How does the force of friction affect the motion of objects? It causes the object to change direction.
It causes the object to create heat energy.
It causes the object to create kinetic energy.
It causes the object to slow down or stop.

Explanation:

The concepts developed in this standard include the following:

· The position of an object can be described by locating it relative to another object or the background.

· Tracing and measuring its position over time can describe an object’s motion.

· Speed describes how fast an object is moving.

· A force is any push or pull that causes an object to move, stop, or change speed or direction.

· The greater the force, the greater the change in motion will be. The more massive an object, the less effect a given force will have on the object.

· Energy may exist in two states: kinetic or potential.

· Kinetic energy is the energy of motion.

· Friction is the resistance to motion created by two objects moving against each other. Friction creates heat.

· Unless acted on by a force, objects in motion tend to stay in motion and objects at rest remain at rest. In order to meet this standard, it is expected that students should be able to:

· identify the forces that cause an object’s motion.

· describe the direction of an object’s motion: up, down, forward, backward.

· infer that objects have kinetic energy.

· design an investigation to determine the effect of friction on moving objects.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)