PHY 111 Exam 1 Questions with Verified
Correct Answers
Scalar
A physical quantity that has magnitude only.
Vector
A physical quantity that has both magnitude and direction.
Distance vs. Displacement
Distance is a scalar path length; displacement is a vector change in position.
Average Speed Formula
Total distance divided by total time.
Average Velocity Formula
Total displacement divided by total time (v = Δx / t).
Acceleration Formula
The rate of change of velocity with respect to time (a = Δv / t).
Position-Time Graph Slope
The slope of a position-time graph equals velocity.
Velocity-Time Graph Slope
The slope of a velocity-time graph equals acceleration.
Velocity-Time Graph Area
The area under a velocity-time graph equals displacement.
, Free Fall Acceleration
The downward acceleration of gravity near Earth's surface (g = 9.81 m/s²).
Vector Resolution Components
Ax = A cos θ and Ay = A sin θ relative to horizontal.
Independence of Projectile Motion
Horizontal and vertical motions are completely independent of each other.
Projectile Horizontal Acceleration
Zero m/s² when air resistance is ignored.
Trajectory
The parabolic path taken by a projectile in flight.
Newton's First Law of Motion
An object stays at constant velocity unless acted upon by a net force.
Newton's Second Law Formula
Fnet = m a.
Newton's Third Law of Motion
Action and reaction forces are equal in magnitude, opposite in direction, on different objects.
Kinetic Friction Formula
Fk = µk FN.
Maximum Static Friction Formula
Fs,max = µs FN.
Correct Answers
Scalar
A physical quantity that has magnitude only.
Vector
A physical quantity that has both magnitude and direction.
Distance vs. Displacement
Distance is a scalar path length; displacement is a vector change in position.
Average Speed Formula
Total distance divided by total time.
Average Velocity Formula
Total displacement divided by total time (v = Δx / t).
Acceleration Formula
The rate of change of velocity with respect to time (a = Δv / t).
Position-Time Graph Slope
The slope of a position-time graph equals velocity.
Velocity-Time Graph Slope
The slope of a velocity-time graph equals acceleration.
Velocity-Time Graph Area
The area under a velocity-time graph equals displacement.
, Free Fall Acceleration
The downward acceleration of gravity near Earth's surface (g = 9.81 m/s²).
Vector Resolution Components
Ax = A cos θ and Ay = A sin θ relative to horizontal.
Independence of Projectile Motion
Horizontal and vertical motions are completely independent of each other.
Projectile Horizontal Acceleration
Zero m/s² when air resistance is ignored.
Trajectory
The parabolic path taken by a projectile in flight.
Newton's First Law of Motion
An object stays at constant velocity unless acted upon by a net force.
Newton's Second Law Formula
Fnet = m a.
Newton's Third Law of Motion
Action and reaction forces are equal in magnitude, opposite in direction, on different objects.
Kinetic Friction Formula
Fk = µk FN.
Maximum Static Friction Formula
Fs,max = µs FN.
