- Why does an object at rest have no momentum?
- What keep the object remain at rest?
- Who said that a force is not needed to keep an object moving?
- What happens to the empty can?
- What is the empty can exercise?
- What does a positive empty can test indicate?
- Why do you think the image demonstrates balanced forces unbalanced forces?

Which has more momentum, a heavy truck moving at 30 km/h or a light truck moving at 30 km/h? Answer: If two objects are running at the same velocity, the object with greater mass has more momentum compared to the object with a lesser mass since the formula of momentum is (momentum = mass × velocity) .

## Why does an object at rest have no momentum?

Objects at rest do not have momentum – they do not have any “mass in motion.” Both variables – mass and velocity – are important in comparing the momentum of two objects. The momentum equation can help us to think about how a change in one of the two variables might affect the momentum of an object.

## What keep the object remain at rest?

Inertia is the property of a body to remain at rest or to remain in motion with constant velocity. Some objects have more inertia than others because the inertia of an object is equivalent to its mass.

## Who said that a force is not needed to keep an object moving?

Newton

## What happens to the empty can?

For the empty can, 100% of the mass of the can spins as the can rolls, but for the full can, much of the liquid in the can is effectively sliding down the ramp without spinning. Thus 100% of the mass of the sliding liquid goes into translational kinetic energy, and the full can will have a greater speed.

## What is the empty can exercise?

The empty can/ full can exercise involves taking your arms out to the side (abduction) on about a 45-degree angle and turning your thumbs down (pronation) or as if you are pouring a can out and then turning the can upwards (supination) this exercise is done with weights being held and repeating the pronation and …

## What does a positive empty can test indicate?

The test is considered positive if weakness, pain or both are present during resistance. A positive test result suggests a tear to the supraspinatus tendon or muscle, or neuropathy of the suprascapular nerve.

## Why do you think the image demonstrates balanced forces unbalanced forces?

Since these two forces are of equal magnitude and in opposite directions, they balance each other. The person is at equilibrium. There is no unbalanced force acting upon the person and thus the person maintains its state of motion.