Two liquids are added together in a beaker. A precipitant is formed. What kind of change is this?
A chemical change
A train travels 25 km in .5 hrs. How fast is the train going?
50 km/hr
What is the difference between the velocity and the speed of an object?
Velocity has a direction associated with it, while speed has no specific direction.
Potential or Kinetic: A pencil falling off a desk
Kinetic
When do you add forces together?
When the forces are in the same direction
During a game of tug-a-war, neither team is able to make any advance. What can be assumed about the forces?
The forces are balanced
Potential or Kinetic: A quartback throwing a football.
Kinetic
What is the formula for speed?
Speed= Distance/Time
Potential or Kinetic: A car parked in a parking lot
Potential
2 students are working to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table. If the force of friction resisting the student’s push is 4 N, what is the net force acting on the board?
6 N
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed.
What element contains 37 protons and 1 valence electron?
Rubidium(Rb)
A car speeding up or slowing down is an example of what?
Acceleration
The chemical equation for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
1
What is the definition of force?
A push or pull on an object
When would a skateboarder have the most potential energy? (at the top, bottom, or middle of the hill)
The top of the hill
What is the energy of motion?
Kinetic energy
When do you subtract forces?
When the forces are in opposite directions
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