A speed-versus time graph for a car's motion is a horizontal line at a speed of 12 m/s. The car's acceleration during this time is (12) m/s^2
False. 0 m/s^2
100
True or False. Balanced forces (do not change) the motion of an object.
True
100
When you push a desk that doesn't move,
A. Sliding friction occurs
B. Static friction occurs
C. Rolling friction occurs
D. Fluid friction occurs
B. Static friction occurs
100
True or false. Newton's first law of motion states that an object will not experience a change in motion unless acted upon by a(n) (balanced) force.
False. Unbalanced or outside
100
The state that exists when the only force acting on an object is gravity is called...
A. Free Fall
B. Inertia
C. Acceleration
D. Momentum
A. Free Fall
200
What is the rate at which the velocity of an object changes? It is the object's rate of _______________.
Acceleration
200
The strength of a force is measured in _______________.
Newtons
200
When you stand on a bathroom scale, it displays the _________ that Earth is exerting on you.
Gravitational Force
200
Newton's third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the _______ direction.
Opposite
200
The word centripetal means...
A. Center seeking
B. Gravitational
C. Continuous
D. Free Falling
A. Center seeking
300
An airplane is accelerating at 8 m/s^2. Each second its speed increases by ________________ m/s. (a number)
8 m/s
300
The net force determines how and if an object will _____________.
Move or accelerate
300
Friction acts in a direction _____________ to the direction of the object's motion.
Opposite
300
Newton's second law of motion stats that an object's acceleration depends on its ____ and on the net force acting on it.
mass
300
The force that causes an object to move in a circle is called __________.
Centripetal Force
400
An airplane is acceleration at -8 m/s^2. The distance the airplane travels each second is (less than, greater than, or equal to) the distance it traveled during the previous second.
less than
400
When two forces act in opposite directions, the object will accelerate in the same direction as the ___________ force.
Greater
400
When the irregularities of one surface come into contact with those of another surface, __________ occurs.
Friction
400
True or False.
If you lean against a wall, the wall pushes back on you with a(n) (weaker) force.
False. Equal
400
Any object that travels around another object in space is a(n) __________.
Satellite
500
An amusement park ride falls straight down for 4 seconds. During this time, the ride accelerates from a speed of 0 m/s to 40 m/s. The rides rate of acceleration during the 4 seconds is ________________ m/s^2
10 m/s^2
500
A force is described by its ___________ and by the direction in which it acts.
Strength
500
The applied force required to push something across a surface ______ as friction increases.
increases
500
The smaller the mass of an object, the ___________ its inertia.
Less
500
If you could turn off a centripetal force, ________ would cause the object to fall off in a straight line.