Kinetic and Potential Energy
Motion and Speed
Acceleration
Forces
Gravity and Motion
100
What is kinetic energy
The energy of motion
100
How is average speed caculated
With distance/time
100
When the acceleration and the velocity go in the same direction this happens
The speed increases
100
The unit that measures the amount of force
What is newtons
100
What speed does gravity pull us down at?
9.8m/s
200
If a car has a mass of 5,000 kilograms and another one has a mass of 5,500 kilograms, then which car has more kinetic energy? Why? (They are both traveling at the same speed.)
The car with the mass of 5,500 kilograms because it has more mass which cause more inertia and this also makes the car travel a long distance without applying brakes after releasing the acceleration pedal. The other car will also have inertia, but travel a less distance.
200
When the line in a graph is in a straight horizontal line what does that mean about the object's motion
It means the object's motion has stopped
200
A decrease in velocity.
What is negative acceleration?
200
What is the net force of a balanced force and how does a balanced force occur?
0 newtons; When two objects are going in opposite direction with the same amount of force
200
True or False: Does gravity make planets round?
True
300
What two does gravitional potential energy depend on?
Height above ground and mass
300
How do you get a velocity of 0
You end up where you started or just go in a circle
300
Acceleration in a circular motion
What is centripetal acceleration
300
Name two forces that act at a distance and an example of a contact force
Gravity and magnitism; Rubbing your hands together (friction).
300
If there was no air resistance which would hit the ground first if they were dropped at the same time: a feather or a marble
Neither; They would hit the ground at the same time
400
What does the law of conservation state?
That matter cant be made or destroyed only changed
400
What is the difference between speed and velocity?
Speed depends on total distance travled and doesnt have a direction; velocity depends on the straight line path from start to finish and has a direction
400
What changes in order for acceleration to occur?
Speed and/or direction of motion
400
What does Newtons first law of inertia state?
"An object at rest stays at rest and an object in motion maintains it velocity unless it experiences an unbalanced force."
400
Why do you weigh more on Jupiter than on Earth
Because Jupiter has more gravity
500
What is mechanical energy?
The objects total amount of kinetic and potential energy
500
What is the average speed of a car that travels 468 meters in 52 seconds.
9m/s
500
What is the average acceleration of a racecar that starts at 17m/s and then after 15 seconds reaches 164m/s? Hint:Use the formula average speed=(final velocity)-(starting velocity) __________________________ time
9.8m/s
500
Why do footprints on the moon stay there for millions of years?
Because there is no force to move the dust to cause erosion
500
Why does the satellite keep its orbit and not fall to earth
Because the satellite has forward motion and a downwards pull which keeps it in orbit
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