Electric and Magnetic Forces
A balloon with static electric charge is placed near a student’s hair, making it stand up. What would increase the attractive force that the balloon exerts on the student’s hair?
Increasing the strength of the charge on the balloon (Rubbing the balloon longer).
What is Kinetic Energy?
Energy in Motion
If a skater starts at point A on a frictionless track, what is the highest point they will reach?
Point C on the track.
What is Potential Energy?
Stored energy an object has because of its position or state.
What force is needed to make the ends of two magnets, marked "N," touch?
The magnets need to be pushed together.
Doubling the mass of a moving object has a (greater/less) effect on its kinetic energy than doubling the speed.
Less
The skater's kinetic energy is (greater/less) at point B?
Greater
True or False:
Throwing a frisbee back into a tree increases the system’s potential energy.
True
When two magnets are pulled apart, what happens to the force between them?
A) Increase
B) Decrease
Decrease
Looking at the graph, the kinetic energy of a 20 gram ball is (half/double/the same as/quadruple) the kinetic energy of the 10 gram ball.
Double
Explain the types of energy transformations of the skater from point A to point C.
Potential energy at A is transformed into kinetic energy at B and then back into potential energy at C.
As a frisbee falls from a tree, what happens to its Kinetic and Potential energy?
The kinetic energy increases and the potential energy decreases.
True or False:
Electric and magnetic forces can be attractive.
True
Looking at the graph, the kinetic energy of the ball thrown at 20 meters per second is (half/double/the same as/quadruple) the kinetic energy of the ball thrown at 10 meters per second.
Quadruple
What is the difference between Energy Transformation and Energy Transfer?
Energy Transformation is when energy changes from one form to another form of energy.
Energy Transfer is the movement of energy from one location to another through force.
What causes the change in potential energy when a frisbee is thrown into the tree?
The person throwing the frisbee gives it kinetic energy.