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ss7ja [257]
4 years ago
5

What are the three types of friction and when does each apply?

Physics
1 answer:
Anestetic [448]4 years ago
4 0

The force that opposes the motion of an object is called friction.

There are two kind of friction namely kinetic and static friction forces.

Kinetic friction is the force that is exerted on one surface by another when the two surfaces rub against each other because one or both surfaces are moving.

Static friction is the opposing force that acts against a secondary force that is trying to cause a stationery object to start moving.   If there is no such force acting on the subject, the static friction is nil or zero.


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A hiker walks 11 km due north from camp and then turns and walks 11 km due east. What is the total distance walked by the hiker?
AnnyKZ [126]

Answer:

22 km

Explanation:

11km + 11km= 22km

3 0
3 years ago
Read 2 more answers
Conservation of energy is explained as a scientific law and not a _______ because it does not explain why energy is conserved
AURORKA [14]

Answer:

Theory

Explanation:

Conservation of energy is explained as a scientific law and not a theory because it does not explain why energy is conserved.

A law is a the statement of a scientific fact. It is a product of repeated experiment and observation through time. Most laws do not explain the reason for the logic behind their premise.

A theory on the other hand provides an explanation for an observed phenomenon. Most theories are no immutable. They are often changed when new finds are reported or made.

Laws are immutable and they stand still.

6 0
3 years ago
An electric heater is rated at 1400 W, a toaster is rated at 1150 W, and an electric grill is rated at 1560 W. The three applian
gayaneshka [121]

Answer:

The current in the heater is 12.5 A

Explanation:

It is given that,

Power of electric heater, P₁ = 1400 W

Power of toaster, P₂ = 1150 W

Power of electric grill, P₃ = 1560 W

All three appliances are connected in parallel across a 112 V emf source. We need to find the current in the heater. We know that in parallel combination of resistors the current flowing in every branch of resistor divides while the voltage is same.

Electric power, P_1=V\times I_1

I_1=\dfrac{P_1}{V}

I_1=\dfrac{1400\ W}{112\ V}

I_1=12.5\ A

So, the current in the heater is 12.5 A. Hence, this is the required solution.  

8 0
4 years ago
A tennis ball is dropped from 1.16 m above the
sweet-ann [11.9K]

Answer:

Vf = 4.77 m/s

Explanation:

During the downward motion we can easily find the final velocity or the velocity with which the ball hits the ground, by using third equation of motion. The third equation of motion is given as follows:

2gh = Vf² - Vi²

where,

g = acceleration due to gravity = 9.8 m/s²

h = height = 1.16 m

Vf = Final Velocity of Ball = ?

Vi = Initial Velocity of Ball = 0 m/s (Since, ball was initially at rest)

Therefore, using these values in the equation, we get:

(2)(9.8 m/s²)(1.16 m) = Vf² - (0 m/s)²

Vf = √(22.736 m²/s²)

<u>Vf = 4.77 m/s</u>

6 0
3 years ago
How does the “Newton’s Cradle” toy demonstrate Newton’s Third Law of Motion?
morpeh [17]
 because it deals with reaction
7 0
3 years ago
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