PE or KE?
Stored Energy = ?
Energy of Motion = ?
Potential Energy (Stored)
Kinetic Energy (Motion)
Forces that do not change an objects motion
Balanced Forces
If forces are going the same direction, you _________ them.
If forces are going opposite directions, you _________ them.
Add, Subtract
What does a straight flat line represent in a distance vs time graph represent?
An object is at rest / motionless / stopped
What is the formula we use to calculate speed?
Speed = Distance / Time
Potential Energy + Kinetic Energy = ?
Mechanical Energy
Forces that cause a change in an object's motion (speed, direction, etc. )
Unbalanced forces
A man pushes a wagon with 20 N of force to the right, friction pushes the wagon with 10 N of force to the left. What is the net force? Include direction.
10 N to the right
What does a straight diagonal line represent on a motion graph?
An object moving at a constant speed
A ball rolls 27 meters down a hill. It takes the ball 9 seconds to reach the bottom of the hill. What is the speed of the ball? Be sure to include units.
3 m/s
A snowball sits at the highest point of a snowy mountain. What type of energy does it have?
potential energy
Finish Newton's First Law:
An object in motion will stay in motion, and an object at rest will stay at rest until -
An unbalanced force acts on it.
During a game of Tug of War, team #1 pulls with a force of 47 N to the left and team #2 pulls with a force of 59 N to the right. What is the net force? Be sure to include direction.
12 N to the right
What does a line curving up on a motion graph represent?
An object accelerating / speeding up
A car drives 625 miles in 10 hours. What is the average speed of the car? Be sure to include units.
62.5 mph
A man rides his bike down a very tall hill. What type of energy is increasing as he travels down the hill?
Kinetic energy
A soccer ball is kicked towards the net to make the winning goal. This is an example of what type of forces?
Unbalanced forces
The Harry Potter Book series is sitting on Ms. Meister's bookshelf. Gravity is pulling the book towards the ground with 9.8N of force. The bookshelf is pushing the books up with 9.8N of force. What is the net force? Will the books move?
Net Force = 0 N
The books will not move.
Draw a motion graph on your white board that represents the following scenario:
A student walks at a constant speed to the mailbox, stops there to read the mail, then walks back to their house at a constant speed.
Check whiteboards
A cheetah runs 87 miles in 2.5 hours. What is the average speed of the cheetah? Be sure to include units.
34.8 mph
Katniss Everdeen stretches back her bow and arrow and then releases the arrow, sending it flying through the air. This is an example of a transformation from __________ energy to ___________ energy
potential to kinetic energy
The Matilda Jr. Script sits on Ms. Azcarate's bookshelf after rehearsal. This is an example of what type of forces?
Balanced forces
A man is pushing a large box to the left with 72 N of force. The weight of the box is pushing to the right with 68 N of force. What is the Net Force? Will the box move?
Net force = 4 N
The box will move to the left.
Draw a motion graph on your white board that represents the following scenario:
A track athlete runs at an accelerating pace for 30 seconds, stops to catch her breath for 10 seconds, then walks back to the starting line at a constant speed.
Check whiteboards
An airplane travels 4,162.5 km during a 4.5 hour flight. Calculate the average speed of the airplane. Be sure to include units.
925 km/h