Work
How much work is done on a 60-N box of books that you carry horizontally across a 6-m room?
0 j
The unit for power is called the
Watts
What are the two types of potential energy
EPE and GPE
If friction is negligible, the what will be the kinetic enregy of an arrow that is shot out of a bow that has a potenital energy of 70 J?
70 J
Calculate the speed of a 5.2-kg object that possesses 26.1 J of kinetic energy.
3.17 m/s
A 15-kg cart is moving with a velocity of 7.50 m/s down a level hallway. A constant force of 10 N acts on the cart, and its velocity becomes 3.20 m/s. A) How much work is done on the cart?
This happens to power when you increase time.
your power will decrease
As a spring is stretched, its elastic potential energy
increases
The diagram below shows a moving, 5.00-kilogram cart at the foot of a hill 10.0 meters high. For the cart to reach the top of the hill, what is the minimum kinetic energy of the cart in the position shown?
500 J
Calculate the kinetic energy of a 5.2-kg object moving at 2.4 m/s
14.975 J
A 4.1-kg box of books is lifted vertically from rest a distance of 1.6 m by an upward force of 60 N. Find (A) The work done by the applied force (B) The work done by gravity (C) The total work (D)
96 J
-65.6 J
30.4 J
If I do 2000 Joules of work in 5 seconds, I produce this amount of power.
What is 400 watts.
An astronaut is elevated 100 m above the ground on Earth while another astronaut is 100 m above the surface of the moon. Which astronaut has more potential energy?
The one on Earth
The diagram below shows a toy cart possessing 16 joules of kinetic energy traveling on a frictionless, horizontal surface toward a horizontal spring. If the cart comes to rest after compressing the spring a distance of 1.0 m, what is the spring constant of the spring?
32 n/m
If I double an objects velocity, I do this to my kinetic energy.
What is quadruple Kinetic Energy /KE becomes 4 times as big.
If Nellie Newton pushes an object with twice the force for twice the distance, she does_______ work
4 times more
Power is defined as the
Work done on an object divided by the time taken to do the work
Calculate the potential energy of a 5.2-kg object positioned 5.8 m above the ground.
301.6 J
A 1.6 kg block slides with a speed of .95 m/s on a frictionless, horizontal surface until it encounters a spring with a spring constant of 902 N/m. How much does the spring compress when the block comes to rest?
.04 M
A hot wheels car is moving down a ramp with friction. The potential energy the car started with is now these types of energy.
What is Kinetic Energy and Thermal/Heat Energy
A student pulls on a cart and applies a 20-N force at an angle of 25 degrees above the horizontal to move a crate a distance of 10 m across a rough floor. with a frictional force of 2 N
Answer the following questions
Draw a FBD, How much work does the student do. What is the total work done.
181.26 J
161.26 J
To pass a slow-moving truck, you want your car which has a mass of 1,300 kg to accelerate from 13.4 m/s to 17.9 m/s in 3 seconds. What is the required power for this pass?
30,517.5 Watts
Which situation describes a system with decreasing gravitational potential energy?
a) A girl stretching a horizontal spring
b) A boy jumping down from a tree limb
c) A rocket rising vertically from Earth
d) A bicyclist riding up a steep hill
D
A block of mass 2 kg slides on a frictionless loop the loop track. The block is released from a height of 3.7 m. The loop the loop track has a radius of .8 m
8.6 m/s
If the velocity of an object triples its KE will be ____ times greater.
9 times