Species is the principal natural taxonomic unit, ranking below a genus. A species is often defined as the largest group of organisms in which two individuals are capable of reproducing fertile offspring, typically using sexual reproduction. An example would be humans, which are considered one species. Signup and view all the answers

What does the word dichotomous mean?

Dichotomous means divided or dividing into two sharply distinguished parts or classifications. Signup and view all the answers

Flashcards

Mass

The amount of matter in an object.

Weight

The force of gravity acting on an object's mass.