Q2: Calculate the average speed at 2 hours. As he entered the last lap of the race, Daniel was driving 24.6 m/s. Thirty seconds later he crossed the finish line at 42.5 m/s. Find his acceleration. 3. Karizma completed a 10.0 km race in exactly 30 minutes. Find her average speed in km/hr.

Today’s Objective: I understand the effect an object’s position has upon its energy.

always pulling toward the center of the Earth Gravitational Force always pulling toward the center of the Earth Force: measured in Newton's

Newton: SI unit of force the force that would give a mass of one kilogram an acceleration of one meter per second per second

Unit of force: Newton N = 1 kg * m/s2

Weight: The force of gravity acting upon an object Weight vs Mass? Weight: The force of gravity acting upon an object

Weight = Fg Fg = mg

An African elephant can An African elephant can reach heights of 13 feet and possess a mass of as much as 6000 kg. Determine the weight of an African elephant in Newtons and in pounds. (Given: 1.00 N = .225 pounds)

Free Fall: The downward motion of an object with only the force of gravity acting upon it

The maximum velocity an object will reach as it falls Terminal Velocity The maximum velocity an object will reach as it falls

FAster and faster?

Terminal Velocity = Constant Air Force Resistance = of gravity

Hyperlink penny falling picture to myth buster video

What force is acting upon a soccer ball that doesn’t run into anything but still falls to the ground? Gravity

Combination of forward and vertical forces (gravity)  Curved Projectile Motion: Combination of forward and vertical forces (gravity)  Curved

Energy: the ability to perform some kind of work Joules: SI unit of measuring energy

Joule: SI Unit of energy

2 General Types of Energy Kinetic Energy: The energy of motion Depends on mass and speed

2 General Types of Energy Kinetic Energy: The energy of motion Depends on mass and speed

KE KE

Mikayla is riding The Sooper Coaster. Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s.

Energy that is stored based on the position of the object Potential Energy: Energy that is stored based on the position of the object

Candis is diving from the top of a 10. 0 m high diving platform Candis is diving from the top of a 10.0 m high diving platform. She has a mass of 50 kg. Calculate her potential energy relative to the ground.

Today’s Objective: I can describe motion using Newton’s Law’s of Motion.

Arrange 4 pennies in a row so they are touching each other. Using your index finger, slide a 5th penny across the surface in line with the row of pennies so that it strikes a penny at one end of the row.

Write a description of your observations Write a description of your observations. Describe how each penny moves as a result of the collision. What do you think caused the pennies to move after the collision? Why didn’t they move before the collision?

Create a table that looks like this: Trial Observation Fast Slow Accelerate/ Stop

Place the index card flat on the table. Put a coin in the middle of the card. As quickly as you can, remove the card by sliding it out from under the coin. Record your observations.

Repeat step one removing the card slowly. Record your results.

Repeat step one again. This time slowly accelerate the card and then suddenly bring it to a stop. Record your observations.