Energy

What is energy?

• The capacity to do work

• The capacity to do force

• The capacity to change velocity without affecting the distance.

• The capacity to change the distance without affecting velocity

What is potential energy

• Stored energy

• Energy in motion

What is kinetic energy

• Energ in motion

• Stored energy

What is the mechanical energy of an object that is half its way falling and has a potential energy of 10 J and a kinetic energy of 15 J

• 10

• 15

• 5

• 25

What is the unit of energy?

• Joule

• Newton

• Meters per second

• Meters per second squared

A Joule is equal to

• Kg x m2/s2

• Kg x m/s2

• g x Km/h2

• g x Km /s2

The law of conservation of energy states that energy can be created or destroyed but not transfored into other forms of energy

• False

• True

The kinetic energy of an object with a mass of 2 g of mass and a velocity of 1 m/s is (KE=1/2m x v2)

• 1 J

• 2 J

• 1 N

• 2N

As a skater moves down a ramp, in the presence of friction, what happens to the total mechanical energy?

• It remains constant

• It increases

• It decreases

What type of energy does this rock have?

• Potential

• Kinetic

• None