PS Unit 5 Review

Front

What factors does thermal energy depend on?

Back

Thermal energy depends on an object's mass, phase (solid, liquid, gas), and temperature.

Front

What is the ideal mechanical advantage of a third-class lever?

Back

The ideal mechanical advantage of a third-class lever is always less than 1.

Front

How do you calculate work done when lifting an object?

Back

Work (W) is calculated using the formula W = force (F) × distance (d). For example, lifting a box with a force of 10.0 N over a distance of 0.9 m does 9.0 J of work.

Front

What is the formula for gravitational potential energy?

Back

Gravitational potential energy (PE) is calculated using the formula PE = mass (m) × gravity (g) × height (h). For a 4 kg cat at 3 m high, PE = 4 kg × 9.8 m/s² × 3 m = 118 J.

Front

What is mechanical energy?

Back

The sum of kinetic and potential energy of an object is called its mechanical energy.

Front

Define kinetic energy.

Back

Kinetic energy is the energy of an object due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

Define potential energy.

Back

Potential energy is the stored energy of an object due to its position or state, commonly gravitational potential energy.

Front

What is the relationship between work and energy?

Back

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

Front

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

Back

The unit of work is the Joule (J).

Front

What is the significance of the lever's mechanical advantage?

Back

The mechanical advantage of a lever indicates how much easier it is to lift a load compared to lifting it directly.