The work done lifting an object is _____ its change in potential energy
equal to
200
Name the two types of mechanical energy
KE and PE
200
If the same job is done using two different methods and requires the same amount of work, but method A takes half the time of method B, compare the power required for A and B.
power for A is twice the power of B
300
a car slows down on a flat road. is work being done (if so, is it positive or negative)
yes, negative
300
Ball A and ball B are travelling the same speed. Ball A has double the mass of ball B. What is the ratio of KE of A to B
2:1
300
What is the potential energy of a 900 kg roller coaster car that is 20m above the ground?
180,000 J
300
Friction converts kinetic energy to this type of energy
Heat/Thermal
300
If a task takes 100 J of work and is completed in 0.5 s what was the power required?
200 W
400
If the force is 10N up and the displacement is 5m sideways, what is the work done on the object?
0 J
400
A ball has a mass of 0.5 kg and a speed of 4 m/s. What is its KE?
4 J
400
Name one other type of potential energy other than GPE.
Elastic, chemical, nuclear
400
if friction is negligible, then what will be the kinetic energy of an arrow that is shot out of a bow that has a potenital energy of 70 J
70 J
400
If I carry a 2.5 kg box up 3m of stairs in 10s, what was my power?
7.5 W
500
If a 2000 kg car slows down from 10m/s to a stop, how much work was done?
100,000 J
500
If friction is the only force acting on an object will its KE will?
four times greater
500
A 5kg ball 2m off the ground on Earth has 100 J of potential energy. On the moon, the same ball at the same height would have ____________potential energy.
less
500
A 70kg skateboarder starts from rest atop a 4m high ramp. As he drops down, he gains speed. What will his speed be halfway down the ramp?
2.8 m/s
500
a. What type of nuclear reaction is it when atoms are split apart?
b. What type of nuclear reaction is it called when atoms are combined together?