Exploring Work, Energy, and Power

Which of the following statements best describes the Work-Energy Theorem?

• The work done by all forces acting on a particle equals the change in its potential energy.

• The work done by all forces acting on a particle equals the change in its kinetic energy.

• The work done by all forces acting on a particle equals the change in its total mechanical energy.

• The work done by all forces acting on a particle is zero.

What is the unit of power in the International System of Units (SI)?

• Joule

• Watt

• Newton

• Pascal

Which of the following is an example of potential energy?

• A moving car

• A compressed spring

• A spinning top

• A flowing river

If a force of 10 Newtons is applied to move an object 5 metres, how much work is done?

• 2 Joules

• 15 Joules

• 50 Joules

• 100 Joules

Which of the following equations represents kinetic energy?

What is the principle of conservation of energy?

• Energy can be created and destroyed.

• Energy can be transformed from one form to another, but the total energy remains constant.

• Energy is always lost as heat.

• Energy is only conserved in closed systems.

Which of the following is an application of D'Alembert's Principle?

• Calculating the gravitational force between two masses.

• Analysing the motion of a pendulum.

• Determining the electric field around a charge.

• Solving problems in dynamic equilibrium.

What is the formula for gravitational potential energy?

If a machine does 2000 Joules of work in 10 seconds, what is its power output?

• 20 Watts

• 200 Watts

• 2000 Watts

• 20000 Watts

What is the relationship between work and energy?

• Work is the rate of energy transfer.

• Work is the energy required to maintain a constant velocity.

• Work is the energy transferred to or from an object via the application of force along a displacement.

• Work is the energy lost due to friction.