Energy Motion and Force

What is energy?

• The force that slows down the speed of an object

• The ability to make an object move or change in some way

• How fast an object is moving

• Electricity

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What are the two different types of energy?

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What is force?

• Something you do to an object to get it to slow down

• Something that you to to destroy an object

• A push or pull on an object that causes movement

• How fast an object is moving

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What is kinetic energy?

• Traveling downhill

• The energy of an object due to its position

• How fast an object is moving

• The energy of motion

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What is motion?

• A push or pull

• Walking, running, or skipping

• The change in an objects position over time

• How fast or slow something is traveling

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We participated in a simulation were we observed the energy of a skateboarder as it moved up & down a ramp. Based on our observations, the total energy of the skateboarder appeared to decrease. What is the best explanation for the decrease in total energy?

• The energy decreased because it transformed into other forms of energy like heat because of friction.

• The total amount of energy always decreases because energy can be created and/or destroyed.

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Which of the following is an example of a force that acts at a distance?

• A baseball hit by a baseball player's bat.

• An apple falling off of a tree to the ground.

• A water skier gliding across the water.

• A coyote walking along a canal bank.

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Mrs. Halleran dropped a tennis ball on the ground and watched it bounce. At what point does the ball have ONLY potential energy?

• When the ball hit the ground.

• At its highest position when it bounced back up..

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Newton's Laws of Motion states that an object in motion should keep moving until some force acts on it. What force would cause a soccer ball to stop rolling?

• Gravity

• Friction

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As an object rolls down a ramp its speed increases. When the object hits the base of the ramp and continues moving across a flat surface it continues moving at a CONSTANT speed. Why?

• Gravity stopped acting on the object.

• The amount of friction increased on the flat part of the tract.

• The forces on the object are balanced, so it will travel at the same speed.