Physics ยท Science General

Collisions, Momentum and Kinetic Energy

385 Questions

Collisions, momentum, and kinetic energy questions analyze the principles of elastic and inelastic impacts. They require calculating mass, velocity, and conserved energy during physical interactions. These foundational physics topics are essential for most government engineering and general science examinations.

Elastic collisionsInelastic collisionsMomentum calculationKinetic energy principlesVelocity after impact

Collisions, Momentum and Kinetic Energy Questions

Multiple choice

A 20 kg object is moving at a velocity of 10 m/s. What is its kinetic energy?

  1. 200 J

  2. 400 J

  3. 800 J

  4. 1600 J
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(20 kg)(10 m/s)^2 = 800 J$.

Multiple choice

A 30 kg object is moving at a velocity of 15 m/s. What is its kinetic energy?

  1. 675 J

  2. 1350 J

  3. 2700 J

  4. 5400 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(30 kg)(15 m/s)^2 = 1350 J$.

Multiple choice

A 40 kg object is moving at a velocity of 20 m/s. What is its kinetic energy?

  1. 1600 J

  2. 3200 J

  3. 6400 J

  4. 12800 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(40 kg)(20 m/s)^2 = 3200 J$.

Multiple choice

A 50 kg object is moving at a velocity of 25 m/s. What is its kinetic energy?

  1. 3125 J

  2. 6250 J

  3. 12500 J

  4. 25000 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(50 kg)(25 m/s)^2 = 6250 J$.

Multiple choice

A 100 kg object is moving at a velocity of 30 m/s. What is its kinetic energy?

  1. 15000 J

  2. 30000 J

  3. 60000 J

  4. 120000 J
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(100 kg)(30 m/s)^2 = 45000 J$.

Multiple choice

A 200 kg object is moving at a velocity of 40 m/s. What is its kinetic energy?

  1. 32000 J

  2. 64000 J

  3. 128000 J

  4. 256000 J
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(200 kg)(40 m/s)^2 = 128000 J$.

Multiple choice

A 300 kg object is moving at a velocity of 50 m/s. What is its kinetic energy?

  1. 225000 J

  2. 450000 J

  3. 900000 J

  4. 1800000 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(300 kg)(50 m/s)^2 = 450000 J$.

Multiple choice

A 400 kg object is moving at a velocity of 60 m/s. What is its kinetic energy?

  1. 720000 J

  2. 1440000 J

  3. 2880000 J

  4. 5760000 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(400 kg)(60 m/s)^2 = 1440000 J$.

Multiple choice

A 500 kg object is moving at a velocity of 70 m/s. What is its kinetic energy?

  1. 1225000 J

  2. 2450000 J

  3. 4900000 J

  4. 9800000 J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kinetic energy of the object is given by the formula $K = rac{1}{2}mv^2$. Substituting the values of $m$ and $v$, we get $K = rac{1}{2}(500 kg)(70 m/s)^2 = 2450000 J$.

Multiple choice

Which of the following is a common approach for resolving collisions between objects in a physics simulation?

  1. Impulse-based collision response

  2. Penalty-based collision response

  3. Position-based collision response

  4. Energy-based collision response
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Impulse-based collision response is a common approach that involves applying an impulse to objects at the moment of collision to conserve momentum.