Physics Concepts for LET Review

What is the formula for calculating displacement in one-dimensional motion?

• Displacement = x_f * x_i

• Displacement = x_f / x_i

• Displacement = x_i + x_f

• Displacement = x_f - x_i

Define velocity and how it differs from speed.

• Velocity measures distance over time, while speed measures time over distance.

• Velocity is a vector quantity that includes direction, while speed is a scalar quantity that only measures magnitude.

• Speed is a vector quantity that includes direction, while velocity is a scalar quantity.

• Velocity is the same as speed but measured in kilometers per hour.

State Newton's First Law of Motion and provide an example.

• An example of Newton's First Law is a hockey puck sliding on ice; it will keep moving in a straight line at a constant speed until friction or another force stops it.

• A car accelerating on a highway is an example of Newton's First Law.

• A satellite orbiting Earth is an example of Newton's First Law.

• A ball thrown upwards will eventually fall back down due to gravity.

What is the relationship between force, mass, and acceleration according to Newton's Second Law?

• Acceleration is independent of mass and force (a = m + F).

• Force is equal to mass divided by acceleration (F = m / a).

• Force equals mass times acceleration (F = m * a).

• Mass is the product of force and acceleration (m = F * a).

Explain the concept of work done in physics.

• Work done is the product of force and distance in the direction of the force, measured in joules.

• Work done is the rate of change of momentum over time.

• Work done is the sum of all forces acting on an object.

• Work done is the total energy consumed in a system.

How is kinetic energy calculated?

• KE = 0.5 * v^2

• KE = 0.5 * m * v^2

• KE = m * v^2 / 2

• KE = m * v

What is the principle of conservation of energy?

• Energy can be created and destroyed.

• Energy is only lost in transformations.

• Energy can be generated from nothing.

• Energy cannot be created or destroyed, only transformed.

Define momentum and its formula.

• Momentum is defined as F = m * a.

• Momentum is the rate of change of energy.

• Momentum is calculated using the formula E = mc^2.

• Momentum is defined as p = m * v.

What happens to momentum in an elastic collision?

• Momentum is lost in an elastic collision.

• Momentum is only partially conserved in an elastic collision.

• Momentum is transformed into energy in an elastic collision.

• Momentum is conserved in an elastic collision.

Describe the difference between elastic and inelastic collisions.

• Elastic collisions occur only at high speeds, while inelastic collisions occur at low speeds.

• Elastic collisions conserve momentum and kinetic energy; inelastic collisions conserve momentum but not kinetic energy.

• Both elastic and inelastic collisions conserve kinetic energy but not momentum.

• Elastic collisions do not conserve momentum; inelastic collisions do.