Answer:
A) Increases by a factor of 2
Explanation:
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Given that mass, m = 2m
Substituting into the equation, we have;
K.E = ½mv²
K.E = ½*2mv²
Cross-multiplying, we have;
2K.E = 2mv²
Hence, if the mass of an object increases by a factor 2, kinetic energy is increased by a factor of 2.
Answer:
Explanation:
The equivalent of Newton's second law for rotational motions is:
where
is the net torque applied to the object
I is the moment of inertia
is the angular acceleration
In this problem we have:
(net torque, with a negative sign since it is a friction torque, so it acts in the opposite direction as the motion)
is the moment of inertia
Solving for , we find the angular acceleration:
Answer: a.) Roughness of the surfaces in contact with each other .
Higher the roughness of surfaces in contact with each other, greater is the friction between bodies. Force of friction will be less between smooth surfaces.
b.) Weight of the sliding/rolling body: greater the weight of the moving body on the surface, more is the force of friction on the body by the surface.
I hope this helps
Answer:
A bowling ball stored on a high shelf has more potential energy
A base ball on the same shelf should rather fall on my head
Explanation:
Potential energy =mgh where m= mass, g= gravitational force and h is height
The bowling ball is bigger and heavier than the base ball
which means more mass . The remaining parameters are constant.
This means the bowling ball has more potential energy.
Since the base ball is lighter then it’s preferable to land on someone’s head due to the lesser force it will expert and lesser pain too.
Newton's law states that objects at rest/motion will remain at rest/motion "UNLESS" a force is acted upon it.
So the soccer ball got kicked, and then came to rest. This doesn't state that the soccer ball was still rolling when the force of someone's foot kicked the ball.
