work, energy and power

Question 1

What is the formula for work done?

Answer 1

Work done = Force x Distance x cos(θ)

Question 2

True or False: Work done is a scalar quantity.

Answer 2

True

Question 3

Fill in the blank: The unit of work done is ______.

Answer 3

Joule

Question 4

What is the relationship between work and energy?

Answer 4

Work done on an object results in a change in energy.

Question 5

Multiple Choice: Which of the following is NOT a unit of power? A) Watt B) Joule C) Horsepower D) Newton

Answer 5

D) Newton

Question 6

What is the formula for power?

Answer 6

Power = Work done / Time taken

Question 7

True or False: Power is defined as the rate at which work is done.

Answer 7

True

Question 8

Fill in the blank: The SI unit of power is ______.

Answer 8

Watt

Question 9

What is kinetic energy?

Answer 9

The energy an object possesses due to its motion.

Question 10

What is the formula for kinetic energy?

Answer 10

Kinetic Energy = 1/2 mv²

Question 11

Multiple Choice: Which of the following describes gravitational potential energy? A) Energy due to motion B) Energy stored due to position C) Energy of deformation D) None of the above

Answer 11

B) Energy stored due to position

Question 12

What is the formula for gravitational potential energy?

Answer 12

Gravitational Potential Energy = mgh

Question 13

True or False: Energy can be created and destroyed.

Answer 13

False

Question 14

Fill in the blank: The principle of conservation of energy states that energy cannot be ______.

Answer 14

created or destroyed

Question 15

What is the work-energy principle?

Answer 15

The work done on an object is equal to the change in its kinetic energy.

Question 16

Multiple Choice: If the force applied to an object is in the same direction as the displacement, what is the value of θ in the work formula? A) 0° B) 90° C) 180° D) 45°

Answer 16

A) 0°

Question 17

What does it mean if work done is negative?

Answer 17

The force applied is in the opposite direction to the displacement.

Question 18

Fill in the blank: The total mechanical energy of an object is the sum of its ______ and ______.

Answer 18

kinetic energy, potential energy

Question 19

What does a watt measure?

Answer 19

A watt measures the rate of energy transfer equivalent to one joule per second.

Question 20

True or False: If no work is done on an object, its energy remains unchanged.

Answer 20

True

Question 21

What is the formula to calculate the work done against gravity?

Answer 21

Work done = mgh

Question 22

Multiple Choice: Which factor does NOT affect the amount of work done? A) Force applied B) Distance moved C) Direction of motion D) Time taken

Answer 22

D) Time taken

Question 23

What is elastic potential energy?

Answer 23

The energy stored in an object when it is compressed or stretched.

Question 24

What is the formula for elastic potential energy?

Answer 24

Elastic Potential Energy = 1/2 kx²

Question 25

Fill in the blank: The work done by a constant force can be calculated using the area under the ______ vs. distance graph.

Answer 25

Force

Question 26

True or False: Power is a vector quantity.

Answer 26

False

Question 27

What is the effect of friction on work done?

Answer 27

Friction reduces the amount of work done by opposing the motion.

Question 28

Multiple Choice: In a closed system, energy can be ______. A) Created B) Destroyed C) Transformed D) None of the above

Answer 28

C) Transformed

Question 29

What is a practical example of power?

Answer 29

The rate at which a light bulb converts electrical energy into light.

Question 30

Fill in the blank: In physics, energy is often classified into ______ forms.

Answer 30

various

Question 31

What is the relationship between force, distance, and work done?

Answer 31

Work done is directly proportional to the force applied and the distance moved in the direction of the force.