7th Grade Semester Exam

Front

What is a balanced force?

Back

A balanced force occurs when two forces acting on an object are equal in size but opposite in direction, resulting in no change in motion.

Front

What is an unbalanced force?

Back

An unbalanced force occurs when two forces acting on an object are not equal, causing the object to accelerate in the direction of the greater force.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together, and it can only be separated by chemical means.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is velocity?

Back

Velocity is the speed of an object in a specific direction.

Front

What is the equation for speed?

Back

Speed = distance/time.

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object over time.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What is the unit of speed?

Back

The unit of speed is typically meters per second (m/s) or kilometers per hour (km/h).