24-25 Semester Check Units 1-4

Front

What is net force?

Back

Net force is the total force acting on an object after all the individual forces are combined. It determines the object's motion.

Front

What happens when the net force on an object is zero?

Back

When the net force is zero, the object is either at rest or moving at a constant speed in a straight line.

Front

How does friction affect motion?

Back

Friction opposes the motion of an object, causing it to slow down or stop.

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change results in the formation of new substances, while a physical change does not alter the substance's chemical identity.

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 compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What does it mean for an object to have constant speed?

Back

Constant speed means that the object covers equal distances in equal intervals of time, without speeding up or slowing down.

Front

What is the role of gravity in motion?

Back

Gravity is a force that attracts objects toward each other, affecting their motion, especially in free fall.

Front

What is the formula for calculating speed?

Back

Speed = Distance / Time.

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.