1. What is potential energy?
2. What is kinetic energy?
1. the stored energy that an object has due to its position, condition, or chemical composition.
2. energy of motion
100
True or False?
1.Does motion describe the location of an object?
2.Speed of an object is rarely constant.
1.False
2.True
100
Do balanced forces change motion?
NO
100
What is the formula for weight?
F=mg
M is mass
G is gravity
100
What is an investigation?
A procedure that is carried out in order to observe a response; NOT a complete experiment.
200
Which has more gravitational potential energy: a bird on the ground, or the same bird in a tree.
a bird in a tree
200
What is a location to which you compare other locations?.
A reference point
200
When does a force on an object unbalanced?
When the net force is not 0 N, the force on an object are unbalanced.
200
What is gravity?
a force of attraction between objects due to their mass.
200
What is a variable?
Conditions that change during an experiment.
300
How are kinetic energy and potential energy different?
What energy does a person riding a motorbike have?
Kinetic is the energy of motion and potential is the stored energy. A person riding a motorbike has kinetic energy.
300
A penguin swimming underwater goes 20 meters in 8 seconds.
What is the average speed?
Formula: s=d/t
2.5 m/s
300
What is the result force of an direction if a dog walker experiences a 20 N force pulling her east and another 20 N force pulling her south?
Southeast 40
300
True or False
Does the moon have a diameter of more than 3,400 km?
True
300
What is an experiment?
A procedure that is carried out and repeated exactly in order to discover, or test a hypothesis; includes all components of the scientific
400
1. What does the law of conservation of energy state?
2. What is mechanical energy?
1. It states that energy can be neither created nor destroyed
2. the kinetic energy plus the potential energy due to the positon
400
What is a vector?a velocity?
Vector is a quantity that has both size and direction.
Velocity is speed in a specific direction.
400
When the net force is not __1__ N, the forces on the object are unbalanced, and the object will accelerate in the direction of the __2__.
1. zero
2. net force
400
True or False
Gravity depends on mass
Gravity doesn't depend on distance
True
False
400
What is a control?
A variable (condition) that does not change during an experiment.
500
1. Mechanical energy is the sum of _________________
2. What are 2 factors that determine an object's kinetic energy?
1. kinetic and potential energy.
2. mass and speed
500
What depends on average speed?average velocity?
Speed depends on the total distance traveled along a path.
Velocity depends on the straight-line distance from the starting point to the final point, or the displacement.
500
Use Newton's law:
F=ma
150=(75 kg)(a)
2 m/s
500
Why don't satellites in orbit fall to the ground?
Outer space has low gravity.
500
What is a hypothesis?
A possible explanation in response to a scientific question.