2024-25 Common Assessment ( December)

Front

What does the strength of the force of gravity depend on?

Back

The strength of the force of gravity depends on the masses of the objects and the distance between them.

Front

What type of energy is most directly obtained from fossil fuels like coal, oil, and natural gas?

Back

Thermal energy.

Front

What effect does wrapping a beaker in aluminum foil have on heat transfer?

Back

Layers of air between the foil wrappings reduce the transfer of heat.

Front

What type of reaction occurs when two chemicals in a beaker sitting in an ice water bath cause the ice to melt?

Back

An exothermic reaction in which energy is released.

Front

Which object has more kinetic energy when two objects of different masses are in motion?

Back

The object with more mass.

Front

Define kinetic energy.

Back

Kinetic energy is the energy an object possesses due to its motion.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy to its surroundings.

Front

What is the formula for calculating kinetic energy?

Back

Kinetic energy (KE) = 1/2 mv², where m is mass and v is velocity.

Front

What is the role of thermal energy in heating substances?

Back

Thermal energy is the energy that comes from the temperature of matter; it is the total kinetic energy of particles in a substance.