Physics G09 ADV 1

A ball is at rest at the top of a hill.

The ball rolls down the hill.

At the bottom of the hill the ball hits a wall and stops.

Which energy changes occur?

• gravitational potential energy → internal energy → kinetic energy

• gravitational potential energy → kinetic energy → internal energy

• kinetic energy → gravitational potential energy → internal energy

• kinetic energy → internal energy → gravitational potential energy

Energy is continually transferred from one object to another and between its various possible forms

• True

• False

The energy of a moving object is calculated by

A ball of mass 1.0 kg is moving at a speed of 8 m/s.

What is the kinetic energy of the ball?

• 4 J

• 8 J

• 32 J

• 64 J

Energy stored in the nucleus of an atom is __________ energy

• mechanical

• chemical

• nuclear

• thermal

Changing the shape of a body will change its (strain) _______ energy

• elastic

• kinetic

• chemical

 the expression for gravitational potential energy

• mgh

• h/mg

• 1/2 mv

• W/t

A ball of mass 1.2 kg is thrown upwards and reach a height of 2.5 m. the gravitational field strength g = 10 N/kg

• 30 J

• 30 W

• 3 m

• 3 J

total change of energy in any system is always equal to the total energy transferred into or out of the system. Energy cannot be created or destroyed, but it can be transported from one place to another and transferred between systems.

What does the above statements describe?

• mechanical energy

• Conservation of energy

• nuclear energy

• efficiency

The effiecency of the lamp whose sankey diagram is shown is _____%

• 90

• 12

• 10

• 80