the tendency of objects to keep doing what they are doing
What is inertia
100
for every action, there is an equal and opposite reaction
What is Newton's third law of motion
100
gabe kicked a soccer ball across a field. the ball rolled for a while but eventually stopped. If Newton's first law is true, it seems that the ball Gabe kicked should continue rolling on forever. Why does the ball stop?
What is friction from the ground slows the ball down when kicked
100
which of the following is an example of contact force?
-electricity
-friction
-gravity
What is friction
200
a force that must touch an object to change its speed and/or direction
What is contact force
200
the amount by which the opposing forces acting on an object are unequal
What is net force
200
a force that acts on an object to change its speed or direction from a distance
What is noncontact force
200
suppose you were playing baseball and hit a home-run. What forces slow down the ball while it is in motion?
What is friction from the ball and gravity slows the ball down
200
in which situation are the forces acting on the object balanced?
-a car turns a corner at a constant speed
-a minivan slows as it approaches a stoplight
-a hot-air balloon rises at a constant speed
What is a hot-air balloon rises at a constant speed
300
a push or pull that causes something to change its motion
What is force
300
the metric unit used to measure force or weight
What is newton
300
the force that pushes up to support the weight of an object
What is normal force
300
if you hit a home-run in space, what would happen?
What is it will keep going until it hits something (star, sun, etc.)
300
the net force acting on an object is 0 Newtons. which of the following best describes the motion of the object?
-the object is not moving
-the object is moving in a straight line at a constant speed
-the object is slowing down
-the object's motion is not changing
What is the object's motion is not changing
400
a force that occurs when two things move past each other and rub together
What is friction
400
if the forces acting on an object are balanced, the object will continue what it is doing
What is Newton's first law of motion
400
object's resistance to change in motion
What is the law of inertia
400
suppose sharon rides her bike at a total 10 m/s. as she rides up a hill, her speed decreases to 5 m/s. Is her acceleration positive or negative?
What is negative because the force of gravity is acting on you
400
Sean pushes a parked car with a force of 80 Newtons. the car doesn't move. which of the following best describes the force that the car exerts on Sean?
-the same amount of force as Sean exerts
-no force
-more force than Sean exerts
What is the same amount of force as Sean exerts
500
a force that acts without physical contact to pull two objects toward each other
What is gravity
500
the acceleration of an object is related to the net force acting on it and the mass of the object
What is Newton's second law of motion
500
unit meters per second or m/s2
What is express acceleration
500
now suppose sharon rides her bike down the street in 20 seconds. during this time, her speed remains constant at 5 m/s. what is the value of her acceleration during this time?
What is riding a bike at a constant speed is balanced at 0 m/s
500
which force has the greatest influence on the structure of solar systems and galaxies?