Kinetic Energy
The energy of an object due to its motion is ______energy
kinetic
When you throw a ball in the air, what force brings it back towards the ground?
gravity
The combination of all forces acting on an object is called _______.
net force
Explain the transformation that takes place when you rub your hands together. (_____ to _____)
mechanical to thermal
What type of energy does friction release?
heat
Kinetic energy_________as speed increases.
increases
Amy is hanging from the monkey bars on the playground. It gets harder and harder for Amy to hold on. What will gravity cause Amy to do?
fall down
Two most common outside forces which affect moving objects.
gravity and friction
When you drop a book on the floor, what happens to its original potential energy?
the potential energy was transferred to kinetic and thermal energy
When the tires of a car rub against a road as the car slows down to stop, heat is produced. What causes this?
Friction
Kinetic energy is proportional to the ____________of an object
Maurice put a toy truck on top of a ramp and let it go. What will gravity cause the truck to do?
roll down the ramp
What does a force cause an object to do?
Forces cause an object to move or change direction.
As the mass of an object moving at a given speed decreases its kinetic energy will ________.
decrease
What does friction cause a rolling ball to do?
slow down and stop
All moving __________have kinetic energy.
objects
This measures how fast something moves, or how far it moves in a given amount of time.
Speed
The more massive an object, the __________effect a given force will have on the object.
Less
Two students sit on a seesaw in a way that makes it balance and not move. When a third person pushes down on one side, that side moves down. What caused the seesaw to move?
The total force increased on the side that was pushed down.
What would happen if there was no friction?
It would be very difficult to stop
The amount of kinetic energy an object has depends on the _________and the speed of the object.
mass
unbalanced forces
The greater the force, the ______________ the change in motion will be.
greater
Students are playing a game of baseball. When the batter swings his bat it collides with the baseball causing what to happen?
Energy transfer from bat to the ball
A force that resists the movement of one surface against another
Friction