Work and Energy in Physics

Mr. Anderson's video on the work-energy principle explains the concepts of work and energy, focusing on kinetic energy. He demonstrates the equivalence between work and kinetic energy, using examples like a baseball pitch. The video covers qualitative analysis of energy changes, the impact of force direction on work, and practical calculations using trigonometry. Viewers learn to predict changes in kinetic energy and calculate work done on objects.

What is the primary type of energy discussed in this video?

• Kinetic energy

• Chemical energy

• Thermal energy

• Potential energy

How is work defined in the context of physics?

• The mass of an object

• Energy stored in an object

• Force applied over a distance

• The speed of an object

In the example of a baseball, what provides the kinetic energy to the ball?

• The work done by the pitcher

• The air resistance

• The speed of the ball

• The mass of the ball

What happens to the kinetic energy of an object when a positive work is done on it?

• It becomes zero

• It remains the same

• It increases

• It decreases

If a net force is applied in the opposite direction of motion, what happens to the object's kinetic energy?

• It increases

• It decreases

• It remains constant

• It doubles

When a force is not aligned with the direction of motion, which component of the force does work?

• The parallel component

• The perpendicular component

• No component does work

• The total force

How do you calculate the work done when a force is applied at an angle?

• Using the tangent of the angle

• Using the secant of the angle

• Using the sine of the angle

• Using the cosine of the angle

What is the work done on a cart if a 7.1 Newton force is applied over 18 meters?

• 127.8 Joules

• 12.8 Joules

• 1.3 Joules

• 0.39 Joules

If a force of 9.6 Newtons is applied at a 32° angle, what trigonometric function helps find the effective force?

• Sine

• Cosine

• Tangent

• Cotangent

What is the relationship between work done on an object and the energy it gains?

• Work has no relation to energy gained

• Work is equal to the energy gained

• Work is always less than energy gained

• Work is always greater than energy gained