Module 10 Lesson_1_Work_and_Energy

It states that the momentum of any closed, isolated system does not change.

It states that energy cannot be created or destroyed.

It states that force equals mass times acceleration.

It states that the velocity of an object remains constant unless acted upon by a force.

Fd = 1/2 mv_f^2

- 1/2 mv_i^2

W = Fd cos θ

W = Fd

F = ma

Work is done only when a force causes displacement in the direction of the force.

Work is always done when a force is applied, regardless of displacement.

Work is done only if the force is perpendicular to the displacement.

Work is done only if the force is opposite to the displacement.

The work done by the force

The velocity of the object

The acceleration of the object

The mass of the object

Identify and sketch the system

Find the angle between force and displacement

Calculate the work done by each force

Ignore the direction of displacement

It increases

It decreases

It stays the same

It becomes zero

10.0°

0°

90°

45°

The energy associated with motion, represented by KE.

The energy stored in chemical bonds.

The energy due to an object's position relative to Earth.

The energy released during nuclear reactions.

Throwing a ball involves positive work, increasing kinetic energy.

Catching a ball involves negative work, decreasing kinetic energy.

The direction of force determines whether work is positive or negative.

The bar graph height represents the amount of work or energy in joules.

28 kW

22 kW

35 kW

10 kW