Kinematics
Explain the difference between distance and displacement.
Displacement is a vector. (direction and magnitude)
Explain the concept of equilibrium in physics.
No Net Force acting on an object.
Net Force = 0 N
Define acceleration in physics.
The rate of change an object experiences in it's velocity over time.
It can be a change in the magnitude of the object's velocity, it's direction, or both.
State Newton's first law of motion.
State Newton's second law of motion.
State Newton's third law of motion.
Law of Inertia- stay in motion or at rest, unless outside force.
F= ma
Action/Reaction
How could you find the vertical component of a vector?
How could you find the horizontal component of a vector?
Ay = A sin θ
Ax = A cos θ
A car travels at 30 m/s for 6 seconds. How far does it go?
180 m
If a book weighs 40 N, what is the magnitude of the force due to gravity when it rests on a table?
40 N
A 5 kg object is subjected to a net force of 20 N. What is its acceleration?
4 m/s2
According to Newton's third law, if you push a wall with a force of 100 N, what is the reaction force?
100 N in the opposite direction
If a projectile is launched with an initial velocity of 40 m/s at an angle of 30 degrees above the horizontal, what is its initial horizontal velocity component? (round to the nearest integer)
35 m/s
If an object starts from 2 m/s and accelerates at 4 m/s² for 5 seconds, what is its final velocity?
22 m/s
A 500 N box is on an incline with a 30-degree angle. Calculate the component of the weight parallel to the incline. (use sin)
250 N
A car accelerates from rest at 3 m/s² for 8 seconds. Calculate the change in velocity.
24 m/s
Explain Newton's second law of motion and provide an example.
f = ma
A ball is thrown perfectly horizontal from a cliff. If it takes 4 seconds to hit the ground, calculate the ball's vertical displacement. (Use g = 9.8 m/s², round to the nearest integer).
-79 m
Define speed and velocity and provide the units for each.
Speed the rate of change for distance over a period of time.
Velocity the rate of change for displacement over a period of time.
m/s
If an object is being push on one side with a 15 N force and the object is not moving, describe the role of friction in this object's static equilibrium.
The force of friction is equal to 15N in the opposite direction. That is why the object is not moving.
Explain how Newton's second law relates force, mass, and acceleration.
How does acceleration change if the force is increased and mass remains the same? How does acceleration change if mass is increased and the force remains the same?
Acceleration is proportional to force.
Acceleration is inversely proportional to mass.
Describe the law of inertia and its connection to Newton's first law. How does it relate to a magicians table cloth trick.
Inertia is tied to mass.
Describe the relationship between horizontal and vertical motion in a projectile.
They are independent of one another.
The only physics quantity they will have in common is time.
Together you can resolve a vector to find additional information about the object's path.
An object is dropped from rest from a height of 100 meters. Calculate the time it takes to reach the ground.
4.5s
If a force of 100 N is applied to the right, and a force of 60 N is applied to the left, what is the net force acting on the object? Is the object in static equilibrium?
40 N to the right.
No, it is in motion.
An object with a mass of 2 kg is moving at a constant velocity of 5 m/s. If there is a 10 N force being applied to its right side, calculate its acceleration and calculate the magnitude of the net force AND the force on the left side of the object.
Acceleration is 0 m/s2.
Net force is 0 N.
The force on the left side is 10 N.
A 200 kg object is moving at a constant velocity. What can you infer about the net force acting on it?
They are in balance with each other.
A soccer ball is kicked at an angle of 45 degrees with an initial velocity of 20 m/s. What is the time it stays in the air and its maximum height above the ground? [Hint: What is Vf at the highest point in an object's parabolic path?] (Round to the nearest integer).
t = 4s
hmax = 10.2 m