Units
What is the base unit for mass?
Kilograms (kg)
What is the equation for kinetic energy?
KE = 1/2mv2
What is the equation for momentum?
p = mv
What is an object's acceleration in free fall?
9.81 m/s2
True or False?
Velocity is scalar.
False
What are the units for velocity?
Meters per second (m/s)
mgh = ?
True or False?
Momentum is a vector.
True
When an object is in free fall, what forces are acting on it?
The force of gravity (Fg) is the only force acting on the object.
Is energy scalar or vector?
Scalar
Newtons (N) are the units for...?
Force
The initial potential energy of an object is 50 J. What is the final kinetic energy of the object?
50 J
If the initial momentum of 2 objects is 6 kg(m/s), what is the final momentum of the objects?
6 kg(m/s)
Name the missing variable:
vf2 = vi2+2[?]d
a (acceleration)
Give an example of a scalar quantity.
Ex: Time, mass, distance, etc.
What are the units for energy?
Joules (J)
What is the work done when a block is pushed 3 meters by a 10N force?
30 J
Change in momentum
Is a car moving at a constant speed in equilibrium?
Yes
What does scalar mean?
A quantity that only has magnitude
kg(m/s) are the units for...?
Momentum
When an object's initial potential energy is 100 J, what is the final kinetic energy when 10 J are converted to heat?
90 J
When the impulse of an object is 70 J and the force is 10 N, what is the time?
7 seconds
A car is travelling at 10 m/s. It accelerates at 5 m/s2 for 4 seconds. What is the car's final velocity?
vf = 10 m/s + (5 m/s2)(4 s)
vf = 30 m/s
What does vector mean?
A quantity that has both magnitude and direction