Newton's Laws
What is Newton's first law
An object in motion remains in motion until an outside force acts on it. An object remains at rest until another force acts on it.
What is a scalar?
A quantity of magnitude
If an object is fired from rest, what is the initial velocity in the y direction
0 m/s
What is the gravitational acceleration on the Earth?
9.81 m/s^2
Standard units for distance?
Meters (m)
What is Newton's third law?
Every action has an equal an opposite reaction
What is a vector?
A quantity that has both magnitude and direction
After an object has been fired and is in the air, what is the direction of acceleration?
Down (gravity)
Is acceleration constant as an object is falling?
Yes! (the velocity increases not acceleration)
Standard units for velocity?
Meters/second (m/s)
What is Newton's second law?
Acceleration is proportional to the total force acting on an object (more force = greater acceleration)
Is distance a scalar or a vector?
Scalar
What angle above the horizontal will make the object go the furthest when fired?
45 degrees
What is the gravitational acceleration on the moon?
1.62 m/s^2
Units for force?
Newtons (N)
Someone falls to the ground but they don't fall through the floor, what law explains why this is?
Newton's third law; the floor pushes back with an equal force
Which of the following is a vector?
A) Time
B) Speed
C) Momentum
D) Energy
C) Momentum
What angle above the horizontal will make an object spend the most amount of time in the air when fired?
90 degrees
Two objects are attracted to one another. If the mass of one of the objects is doubled, what happens to the force of attraction between the objects?
It is doubled
Units for energy?
Joules (J)
What is the total force if a 5 kg object accelerates at 2 m/s^2
10 N
Which two are scalars?
A) Time and velocity
B) Work and mass
C) Speed and displacement
D) Momentum and energy
B) Work and mass
How far would an object travel if its initial horizontal velocity is 5 m/s and it is in the air for 0.5 seconds?
2.5 m
Two objects are attracted to one another by a force. If the mass of both objects doubles, and the distance between them doubles, what happens to the force of attraction?
It remains the same
Units for momentum?
Kilograms per meters/second (kg * m/s)