2D Motion
Which of the following measurements is NOT a Scalar?
Displacement
What is the difference between speed and velocity?
Speed is a scalar quantity, while velocity is a vector quantity
what is newton's first law
Inertia
Momentum's two formulas are
mass(m) times velocity(m/s)
force(N) times time(s)
What are the formulas of Gravitational Potential energy AND Kinetic energy
GPE: mass(kg) x gravity(9.8m/s) x height(meters)
KE: 1/2(Mass x Velocity squared)
A football was kicked toward the goal. The horizontal component of velocity was 10 m/s and the vertical component was 7 m/s . What is the magnitude of the resultant velocity of the soccer ball?
17 m/s
Displacement is a vector quantity because it includes information about
Magnitude and direction
what is newton's second law?
force
Momentum and ___ are equal
Impulse
What are the formulas for work AND power?
Work(J): Force(N) x Distance(m)
Power(kW): Work(J) divided by Time(s) OR (Force times distance)divided by time
The horizontal acceleration of a projectile is ALWAYS
Zero
What type of graph represents the relationship between velocity and time for an object moving with constant acceleration?
what is newton's third law?
Action & Reaction
A closed system means
the momentum stays the same before and after collision
A 1 kg ball with 8m/s is held at rest at a height of 2 meters above the ground. What is the gravitational potential energy of the ball-Earth system? What is the kinetic energy of the ball?
Potential energy is 19.6 J /20 J
Kinetic energy is 32 J
An athlete leaves the base camp and hikes 10 km, north and then hikes 5 km east. Determine his resulting displacement.
11.2km NE
What does slope (rise/run) equal?
Average velocity
The up thrust and weight act in?
opposite direction
An object has a mass of 100 kg moving at 5 m/s. What is the linear momentum of the object?
500 kg m/s
A motor lifts an elevator 9.0m in 13 seconds. During those 13 seconds the motor uses 8,000N. How much work does the motor do? What's the amount of power does the motor have?
Work: 72,000 J
Power: 5,538.46 kW
An object is shot from the ground at 75m/s at an angle of 45⁰ above the horizontal. How high does the object get before beginning its descent?
140m
Constant velocity and speed means ____ acceleration.
zero
When a person travelling in train toss the coin, if the coin falls behind him, what does it say about the train?
it accelerated
A golf club has 10 kg m/s of momentum when it hits a golf ball that is at rest. After the collision, the golf club has a momentum of 1 kg m/s and the golf ball has a momentum of 9 kg m/s. Which of the following comparisons is TRUE about the change in momentum of the two objects?
The change in momentum is equal and opposite for the two objects
Energy is never created or destroyed because it's always ________.