Answer:
159 N
Explanation:
The force of friction is a resistive force that acts against an object in motion (or on the verge of moving).
There are two types of force of friction:
- Force of static friction: it occurs when the object is still at rest
- Force of kinetic friction: it occurs when the object is sliding on a surface and it is in motion
In this problem, we are in the 2nd situation, so we want to calculate the force of kinetic friction.
This force is given by:
where
is the coefficient of kinetic friction
N is the normal force exerted on the object
For the sled and the girl in this problem,
is the coefficient of kinetic friction
N = 636 N is the normal force
So the force of friction is
Answer:
5 Pascals
Explanation:
Pressure is equal to force/area and the area is 60cm to m is 0.6m. Then the area is 0.6m×5m=3m^2. which gives a pressure of 15N/3m^2=5Pa
Contact area is not a factor of the amount of friction force acting between two bodies in contact, preventing rolling or sliding
Reasons:
- Friction force is the product of the normal reaction and the coefficient of friction.
- The coefficient of friction is higher in softer tires than hard tires which are required to be wider to reduce the pressure that can cause deformation withstood by hard tires.
- The wide tires in drag racing cars can be thought of being made from the soft compound tire material having a higher coefficient of friction that increases the friction force.
Other advantages of wide tires are;
- Shorter stopping distance
Learn more here:
brainly.com/question/17209968
Answer:
increase the resistance of the bulb
Explanation:
In a simple circuit the power dissipated in a light bulb is proportional to the product of the voltage and the current
P = i V
Besides the voltage is
V = i R
P = i² R
Therefore, a simple method to decrease the power dissipated in a bulb to increase the resistance of the bulb, for this a series resistance is placed in the circuit.
Consequently the correct answer is increase the resistance of the bulb
kinematics can be defined as a sub-discipline in physics aimed at understanding the motion of objects without considering the forces that move them.
- Classical mechanics refers to a physical theory that describes the motion of objects.
- Kinematics can be considered a branch of classical mechanics that studies the motion of objects but without considering the forces that move them.
- Kinematics describes the motion of objects and systems by using different types of information such as diagrams, numbers, equations and/or graphs.
In conclusion, kinematics is a sub-discipline in physics aimed at understanding the motion of objects without considering the forces that move them.
Learn more about kinematics here:
brainly.com/question/24486060
