Work, Energy, Machines

Open Ended

How do machines help make work easier in everyday life?

Open Ended

Describe the conventions used to measure displacement in a spring system.

Multiple Choice

Which of the following statements correctly differentiates between kinetic and potential energy?

• Kinetic energy is energy due to motion, while potential energy is stored energy due to position.

• Kinetic energy is stored energy due to position, while potential energy is energy due to motion.

• Both kinetic and potential energy are forms of stored energy.

• Kinetic energy and potential energy are unrelated.

Open Ended

What is the relation between work and power?

Multiple Choice

What is the physical concept of work?

• The measure of energy transferred to a system by an external force when it acts on the system to move it.

• The amount of force applied to an object.

• The speed at which an object moves.

• The total mechanical energy of a system.

Multiple Choice

Which two factors determine the amount of work done when a force acts on a body?

• The size of the force and the distance moved in the direction of the force

• The mass of the object and the speed of movement

• The temperature and the color of the object

• The shape of the object and the time taken

Fill in the Blank

The formula for work done when the force is applied at an angle is W = Fd ___ θ.

Multiple Select

Which of the following statements are true about the formula W = Fd cos θ?

• It accounts for the angle between the force and direction of motion

• It is used when force is not parallel to the direction of motion

• It can be applied when force and displacement are perpendicular

• It is only valid for constant forces

Multiple Choice

Which formula represents the relationship between the external force applied to a spring and its displacement according to Hooke's Law?

• F = kx

• F = 1/2 kx^2

• F = mg

• F = k/x

Multiple Choice

Based on the graph shown, what type of relationship exists between the external force applied to a spring and its position?

• Linear

• Exponential

• Quadratic

• Inverse

Multiple Select

Which of the following quantities are needed to calculate the work done by an external force on a spring?

• Spring constant

• Displacement

• External force

• Mass

Fill in the Blank

The force exerted by a spring is equal in magnitude but opposite in direction to the force applied to it. Fill in the blank: F_ex = ___ F_ex.

Open Ended

What questions do you have about physical science after today's session?