9. Work & Energy

Intro to Calculating Work

Multiple Choice
In introductory physics, the product of a force acting over a displacement is the definition of which quantity?
Multiple Choice
In introductory physics, the use of force to move an object through a displacement is called what quantity?
Multiple Choice
In introductory physics, the product of a force acting over a distance in the direction of the force is the definition of what quantity?
Multiple Choice
How much work is done when a constant force of $60 N$ is used to pull a sled a distance of $5 m$ in the direction of the force?
48
views
Multiple Choice
You pull a 5kg box vertically up with a constant 100N force for 2m. How much work do you do?
2860
views
59
rank
4
comments
Multiple Choice
You push a 3kg box against a wall for a distance of 2m with a force of 40N that makes a 53° angle with the horizontal, as shown. Calculate the work done by gravity.

2395
views
53
rank
9
comments
Multiple Choice
A $1000 kg$ pallet of bricks is being lowered to the ground by a crane. If the bricks are moving at a constant speed, how much work is done by the cable on the bricks as they descend $11 m$ ?
592
views
Multiple Choice
A particle of mass $250 g$ moving along the x axis has velocity $v_{x} = (7.6 x^{3}) m / s$ with x measured in m. How much work is done on the particle as it moves from $x = 0.0 m$ to $x = 2.0 m$ ?
771
views
Textbook Question
A factory worker pushes a $30.0$ -kg crate a distance of $4.5$ m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is $0.25$ . What is the total work done on the crate?
1320
views
Textbook Question
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of $1.80 \times 10^{6}$ N, one $14 degrees$ west of north and the other $14 degrees$ east of north, as they pull the tanker $0.75$ km toward the north. What is the total work they do on the supertanker?
1942
views
Textbook Question
A factory worker pushes a $30.0$ -kg crate a distance of $4.5$ m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is $0.25$ . How much work is done on the crate by the normal force? By gravity?
2547
views
1
rank
Textbook Question
A factory worker pushes a $30.0$ -kg crate a distance of $4.5$ m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is $0.25$ . How much work is done on the crate by this force?
2223
views
1
rank
Textbook Question
A factory worker pushes a $30.0$ -kg crate a distance of $4.5$ m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is $0.25$ . What magnitude of force must the worker apply?
4390
views
Textbook Question
A factory worker pushes a $30.0$ -kg crate a distance of $4.5$ m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is $0.25$ . How much work is done on the crate by friction?
1051
views
Textbook Question
A 55.0-kg firefighter climbs a flight of stairs 28.0 m high at constant speed. How much work does she do?
859
views