# Force and Motion Predicting Motion

Newton’s Law of Motion helps people predict how an object with rise or fall. To predict motion, you can use a ball or a piece of paper. If you drop a ball from 1,000 ft. will it bounce higher than how far it fell, or will it only bounce half way (500ft)? Newton’s first Law of Motion states that an object at rest will stay at rest, thus, for example, if the human body was to stay still instead of walking; it will be still until it is moved.

Newton’s second Law of Motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Which basically means that an object in motion stays in motion unless an unknown force makes the motion of the object stop or change. For example, if a car is driving down the road, it will stay in motion until you use your breaks to make it stop.

Newton’s third Law of Motion states that, for every action, there is an equal and opposite reaction. For another example, if you push open a door, the door will go forward, but afterwards; the door will go backwards to its original place. Newton’s Laws of Motion is seen around us everyday, whether it be in balloons or skateboards, the human body walking or being at rest, a ball bouncing off the ground and going into the air.

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Collision Newton’s third Law applies to Collision. Collisions happen when an object is moving at a fast speed and hits another object. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. For examples, collisions happen when a driver is not paying attention to what they are doing when they are driving and they run into or hit another vehicle. Collisions happen all the time all around the world. Most collisions happen during drunk driving or driving while using a cellphone.

Collisions are very different. Some examples are when a golf club hits a golf ball, a baseball bat hitting a baseball, your foot hitting a soccer ball, etc. Collisions happen when the forces of the two objects are equal in magnitude. The magnitude may be equal to the force, the acceleration may not be equal to the magnitude of an an object. When you hit/kick a ball, no one is paying attention to the force of the object, but the acceleration of the object. The law of action-reaction explains the nature of the forces between the two interacting objects. There are different types of collisions also, such as inelastic collision. An inelastic collision also involves energy. The energy involved in an inelastic collision is kinetic energy. An inelastic collision is when part of the kinetic energy is changed into some other form of energy. During an inelastic collision, the kinetic energy transforms into heat, sound or light energy. Inelastic collisions are usually microscopic.

A high speed car collision is an inelastic collision. Determine if a collision is elastic or inelastic, calculate the kinetic energy of the bodies before and after the collision. If kinetic energy is not conserved, then the collision is inelastic. Momentum is conserved in all inelastic collisions. Simple Machines A simple machine is a mechanical device that changes the direction or magnitude of a force. There are six basic forms of simple machines. One basic form is a lever. Levers are used to move or lift objects. You can find levers on boats or forklifts. The second and third basic form of a simple machine is the wheel and axle. A wheel and axle is used on a skateboard or a water well. The skateboard uses the force of motion while using the wheel and axle. Form number four is the inclined plane. An inclined plane is often used in real life applications to make moving heavy or delicate objects easier. Examples of inclined planes are ramps, sloping roads and hills, plows, chisels, hatchets, carpenter’s planes, and wedges. The fifth form of a simple machine is the wedge.

The wedge can be used for a door stop or a type of ramp. Wedges come in many shapes. A wedge can also be used on an axe. The axe is used to break things apart such as wood. The last form out of the six simple machines is the pulley. The pulley is used to lift or carry things. Examples of some pulleys are an elevator, wells, exercise machines, and theater systems. Elevators help transport people up and down to different levels of buildings. Wells are used to hold water and the machine/lever/pulley helps carry the water from the bottom of the well to the top of the well. Exercise machines such as weightlifting machines helps hold and lift weights. The pulleys that are used in theater systems help the curtains open and close or lower and raise on the stage.