2nd 9 Weeks Test Review

Front

What is the definition of work in physics?

Back

Work is done when a force causes an object to move in the direction of the force.

Front

True or False: Work is done when a weightlifter holds a barbell still above his head.

Back

False

Front

What does a velocity vs. time graph indicate when the line is above the time axis?

Back

The object is moving in the positive direction.

Front

What two factors does gravitational potential energy depend on?

Back

Height and mass.

Front

At which point is potential energy greatest in a gravitational field?

Back

At the highest point (e.g., point W).

Front

What is kinetic energy associated with?

Back

Speed.

Front

What is the formula for calculating gravitational potential energy?

Back

Potential Energy (PE) = mass (m) × gravitational acceleration (g) × height (h).

Front

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

Back

Joule (J).

Front

How does friction affect kinetic energy?

Back

Friction converts kinetic energy into thermal energy, reducing the total kinetic energy of the system.

Front

What is the relationship between mass and kinetic energy?

Back

Kinetic energy increases with mass; doubling the mass of an object doubles its kinetic energy if speed remains constant.