If you were in a spaceship and fired a high velocity projectile with a railgun into towards an enemy battle cruiser, how much force would have to be exerted on the projectile to keep it moving once it has left the spaceship?
New cards
2
it doesnt move with respect to the ground but moves backwards with respect to the wagon
suppose you place a ball in the middle of a wagon, and then accelerate the wagon forward. How does the ball move with respect to the ground and with respect to the wagon
New cards
3
the law of inertia
newton's first law is also known as ________.
New cards
4
non-zero net force
what type of force is needed to change an object's velocity?
New cards
5
all of the above
which of the following can a force do?
- cause an object to begin moving
- cause an object to begin slowing down
- cause an object to change directions
- all of the above
New cards
6
has zero net force
an object following a straight-line path at a constant speed _______________.
New cards
7
true
true or false: an object with zero net force can move
New cards
8
false
true or false: an object must move if a force is applied to it
New cards
9
the resistance an object has to changing it's velocity
inertia is _________________.
New cards
10
newton's first law
"buckle up - its the state law" can be explained by:
New cards
11
no applied force is required to maintain a constant velocity
a spacecraft travels at a constant velocity in empty space far away from any center of gravity. what is true about the force applied on the spacecraft?
New cards
12
the bus slowed down
a passenger is standing in a moving bus, facing forward. the person suddenly falls forward. what happened to the bus?
New cards
13
the bus sped up
a passenger is standing in a moving bus, facing forward. the person suddenly falls backward. what happened to the bus?
New cards
14
the bus turned to the left
a passenger is standing in a moving bus, facing forward. the person suddenly falls to the right. what happened to the bus?
New cards
15
a change in velocity can only occur if an object has a nonzero net force applied to it
newtonn's first law states
New cards
16
both
a student on a moving school bus watches another student walk to the back of the bus + measures a distance of 5 m. someone standing still outside of the bus also sees the student walking + measures a distance of 40 m. who’s correct?
New cards
17
all of the above
what is an inertial reference frame?
- frame of view when the viewer is moving at a constant velocity
- frame of view when the viewer is not moving
- frame of view where the viewer is not rotating
- all of the above
New cards
18
parabola
the path of an object dropped from a moving vehicle will look like a _________ to an outside observer.
New cards
19
no, but we live here so we treat it like one
is the earth an inertial reference frame?
New cards
20
a ball spinning on a person's finger
which of the following is NOT and inertial reference frame
Studied by 1 person
