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the combination of all the forces acting on an object
net force
the resistance to motion created by two objects moving against each other
friction
Define Friction
the resistance to motion created by two objects moving against each other
the measure of motion
speed
how fast an object is moving
speed
A ball is lying on the floor. When will the ball move?
When a force acts on it.
What must be applied to push or pull an object?
force
What will happen when a light-weight object and a heavy object run into each other?
The small (lighter) object bounces backwards.
moving a shopping cart foward is using what force?
push
How will the batter change the force on the baseball?
direction changes
If you wish to kick a soccer ball to go as far as possible, what should you do?
Kick it very hard.
Provide an example of kinetic energy
Possible answers: kicking a soccer ball, jumping rope
objects in motion have
kinetic energy
A student rolls a soccer ball on the ground. Which of these causes the soccer ball to slow down and then stop?
friction from the ground
Would a piano or a feather take more force to move? why?
the piano has a larger mass
Potential Energy
an object at rest
