Category 1
The unit for work
Joules
In a race, two cars have the same mass but different velocities. The car with the slower velocity has ______ kinetic energy than the other car does.
Less
Materials that allow heat to flow easily
conductor
The amount of work done in a certain time is...
Power
Energy in motion is know as...
Kinetic energy
You move a cart of pumpkins 15 m. This requires a force of 65 N. How much work was done while moving the pumpkin?
975 J
How much energy does a 4 kg apple have that is thrown at a speed of 2 m/s?
8 J
Energy stored in food would be considered
chemical potential
How much power is used if a 100 J or work is done to move a box in 10 s?
10 W or 10 J/s
A 0.9 kg pineapple falls from a tree that is 5.8 m tall. How much energy does the pineapple have?
51.16 J
The two conditions that must be met in order for work to be done.
1. The object must move
2. Force must be applied in the direction of the motion
List the type of potential energy each object below has.
A. Sandwich
B. Trampoline
A. Chemical potential energy
B. Elastic potential energy
An object that has kinetic energy must be
in motion
How long would it take to do 36 J of work if 4 W of power are available?
9 s
How much heat is needed to warm 0.098 kg of gold from 15 degree Celsius to 30 degree Celsius if gold has a specific heat of 136 J/kg C
200 J
A small child weighs 25 N. If they do a somersault and move a distance of 3 m, how much work was done?
75 J
How much potential energy does a bird have that weighs 9 N and is sitting on a branch 3 m high?
27 J
The kinetic energy of an object of an object increases as its _____ increases
speed
Energy stored by objects that are above Earth's surface
Gravitational potential energy
Define thermal energy and mechanical energy
Thermal energy= the sum of kinetic and potential energy of particles in a object
Mechanical energy = the sum of kinetic and potential energy in a system
How far did you push a 12 kg barrel of tools if you did 276 J of work and pushed at a rate of 3 m/s^2?
7.67 m
What is the mass of a picture that falls off a shell 6 m high and has 150 J of energy?
2. 55 kg
Transfer of energy by the movement of heated particles
convection
The total amount of kinetic energy and potential energy of all the atoms in a object
Thermal energy
List 3 types of potential energy
1. Elastic
2. Gravitational
3. Chemical