What are the resistive forces?
In physics, resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body, and may refer to: Friction, during sliding and/or rolling. Magnetic repulsion, when a magnetic object moves against another magnetic field. Gravity, during vertical takeoff.
What is one example of a resistance force?
For example, a boat moving through still water experiences the resistive force of water resistance. If the water is moving in the same direction as the boat is moving but at a slower speed, the force of the water resistance is reduced.
Is resultant force the same as resistive force?
For example, when a car travels at a constant speed, the driving force from the engine is balanced by resistive forces such as air resistance and friction in the car’s moving parts. The resultant force on the car is zero. an object falling at terminal velocity experiences the same air resistance as its weight.
How do you find resistive forces?
m d v d t = m g + ( − F R ) or m d v d t = m g − F R , where represents this resistive force. Note that down is assumed to be the positive direction. The resistive force is typically proportional to the body’s velocity, v, or the square of its velocity, .
How do resistive forces work?
The effect of this work is to increase the kinetic energy of the object. At the same time the resistive force is also doing work on the object, in the opposite direction to the motion of the object. This work is the resistive force times the distance moved in the direction of this force.
How do you find the resistive force?
What are forces GCSE?
A force is any influence that causes an object to undergo a specific change. Related concepts include: thrust – increases the velocity of an object. air resistance – decreases the velocity of an object.
What is the average resistive force?
The average resistance force is the change in momentum divided by the time required to stop the bullet. The distance covered under constant acceleration is 1/2 a* t^2. The average acceleration is the change in velocity divided by the time.
Is weight a resistive force?
Some common forces are: Weight Weight is a force caused (on Earth) by the gravitational attraction of a mass to the Earth’s centre. Resistive Forces These include: Friction which is a force that prevents, or tries to prevent, the slipping or sliding of two surfaces in contact.
When is the driving force greater than the resistive force?
When the driving force is larger than the resistive force, the cyclist speeds up; when they are equal he travels at a steady speed, and when the driving force is less than the resistive force he slows down. When two objects interact, there is always an interaction pair of forces. In Fig.
How are the resultant force and balanced forces represented?
The resultant force and balanced forces. Forces have size and direction. On diagrams they are represented by arrows, in the direction the force acts. The length of the arrow represents the size of the force. When an object has several forces acting on it, the effect is the same as one force in a certain direction.
How are the size and direction of a force represented?
Forces have size and direction. On diagrams they are represented by arrows, in the direction the force acts. The length of the arrow represents the size of the force. When an object has several forces acting on it, the effect is the same as one force in a certain direction. This is called the resultant force.
When does an object have several forces acting on it?
When an object has several forces acting on it, the effect is the same as one force in a certain direction. This is called the resultant force. Fig. 9.5 shows how forces can be combined to give a resultant force.