Scalars and Vectors
Scalar or vector?
5 m/s
Scalar
How can we break 2D kinematics into 1D kinematics?
x and y dimensions
What is Newton's 2nd Law?
F = ma
Is momentum conserved during all collisions?
Yes
What is the difference between mass and weight?
Mass doesn't get affected by different gravitational fields
Scalar or vector?
⟨1, 1⟩
Vector
How many dimensions do we consider projectile motion to be in?
2 dimensions
What does Newton's 3rd Law state?
Every action has an equal and opposite reaction
Is kinetic energy conserved during all collisions?
No
What is friction?
A force that opposes motion.
Calculate the magnitude of this vector.
⟨5, 14⟩
√221
How much does gravity accelerate an object?
9.81 m/s^2
If I exert 500 N of force on a wall, how much force does the wall exert on me?
500 N
Which type of collision conserves kinetic energy?
Elastic collision
What greek letter represents the coefficient of friction?
μ, or mu
Given a magnitude of 13 and an angle of 22.62°, calculate the components of the vector.
⟨5, 12⟩
What is the path of a projectile called?
Trajectory
When do objects accelerate?
When a force is applied
How is kinetic energy lost during a collision?
Through heat, sound, light, etc.
How can you calculate sine?
opposite / hypotenuse
Calculate the direction of this vector in degrees. Angle should be positive and round to two decimal places.
⟨-12, 6⟩
153.43°
What is the projectile motion equation in the y dimension?
yf = y0 + vy0 * t - ½ * g * t2
What is the y component of gravity's affect on an object which is on an inclined plane? mass of object = m, angle of inclined plane = θ
mgsin(θ)
What is the equation for conservation of momentum in a collision?
m1v1 + m2v2 = m1v1f + m2v2f
What is kinematics?
The study of how objects move