Show:
definitions
definitions
definitions
Questions
NJ Ask
100
a change in an objects speed or direction
What is acceleration
100
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 newtons third law of motion
100
why does the ball stop?
Friction from the ground makes the ball stop moving
100
which of the following is a contact force?
B 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 apposing 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 a non contact force
200
Suppose you are playing baseball and hit a home run. What forces slow down the ball while its in motion?
An object in motion stays in motion until acted on by another force
200
In which situation are the forces acting o the object balanced
C
300
a push or pull that causes something to change its motion
What is force
300
the metric unit used to measure force or a 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?
the gravity would slow the ball down
300
Which of the following best describes the motion of an object
D
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 doing what it is doing
What is newtons first law of motion
400
Goes faster Goes slower Changes direction
scooter going down hill car pressing on a break turning a car
400
Is her acceleration positive or negative?
Her acceleration is negative because she is going against the force of gravity
400
Which of the following best describes the force that the car exerts on Sean?
A
500
a force that acts without physical contact to pull two objects toward eachother
What is gravity
500
the exceleration of an object is related to the net force acting on it and then mass of then objects
What is newtons second law of motion
500
Dave is driving down the street. If Dave steps on the brakes, what force slows his car.
the friction of the ground and the tires
500
What is the value of her acceleration during this time?
Her speed is 0 meters per second because she is going at a constant speed
500
Which of the forces has the greatest influence of the structure of solar systems and galaxies
C