Work Done Flashcards
What is the formula for calculating work done?
Work done = Force x Distance
True or False: Work is done when a force moves an object in the direction of the force.
True
Fill in the blank: Work done is measured in ______.
Joules
What unit is force measured in?
Newtons
If a force of 10 N moves an object 5 m, how much work is done?
50 Joules
Multiple Choice: Which of the following is NOT a unit of work? A) Joules B) Watts C) Newton-meters
B) Watts
What happens to the work done if the distance is doubled while the force remains constant?
The work done doubles.
True or False: No work is done if an object does not move despite a force being applied.
True
Fill in the blank: The work done against gravity is equal to the ______ of the object raised.
weight
What is the relationship between work done and energy?
Work done transfers energy.
In the context of work done, what does ‘net force’ refer to?
The total force acting on an object after all other forces are accounted for.
Multiple Choice: If a person lifts a box straight up, what type of energy is increased? A) Kinetic B) Potential C) Thermal
B) Potential
What is the work done when a force acts at an angle to the direction of motion?
Work done = Force x Distance x cos(θ)
True or False: Work done can be negative.
True
Fill in the blank: Work done is zero when the angle between the force and the direction of motion is ______.
90 degrees
If a force of 20 N is applied at an angle of 60 degrees to the horizontal and moves the object 10 m, how much work is done?
100 Joules
What is the significance of the work-energy principle?
It states that the work done on an object equals the change in its kinetic energy.
Multiple Choice: Which scenario involves the greatest work done? A) Lifting a 5 kg box 1 meter B) Lifting a 10 kg box 0.5 meters C) Both A and B
C) Both A and B
What is meant by ‘work done against friction’?
The energy expended to move an object in the presence of friction.
True or False: Work done is independent of the path taken.
False
Fill in the blank: Power is defined as the rate of ______ done.
work
How is power calculated?
Power = Work done / Time taken
What is the SI unit of power?
Watts
Multiple Choice: Which of the following represents the most power? A) 100 Joules in 10 seconds B) 200 Joules in 20 seconds C) 50 Joules in 1 second
C) 50 Joules in 1 second
