PS3.3 Factors that effect kinetic energy.

PS3.3 Factors that effect kinetic energy.

At the end of this lesson you will be able to answer the following questions:

What two factors affect kinetic energy and how do they change the amount of kinetic energy in an object?

Which of the two factors has the greatest effect on kinetic energy?

Open Ended

Review: What is kinetic energy?

Multiple Select

Do you know: What two factors effect the kinetic energy of an object?

• mass

• potential energy

• speed

• thermal energy

Poll

Suppose a tennis ball rolls across the ground and hits your foot. What if a bowling ball moving at the same speed as the tennis ball were to hit your foot.

Which would hurt more?

• Tennis ball

• Bowling ball

• Same

• Not sure

Open Ended

The bowling ball would hurt more but why if they are both going the same speed?

The bowling ball hurts more because it has more kinetic energy.

The bowling ball has more kinetic energy because it has more mass.

Look at the graph.

If you add 1 kg of mass to the object, what will the kinetic energy be? What if you add 2kg of mass to the object?

Suppose a tennis ball was lightly throw at you. It would not hurt much right? What if the same tennis ball was throw at a fast speed? Now that would hurt, but why?

Multiple Choice

Why did the fast tennis ball hurt more than the lightly thrown tennis ball?

• It had more mass

• It had more speed

The faster an object moves the more kinetic energy it has.

In fact, if you double the speed of an object then its kinetic energy will be 4 times greater.

Take a few minutes to explore the energy simulator.

1. Make sure you click the bar graph and speed.
2. Change the mass of the skateboarder.

https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html

Open Ended

Exit Ticket:

Describe what you saw in the simulator.