7th Grade Science Test Review 3rd Six Weeks

Front

What is an unbalanced force?

Back

An unbalanced force is a force that causes an object to accelerate or change its motion because the forces acting on it are not equal in size and opposite in direction.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials, where heat moves from the hotter object to the cooler one.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases) where warmer, less dense areas rise and cooler, denser areas sink.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves, such as sunlight, which can travel through a vacuum.

Front

What does a net force of 0N indicate about a system?

Back

A net force of 0N indicates that the forces acting on an object are balanced, resulting in no change in motion.

Front

What happens when forces are balanced?

Back

When forces are balanced, the object will either remain at rest or continue to move at a constant speed in a straight line.

Front

What is the effect of increasing force on an object?

Back

Increasing the force applied to an object will cause it to accelerate, resulting in a change in its speed or direction.

Front

What is the relationship between mass and acceleration?

Back

According to Newton's second law, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma).

Front

What is an example of heat transfer by convection?

Back

An example of heat transfer by convection is warm air rising and cool air sinking, creating a circulation pattern.

Front

What is the role of a wooden handle on a pot?

Back

A wooden handle on a pot prevents burns by conduction, as wood is a poor conductor of heat.