Kinetic Energy

Kinetic Energy

Poll

Five football players argued when a football has energy. With whom do you agree?

• The ball has to be moving to have energy

• The ball has energy only at moment it is kicked

• The ball has energy only when it is not moving

• The ball has energy when it is moving and not moving

• The ball has no energy. There is no source of energy in the ball

Design a rocket cup

• Pick up one cup

• Use the materials provided on the table

• Do a solo experiment

• Modify your design until it is ready

• You have 5 Minutes

• Whose cup will travel further?

Multiple Choice

Increasing the force applied to the cup will make it

• Go greater distance

• Go less distance

Multiple Choice

Having a very lightweight cup will cause it to

• Go greater distance

• Go less distance

Kinetic Energy

is the energy due to motion.

Multiple Select

Which of these objects have kinetic energy?

• Airplane in flight

• Airplane at rest

• basketball being dribbled

• Car on highway

• Parked car

Wrecking Ball

https://www.youtube.com/watch?v=VP8KjbXuP8Y

Multiple Choice

Would a wrecking ball be effective if it was made of light material such as wood?

• Yes

• No

The relationship is linear.

Multiple Choice

If the mass of an object is increased by a factor of 4, the kinetic energy will increase by a factor of:

• 1

• 2

• 3

• 4

Multiple Choice

If the mass of an object is decreased by a factor of 2, the kinetic energy will decrease by a factor of:

• 1

• 2

• 3

• 4

How are kinetic energy and speed related?

The relationship is not linear.

The energy increases with a square of the speed.

 $KE=\frac{1}{2}\times\ m\ \times\ v^2$  

Multiple Choice

If the speed of an object is increased by a factor of 4, the kinetic energy will increase by a factor of:

• 4

• 8

• 16

• 20

Multiple Choice

If the speed of an object is increased by a factor of 3, the kinetic energy will increase by a factor of:

• 4

• 8

• 9

• 6

Multiple Choice

Five football players argued when a football has energy. With whom do you agree?

• The ball has to be moving to have energy

• The ball has energy only at moment it is kicked

• The ball has energy only when it is not moving

• The ball has energy when it is moving and not moving

• The ball has no energy. There is no source of energy in the ball