Which has a greater momentum a car moving at 40 mph or the same car moving at 80 mph?

Which has a greater momentum a car moving at 40 mph or the same car moving at 80 mph?

The momentum of a moving object is equal to its mass multiplied by its velocity. An object has a large momentum if either its mass or its velocity is large. Thus, a fast-moving car has more momentum than a slow-moving car, if they have the same mass.

When the net external force acting on a system is zero then the total momentum of the system is zero?

If the net external force acting on a system is zero, then the momentum of the system is constant. An important application is to collisions. In the simplest case we consider the collision of two particles in one-dimension, of which there are two extreme regimes. Only momentum of the two-body system is conserved.

What is the reason padded dashboards are used in cars?

Padded dashboards are safety features that give riders a way to protect themselves in case an airbag does not deploy. Hitting the padding instead of the dashboard reduces the forces acting on the body during impact. This feature has a huge effect on the severity of head injuries from car collisions.

Which of the following statements is true about kinetic energy in an elastic collision if the momentum is conserved?

Answer and Explanation: The correct statements are: A Both momentum and kinetic energy are conserved, because in a ellastic collision the kinetic energy is conserved and all the forces involved in the collision are internal to the system so the momentum is also conserved.

Does greater momentum mean greater speed?

In symbols, linear momentum is expressed as p = mv. Momentum is directly proportional to the object’s mass and also its velocity. Thus the greater an object’s mass or the greater its velocity, the greater its momentum. Momentum p is a vector having the same direction as the velocity v.

What is the momentum of a 3kg bowling ball moving at 3 m s?

Expert-Verified Answer The momentum of an object is calculated by multiplying its mass (m) by its velocity (v). In this case, you have a 3 kg bowling ball moving at 3 m/s, and you want to find its momentum (p). So, the momentum of the 3 kg bowling ball moving at 3 m/s is 9 kg·m/s.

When the net force acting on a system is zero then the system is called?

A. its momentum is conserved.

Why momentum is conserved when external force is zero?

It directly comes from Newton’s second law of motion. According to which, rate of change of momentum is proportional to the applied external force. Therefore, the absence of the external force causes the rate to be zero. Hence the momentum remains constant or conserved.

What happens to momentum when there is no net external force on the system?

Internal forces do not change the momentum of the system. In absence of net external force, the momentum will remain conserved.

What is the SI unit of momentum?

Momentum
SI unit	kilogram meter per second (kg⋅m/s)
Common symbols	p, p
Other units	slug⋅ft/s
Dimension	MLT−1

What is the SI unit of impulse?

The SI unit of impulse is Newton-seconds (Ns) or kg m/s.

Can impulse be negative?

People forget what the sign of impulse means. Impulse is a vector, so a negative impulse means the net force is in the negative direction. Likewise, a positive impulse means the net force is in the positive direction.

Which has more momentum when moving at the same speed?

Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum. A less massive object can never have more momentum than a more massive object. Two identical objects are moving in opposite directions at the same speed.

Which has more momentum a car travelling at 50 mph or a truck travelling at the same velocity?

A moving object can have a large momentum if it has a large mass, a high speed, or both. It is harder to stop a large truck than a small car when both are moving at the same speed. The truck has more momentum than the car.

Which has the greatest momentum when moving?

The forward moving object will have the greatest momentum. An object with a changing speed will have a changing momentum.

Which has a greater momentum a car or a bike moving at the same speed?

Answer and Explanation: Now, the car has more mass, therefore it will have more momentum since the velocity is constant for both.