Forces
1. Define scalar quantity.
2. Define vector quantity.
3. Give an example of a contact force.
4. Given an example of a non-contact force.
5. What is the difference between mass and weight?
6. What is the equation linking weight, mass and gravity?
7. What are the units for weight?
8. What are the units for mass?
9. What are the units for gravity?
10. How are forces represented?
11. What is the unit for force?
12. What is a resultant force?
13. What will happen if the resultant force acting on a stationary object is zero?
14. What will happen if the resultant force acting on a stationary object is not zero?
15. What will happen if the resultant force acting on a moving object is zero?
16. What will happen if the resultant force acting on a moving object is not zero?
17. What happens to the forces when a vehicle travels at a steady speed?
18. Which force are most of the resistive forces acting on a vehicle caused by?
Answers
Answer:
Hii
Explanation:
1. a scalar or scalar quantity is a quantity that can be described by a single element of a number field, such as a real number.
2. Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude.
3. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.
4. Falling of raindrops on earth is an example of non-contact force.
5. Mass is a measure of how much force it will take to change that path. Weight, on the other hand, is a measure of the amount of downwards force that gravity exerts on an object.
6. The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
7. Mainly Kilogram( Kg )
11. The SI unit of force is the newton, symbol N.
12. In physics and engineering, a resultant force is the single force and associated torque obtained by combining a system of forces and torques acting on a rigid body.
14. If the resultant force acting on an object (stationary or moving) is not zero, the object will accelerate or decelerate in the direction of the resultant force. same. direction as the object's direction of motion.
18. 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.
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Questions:
1. Define scalar quantity.
2. Define vector quantity.
3. Give an example of a contact force.
4. Given an example of a non-contact force.
5. What is the difference between mass and weight?
6. What is the equation linking weight, mass and gravity?
7. What are the units for weight?
8. What are the units for mass?
9. What are the units for gravity?
10. How are forces represented?
11. What is the unit for force?
12. What is a resultant force?
Answers:
1.) Scalar quantity is defined as the physical quantity with magnitude and no direction. Some physical quantities can be described just by their numerical value (with their respective units) without directions (they don’t have any direction). The addition of these physical quantities follows the simple rules of the algebra.
2.) A vector quantity is defined as the physical quantity that has both direction as well as magnitude. A vector with the value of magnitude equal to one and direction is called unit vector represented by a lowercase alphabet with a “hat” circumflex. That is “û“.
3.) Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work. In the first case the force is continuously applied by the person on the car, while in the second case the force is delivered in a short impulse.
4.) An apple falling down from a tree is one of the best examples of non-contact force. Iron pins attracted in the presence of a magnet bar without any physical contact. Falling of raindrops on earth is also an example of non-contact force. The charging of the hair and attraction of paper bits towards it.
5.) Mass is a measure of how much force it will take to change that path. ... Weight, on the other hand, is a measure of the amount of downwards force that gravity exerts on an object. This force increases with the object's mass: the more inertia it has, the harder gravity pulls.
6.) The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton
7.) The specific weight, also known as the unit weight, is the weight per unit volume of a material. A commonly used value is the specific weight of water on Earth at 4°C, which is 9.807 kN/m3 or 62.43 lbf/ft3. The terms specific gravity, and less often specific weight, are also used for relative density.
8.) The SI unit of mass is the kilogram (kg).
9.) In SI units, G has the value 6.67 × 10-11 Newtons kg-2 m2.
10.) Force can also be described intuitively as a push or a pull. ... It is measured in the SI unit of newtons and represented by the symbol F. The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.
11.) The SI unit of force is the newton, symbol N.
12.) The resultant force is described as the total amount of force acting on the object or body along with the direction of the body. The resultant force is zero when the object is at rest or it is traveling with the same velocity as the object. The resultant force should be equal for all the force since all the force is acting in the same direction.
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