Vocab
This is the rate at which an object changes its speed or direction.
acceleration
30 mph west is an example of ___________.
velocity
A lamp sitting on a table demonstrates which law?
Newton’s first law
According to Newton’s second law, the acceleration of an object depends on its ______________.
mass and net force
For every _______ there is an equal and ________ reaction.
A. motion, opposite
B. action, opposite
C. action, unequal
D. motion, unequal
action, opposite
The acceleration of an object depends on net force and mass of the object.
Newton’s second law
This is the mass of an object if the applied force is 2500 N and the acceleration is 500 m/s/s.
5 kg
Which of the following objects has the most inertia?
A. a pen
B. a ping pong ball
C. a bowling ball
D. a car
a car
Which formula is NOT associated with Newton’s 2nd Law?
A. F = ma
B. m = F/a
C. a = F/m
D. m = a/F
m=a/F
What is Newton’s 3rd Law of Motion?
for every action there is an equal and opposite reaction
This is calculated by multiplying mass by acceleration.
force
This is the force applied to an object if the acceleration is 600 m/s/s and the mass is 300 kg.
180,000 N
What is friction?
When two objects rub against each other at opposite directions
The rate at which an object changes speed is called _______________.
Acceleration
Which of the following examples best represents Newton’s 3rd Law?
A. When riding in a car, your body
lurches to the side after an abrupt
turn.
B. A large truck takes longer to slow
down than a car.
C. Your stomach jumps when you ride a
roller coaster.
D. Pushing water backward with oars
helps paddle a canoe forward.
Pushing water backward with oars helps paddle a canoe forward
For every action there is an equal and opposite reaction.
Newton’s third law
What is the net force acting on a 15 kg sled that accelerates at 5m/s2?
A. 45 N
B. 3 N
C. 75 N
D. 30 N
75 N
What will happen to an object if it is put into motion in space?
A. It will stop eventually due to
friction.
B. It will continue to move until it is
acted on by an unbalanced force.
C. It will speed up over time.
D. It will slow down over time.
It will continue to move until it is acted on by an unbalanced force.
What is the formula to calculate velocity?
You exert 500 N of force down on the earth as you jump into the air. How much force does the earth exert back on you?
A. 0 N, because the earth doesn’t move
down, but you move up.
B. 500 N, because it exerts an equal and
opposite force back on you. It doesn’t
move because it has more mass than you.
C. 1000 N, because you move up, but the
earth doesn’t move down. This must mean
the earth exerts more force on you than
you do on the earth.
500 N, because it exerts an equal and opposite force back on you. It doesn’t
move because it has more mass than you.
An object at rest tends to stay at rest unless acted on by an unbalanced force.
Newton’s first law
Newton’s 1st Law applies to...
A. only moving objects
B. only nonmoving objects
C. both moving and nonmoving objects
D. no objects except those in space
both moving and nonmoving objects
What can be measured by acceleration?
A. How much an object slows down
B. How much an object speeds up
C. If an object changes direction
D. All of the above
all of the above
Which of the following statements about Newton’s 3rd Law is true?
A. An action force is always greater
than its reaction force.
B. A reaction force is always greater
than the action force.
C. Every action force has an equal
reaction force.
D. Not all action forces have reaction
forces.
every action force has an equal reaction force