Since potential energy and kinetic energy are calculated differently, they must
ID: 1290272 • Letter: S
Question
Since potential energy and kinetic energy are calculated differently, they must have different units.
True
False
An object with a 1.56 kg mass moves with a velocity of 14.29 m/s. What is the object's kinetic energy in joules?
An object with a 1.73 kg mass is 0.56 m above the ground. What is the object's potential energy in joules?
(Consider the ground as height = 0)
Gravitational potential energy can be converted to kinetic energy and vice versa.
True
False
Gravitational potential energy can be positive, negative, or zero depending on height measurement.
True
False
What is the SI unit for kinetic energy?
N (Newton)
J (Joules)
W (Watts)
m (meters)
After we obtain data, _______
We will manually calculate potential and kinetic energy of the cart.
We will transfer data into Excel for automatic calculation.
We will use built-in functions in Datastudio for calculation.
For the motion sensor to work properly, an object must be placed at least ______ away from it.
30 cm
40 cm
50 cm
60 cm
N (Newton)
J (Joules)
W (Watts)
m (meters)
After we obtain data, _______
We will manually calculate potential and kinetic energy of the cart.
We will transfer data into Excel for automatic calculation.
We will use built-in functions in Datastudio for calculation.
For the motion sensor to work properly, an object must be placed at least ______ away from it.
30 cm
40 cm
50 cm
60 cm
Explanation / Answer
PE and KE are both each in Joules
1. KE = 1/2 m v^2 = 1.56 kg * (14.29 m/s)^2 / 2 = 159 kg m^2 / s^2 = 159 Joules
2. PE = m g h = 1.73 kg * 9.8 m/s^2 * .56 m = 9.5 kg m^2 / s^2 = 9.5 Joules
1. True Dropping an object from height converts PE to KE.
1.. True PE = m g h
If PE is measured from the top of a building (taken as zero h) then the PE
on the ground is negative.
2. SI unit for KE and PE is Joules (kg m^2 / sec^2)