What is the energy of motion?
Kinetic energy
A train travels 25 km in .5 hrs. How fast is the train going?
50 km/hr
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 definition of force?
A push or pull on an object
When do you add forces together?
When the forces are in the same direction
The chemical equation for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
1
When would a skateboarder have the most potential energy? (at the top, bottom, or middle of the hill)
The top of the hill
A car speeding up or slowing down is an example of what?
Acceleration
Potential or Kinetic: A quartback throwing a football.
Kinetic
What element contains 37 protons and 1 valence electron?
Rubidium(Rb)
When do you subtract forces?
When the forces are in opposite directions
What is the formula for speed?
Speed= Distance/Time
Two liquids are added together in a beaker. A precipitant is formed. What kind of change is this?
A chemical change
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 car parked in a parking lot
Potential
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed.
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