Science

What is a force

A push, pull or twist

What are the three ways forces can change an object?

Shape, direction and motion.

What is a contact force?

A force that acts when objects are touching.

Give two non-contact forces.

Gravity and magnetism

What happens with balanced forces?

There is not change in motion

What happens with unbalanced forces?

Motion changes

What do charges do?

Repel

What do opposites changes do?

Attract

What does gravity do?

Pulls objects towards Earth's centre

What is the formula for weight?

F=mg

What is the difference between mass and weight

Mass is the amount of matter, weight in the force of gravity on an object

What are the 6 simple machines?

lever, wheel and axle, inclined plane, wedge, screw, pulley

What is an independent variable?

The thing you change

What is the dependent variable?

The thing you measure

What are the 3 parts of cell theory?

Living things are made of cells, cells are the basic unit of life, and cells come from existing cells.

What does the nucleus contain?

DNA

What controls what enters and leaves the cell?

Cell membrane

What is the job of mitochondria?

Cellular respiration and releasing energy

What is the job of chloroplasts?

Photosynthesis

What does the cell wall do?

Supports and strengthens the plant cell

What is a unicellular organism?

An organism made of one cell

What is a multicellular organism?

An organism made of many cells

Where does cellular respiration happen?

Mitochondria

Where does photosynthesis happen?

Chloroplast

What is a specialised cell?

A cell adapted to preform a specific job.

What is the order of organisation?

Cells, tissues, organs, organ systems, organism.