physics

• The second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be mathematically expressed as F = ma, where F is the net force, m is the mass, and a is the acceleration.
• Energy can be transferred between objects by work done, heating or cooling, and electric current.
• The SI unit of energy is the joule (J).
• Work done = force x distance moved in direction of force
• Inertia is the tendency of an object at rest to remain at rest or an object in motion to continue moving with constant velocity unless acted upon by a resultant external force.
• Newton's first law of motion states that every body continues in its state of rest or uniform motion along a straight line until acted upon by a resultant external unbalanced force.
• Power is defined as the rate at which energy is used or supplied.
• Newton's first law of motion states that if there are no forces acting on an object, then the object will either stay still or move at a constant speed in a straight line.
• A balanced force system has no effect on the motion of an object because there are equal forces acting in opposite directions.
• An unbalanced force system causes an object to change speed, direction, or both.
• Acceleration is the rate of change of velocity.
• Forces are created from the interaction between bodies, such as a push or pull.
• During force interactions, it is common to represent situations as simply as possible without losing information.
• In physics, objects are represented as point particles.
• Forces are represented by arrows because forces are vectors.
• 0.20 V
• 0.90 V
• What fraction of the iceberg is above the water? A
• 0.10 V
• 0.97 V
• The density of seawater is 1020 kg m^3.
• The length of the arrow gives the magnitude of the force, and its direction gives the force's direction.
• The forces acting on an object when pushed to the right over a rough surface can be represented as point particle representation of the forces acting on a moving object.
• The forces acting on an object suspended from a stationary rope can be represented as free-body diagram.
• As situations become more complex, there are often forces on multiple objects in different directions.
• A free-body diagram can be used to identify which forces act in which plane and to resolve the net force in a particular direction.
• The diagram is for one object at a time, with the body represented by a point (the centre of mass) or a box or circle where all the forces act on.
• Gravitational force is the attractive force experienced by two objects with mass in a gravitational field, such as the force between a planet and a comet.
• Examples of non-contact forces include Gravitational force, Electrostatic force, and Magnetic force.
• In a scenario where Ben drags a sledge behind him as he climbs up a hill, the contact forces include Ben pulling on a rope attached to the sledge producing tension in the rope, the ground supporting Ben and the sledge with a reaction force, and friction between the sledge and the ground which opposes the motion.
• A non-contact force is defined as a force which acts at a distance, without any contact between bodies, due to the action of a field.
• Electrostatic force is a force experienced by charged objects in an electric field which can be attractive or repulsive, such as the attraction between a proton and an electron.
• The non-contact forces in this scenario include the gravitational attraction between the Earth and Ben pulling Ben and the sledge downwards.
• Magnetic force is a force experienced between magnetic poles in a magnetic field that can be attractive or repulsive, such as the attraction between the north and south poles of magnets.
• The equation for the conservation of momentum in the horizontal direction is: m1u1 = m1v1 cos θ1 + m2v2 cos θ2.
• Newton's First Law of motion states that an object will continue to travel in a straight line at a constant speed unless acted on by another force.
• The red arrows represent the velocity vectors of the puck.
• If the string were cut, the puck would move off in the direction shown by the red vector, as predicted by Newton’s first law.
• The speed of the rst ball before the collision, u1, can be calculated as: m1u1 = (m1v1 cos θ1 + m2v2 cos θ2).
• Newton's Second Law of motion states that for zero acceleration, there is no net or resultant force.