AP Physics C: Unit 3 Practice MC (Shortened)

Front

What is the formula for calculating average power?

Back

Average power (P) is calculated using the formula: P = \frac{W}{t}, where W is work done and t is time.

Front

Define work done by a force at an angle.

Back

Work done (W) by a force (F) at an angle (θ) is given by: W = Fd \cos(θ), where d is the distance moved in the direction of the force.

Front

What is the relationship between kinetic energy and speed?

Back

Kinetic energy (KE) is given by the formula: KE = \frac{1}{2}mv^2, where m is mass and v is speed.

Front

How does potential energy change with height?

Back

Potential energy (U) increases with height (h) and is given by: U = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the principle of conservation of mechanical energy?

Back

The principle states that in the absence of non-conservative forces, the total mechanical energy (kinetic + potential) of an object remains constant.

Front

How do you calculate the speed of a pendulum at its lowest point?

Back

At the lowest point, the speed (v) can be calculated using energy conservation: mgh = \frac{1}{2}mv^2, leading to v = \sqrt{2gh}.

Front

What is the coefficient of friction?

Back

The coefficient of friction (μ) is a dimensionless scalar value that represents the frictional force between two bodies in contact.

Front

Explain the concept of constant velocity in terms of forces.

Back

Constant velocity means that the net force acting on an object is zero, resulting in no acceleration.

Front

What is the significance of the angle in force applications?

Back

The angle (θ) affects the effective component of the force acting in the direction of motion, influencing the work done.

Front

How do you determine the speed of an object using potential energy graphs?

Back

Use the conservation of energy principle: initial kinetic energy + initial potential energy = final kinetic energy + final potential energy.