Potential Energy
TRUE OR FALSE.
An object raised above the ground has gravitational potential energy.
TRUE
TRUE OR FALSE.
Kinetic energy is an energy possessed by an object due to its motion.
TRUE
What is the SI unit of work.
Joule (J)
What is the SI unit of power?
W (Watt)
Which formula is used to calculate gravitational potential energy?
PE=mgh
Which formula is used to calculate kinetic energy?
KE = (1/2) mv2
What is the formula used to calculate work.
W=Fd
The formula for power using work and time.
P= W/t
What is the quantity that refers to how high an object is above the ground in gravitational potential energy.
Height (h)
One factor that affects the amount of kinetic energy of an object.
Speed (or Mass)
TRUE OR FALSE.
Work can be done even when the force is perpendicular to the direction of motion.
FALSE
If the work done is constant, what happens to power when time increases?
Power decreases.
In the formula used to calculate the potential enrgy, m,g, and h stands for?
m = mass
g = acceleration due to gravity
h = height
In the formula used to calculate the kinetic enrgy,m and v stands for?
mass and velocity
Work is done when a student pushes a box and the box moves 2 meters. Which factor will increase the work done?
A. Reducing the force applied
B. Reducing the distance
C. Increasing the force applied
D. Removing the box
C. Increasing the force applied
TRUE OR FALSE.
Power depends only on the amount of work done, not on the time.
FALSE
What is the vaue of g or the acceleration due to gravty when solving for the PE?
9.8 m/s²
If the mass of an object increases while its velocity remains the same, what happens to its kinetic energy?
Its kinetic energy increases.
The term used when work is done per unit time.
POWER
A machine does 200 J of work in 5 seconds.
Another machine does 250 J of work in 10 seconds.
Which machine has greater power?
Machine 1:
P=200/5=40 W
Machine 2:
P=250/10=25 W
So, Machine 1 has greater power.