Worksheetswork and energy
Total questions: 31
Worksheet time: 27mins
When is work done on a system?
when an object moves a distance
when a force is applied
when a force is applied through a displacement
when an object is at rest
Why would a star do no work on a planet that travels in uniform circular motion around it?
There is no force component parallel to the motion.
There is no displacement of the planet.
The planet does not accelerate.
The star does not exert a force on the planet.
what is your favorite subject ?
math
physics
English
biology
What is the ability of an object to produce a change in itself or the world around it?
power
force
work
energy
Which is the rate at which energy is transformed?
energy
work
force
power
A child holding onto a string attached to a toy boat exerts a force of 8.0 N to pull the boat a distance of 7.2 m along a straight shoreline. If the child holds the string at a 15.0° angle with the horizontal, how much work does she do on the toy boat?
14 J
56 J
58 J
71 J
The weight of a bicyclist and a bicycle together is 53.0 kg. The bicyclist is riding along a straight, level path. How much work is done on the system if the bicyclist slows the bicycle from a speed of 3.84 m/s to 1.27 m/s?
A. 68.1 J
136 J
348 J
696 J
A boy lifts a stack of six identical books from the floor to a 1.2-m high shelf in 2.5 s. If lifting the books requires 50.8 W of power, what is the mass of each book?
1.8 kg
0.88 kg
1.1 kg
2.9 kg
How much work does the force of gravity do on a 5.45-kg bowling ball that falls a distance of 0.755 m?
71.2 J
40.3 J
262 J
4.11 J
A student lifts a box of books that weighs 215 N. The box is lifted 1.75 m. What is the change in energy of the box?
A. 38.4 J
376 J
225 J
123 J
1. The work-energy theorem states that __________.
when a machine works at 100 percent efficiency, the energy of the system remains constant
when work is done at a rate of one joule per second, the power produced is one watt
when work is done on an object, a change in kinetic energy results.
effort is required to resist a change in the energy of a system
__________ is the rate of doing work.
Energy
Power
force
Effort
Any object that has energy has the ability to produce a change in ____.
itself
the world around it
both itself and the world around it
neither itself not the world around it
Two factors that determine work are
force
acceleration
mass
distance
velocity
units of force are
newtons
grams
joules
meters
units for work are
newtons
joules
meters
seconds
if you push a cart with a force of 60 N for 2 m... how much work have you done
120 J
30 J
120 N
30 N
Fred kicks a ball with a force of 20N to George, who is 5m away. How much work was done to the ball?
25J
100J
4J
75J
If Jay Loppy pushes his van 20 meters how much work is done?
2,000J
40,000J
10,000J
800,000J
What is the ability of an object to produce a change in itself or the world around it?
power
force
work
energy
If the external world does work on a system, the ____.
amount of work done on the system has a negative value
energy of the system decreases
energy of the system increases
external world becomes warmer
In which of the following situations is work done on a rock by a gravitational force?
carrying the rock across the yard
dropping the rock
picking up the rock
pushing the rock across the driveway
Which of the following items relates to power but not to work?
distance
force
mass
time
An object has kinetic energy because of its motion and mass.
true
false
When a constant force acts at an angle to the direction of motion, the equation W = Fd sin q is used to calculate the work done on the object.
true
false
The work done by friction has a positive value.
true
false
One way to calculate power is to multiply force by velocity.
true
false
What is the ability of an object to produce a change in itself or the world around it?
power
force
work
energy
The graph between force F
acting on a body and the distance covered by the body is shown in the figure. When the distance covered by the body is 4m , Find the change in kinetic energy
80 J
40 J
20 J
O J
Any object that has energy has the ability to produce a change in ____.
itself
the world around it
both itself and the world around it
neither itself not the world around it
