# Force based on mass and velocity relationship

### Force, Mass, Acceleration | Zona Land Education

Substitute the measurements for force, distance and mass into the equation. If the force is 2 Newtons, the distance is 5 m and the mass is kg. Definitions of force, mass, velocity, acceleration, weight; Vector It depends on the mass of the object and varies slightly depending However, the external force, in this case, is gravity which causes the ball to follow a curve. Explains Newton's Second Law of Motion in terms of the equation F=ma. Now, what about the inverse proportion between acceleration and mass, is that.

Sciencing Video Vault Impact From a Falling Object Suppose you want to know the impact force of a rock with a mass of one kilogram that falls from a height of two meters and embeds itself two centimeters deep inside of a plastic toy. The first step is to set the equations for gravitational potential energy and work equal to each other and solve for force.

The second and final step is to plug the values from the problem into the equation for force. Remember to use meters, not centimeters, for all distances. The stop distance of two centimeters must be expressed as two hundredths of a meter. Also, the acceleration due to gravity on Earth is always 9.

## Force, Mass, Acceleration and How to Understand Newton's Laws of Motion

The force of impact from the rock will be: Impact From a Horizontally Moving Object Now suppose you want to know the impact force of a 2,kilogram car traveling at 20 meters per second that crashes into a wall during a safety test.

The stop distance in this example is the crumple zone of the car, or the distance by which the car shortens on impact. Suppose the car is squished enough to be three quarters of a meter shorter than it was before the impact. Again, the first step is to set the equations for energy -- this time kinetic energy -- and work equal to each other and solve for force. The final step is to plug the values from the problem into the equation for force: References Georgia State University: Weight This is the force exerted by gravity on an object.

It depends on the mass of the object and varies slightly depending on where it is located on the planet and the distance from the center of the Earth. An object's weight is less on the Moon and this is why the Apollo astronauts seemed to bounce around a lot and could jump higher. However it could be greater on other planets. Weight is due to the gravitational force of attraction between two bodies.

It is proportional to the mass of the bodies and inversely proportional to the square of the distance apart. In engineering, this force acting on a structure is known as a load.

Tensile or Compressive Reaction When you stretch a spring or pull on a rope, the material exerts an equal reactive force pulling back in the opposite direction.

This is known as tension. If you try to compress an object such as a spring, sponge, gas or simply place an object on a table, the object pushes back.

Working out the magnitude of these forces is important in engineering so that structures can be built with members which will withstand the forces involved, i. Static Friction Friction is a reactive force which opposes motion.

Friction can have beneficial or detrimental consequences. When you try to push a piece of furniture along the floor, the force of friction pushes back and makes it difficult to slide the furniture. This is an example of a type of friction known as dry friction, static friction or stiction. Friction can be beneficial.

## The Mighty F = ma

Without it everything would slide and we wouldn't be able to walk along a pavement without slipping. Tools or utensils with handles would slide out of our hands, nails would pull out of timber and brakes on vehicles would slip and not be of much use.

Viscous Friction or Drag When a parachutist moves through the air or a vehicle moves on land, friction due to air resistance, slows them down. If you try to move your hand through water, the water exerts a resistance and the quicker you move your hand, the greater the resistance.

These reactive forces are known as viscous friction or drag. Electrostatic and Magnetic Forces Electrically charged objects can attract or repel each other.

Similarly like poles of a magnet will repel each other while opposite poles will attract. First Law "An object will continue in its state of rest or motion in a straight line provided no external force acts on it" Basically, this means that if for instance a ball is lying on the ground, it will stay there. If you kick it into the air, it will keep moving.

### How is force related to momentum?

If there was no gravity, it would go on for ever. However, the external force, in this case, is gravity which causes the ball to follow a curve, reach a max altitude and fall back to the ground.

Another example is if you put your foot down on the gas and your car accelerates and reaches top speed. When you take your foot off the gas, the car slows down, The reason for this is that friction at the wheels and friction from the air surrounding the vehicle known as drag causes it to slow down.

If these forces were magically removed, the car would stay moving forever. Second Law "The acceleration of a body is directional proportional to the force which caused it and inversely proportional to the mass and takes place in the direction which the force acts" This means that if you have an object and you push it, the acceleration is greater for a greater force.

So a horse power engine in a sports car is going to create loads of thrust and accelerate the car to top speed rapidly. Imagine if that engine was placed into a heavy train locomotive and could drive the wheels.

**Newton's First Law of Motion - Second & Third - Physics Practice Problems & Examples**

Because the mass is now so large, the force creates much lower acceleration and the locomotive takes much longer to reach top speed. A force of 10 newtons is applied to a mass of 2 kilos. What is the acceleration?

- How is force related to momentum?
- Calculating Force from Velocity and Mass + some common misconceptions

What is the weight of a 10 kg mass? When you push on a spring, the spring exerts a force back on your hand. If you push against a wall, the wall pushes back. When you stand on the ground, the ground supports you and pushes back up.

If you try to stand on water, the water cannot exert enough force and you sink. Foundations of buildings must be able to support the weight of the construction. Columns, arches, trusses and suspension cables of bridges must exert enough reactive compressive or tensile force to support the weight of the bridge and what it carries.

When you try to slide a heavy piece of furniture along the floor, friction opposes your effort and makes it difficult to slide the object Test Yourself!