Check in A Review Science Part 3

Front

What happens to the mass of a sheet of paper when it is torn into pieces?

Back

The total mass of the pieces would be the same as the mass of the whole sheet.

Front

What force is responsible for making objects fall to the ground?

Back

Gravity.

Front

What is a chemical change?

Back

A chemical change is a process where a substance transforms into a new substance, such as wood turning into ashes.

Front

How can speed be calculated?

Back

Speed = Distance ÷ Time.

Front

What does a constant speed mean in a race?

Back

It means the runner maintains the same speed without slowing down or speeding up.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of friction in motion?

Back

Friction is a force that opposes motion between two surfaces in contact.

Front

What is momentum?

Back

Momentum is the quantity of motion an object has, dependent on its mass and velocity.

Front

What is the significance of ashes after burning wood?

Back

Ashes are a new substance formed from the chemical change of burning wood.

Front

How can we determine who took a rest during a race using a graph?

Back

A scientist can identify a runner who took a rest by looking for flat sections on the graph where speed is zero.