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
When do you subtract forces?
When the forces are in opposite directions
When do you add forces together?
When the forces are in the same direction
A pencil falls off a desk that is 1.5 meters tall. If the pencil had a speed of 3 m/s, then how long did it take for the pencil to reach the ground?
.5 seconds
Potential or Kinetic: A car parked in a parking lot
Potential
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
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
What element contains 37 protons and 1 valence electron?
Rubidium(Rb)
When would a skateboarder have the most potential energy? (at the top, bottom, or middle of the hill)
The top of the hill
Potential or Kinectic: A football player throws a football.
Kinetic
Two liquids are added together in a beaker. A precipitant is formed. What kind of change is this?
A chemical change
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed.
Potential or Kinetic: A pencil falls off the desk.
Kinetic
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.
A quartback throws a football 25 yards in 2.6 seconds. How fast was the football going?
9.6 yds/sec
What is the energy of motion?
Kinetic energy
A car speeding up or slowing down is an example of what?
Acceleration
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