Midterm Review: Energy & Momentum

Front

What happens to the kinetic energy of an object if its speed is tripled?

Back

The kinetic energy is increased by a factor of nine.

Front

What is the relationship between mass, velocity, and momentum?

Back

An object with a very small mass can still have a large momentum if its velocity is very large.

Front

How do you calculate the kinetic energy of an object?

Back

Kinetic energy (KE) = 0.5 * mass (m) * velocity (v)^2.

Front

What is the kinetic energy of a 3.00 kg toy falling from a height of 1.00 m?

Back

98.0 J (assuming no air resistance and g = 9.81 m/s²).

Front

What is the principle of conservation of momentum?

Back

In a closed system, the total momentum before an event is equal to the total momentum after the event.

Front

How do you find the initial speed of a moving object after a collision?

Back

Use the conservation of momentum formula: m1*v1 + m2*v2 = (m1 + m2)*v_final.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of motion.

Front

What factors affect the kinetic energy of an object?

Back

Kinetic energy depends on the mass of the object and the square of its velocity.

Front

If an object is at rest, what is its momentum?

Back

The momentum of an object at rest is zero.

Front

What is the formula for momentum?

Back

Momentum (p) = mass (m) * velocity (v).