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2 years ago

Describe a situation in which friction changes the direction of a moving object.

Physics

2 answers:

Zarrin [17]2 years ago

8 0

Answer:

A car making a turn

Explanation:

lora16 [44]2 years ago

3 0

Consider a person trying to push a large crate across a floor, as in the diagram. As they apply a force to push the crate along the floor in one direction, a frictional force is generated in the opposite direction.

$study \: well.....$

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How high was a brick dropped from if if falls in 2.5 seconds?

jenyasd209 [6]

Using the kinematic equation d = V_0 * t + 1/2 * a * t^2, where d is height you can rewrite this to be d = 1/2*g*t^2 or 4.9t^2
g = a because this is a free fall
d = 1/2 * 9.81m/s^2 * 2.5^2
d = 30.65625m
d = 30.7m

7 0

3 years ago

A ball, which has a mass of 1.25 kg, is thrown straight up from the top of a building 225 meters tall with a velocity of 52.0 m/

Anastasy [175]

First we will find the speed of the ball just before it will hit the floor

so in order to find the speed of the cart we will first use energy conservation

$KE_i + PE_i = KE_f + PE_f$

$\frac{1}{2}mv_i^2 + mgh = \frac{1}{2}mv_f^2 + 0$

$\frac{1}{2}(1.25)(52)^2 + 1.25(9.8)(225) = \frac{1}{2}(1.25)v_f^2$

So by solving above equation we will have

$v_f = 84.3 m/s$

now in order to find the momentum we can use

$P = mv$

$P = 1.25 \times 84.3$

$P = 105.4 kg m/s$

3 0

4 years ago

The product of 2 x 104 cm and 4 x 10–12 cm, expressed in scientific notation is ____.

sdas [7]

Answer: 8 * 10⁻⁸ cm² .
______________________________________________________
Explanation:
______________________________________________

(2 * 10⁴ cm) * (4 * 10⁻¹² cm) =

2 *4 * 10⁴ * 10⁻¹² = 8 * 10⁽⁴⁺⁽⁻¹²⁾⁾ = 8 * 10⁻⁸ cm² .
_________________________________________

Note the follow property of exponents:
_____________________________________________________

xᵃ * xᵇ = x⁽ᵃ ⁺ ᵇ⁾ ; as such: " 10⁴ * 10⁻¹² = 10⁽⁴⁺⁽⁻¹²⁾⁾ = 10⁻⁸ " .
_____________________________________________________

6 0

3 years ago

Samara stands on the ground. Gravity is applying a force to pull

sineoko [7]

Answer:

action reaction

Explanation:

newtons third law

3 0

3 years ago

an athlete runs 5.4 laps around a circular track that is 400.0 m long. If this takes 540 s, what is the average velocity of the

Slav-nsk [51]

Answer:

Average velocity is 0.296 m/s.

Average speed is 4.0 m/s.

Explanation:

Given:

Distance of the circular track is, $D=400.0\ m$

Number of laps ran is, $n=5.4$

Time taken for the run is, $t=540\ s$

Now, total distance covered in 5.4 laps = $D_T=D\times n=400\times 5.4=2160\ m$

Also, since the path is a circle, the final position of the athlete after 5.4 laps will be 0.4 of 400 m ahead of the starting point.

Distance covered in 0.4 laps is, $\textrm{Displacemet}=0.4\times 400=160\ m$

Therefore, the displacement of the athlete will be 160 m as the athlete is 160 m ahead of the starting point and displacement depends on the initial and final points only.

Now, average velocity is given as:

$v_{avg}=\frac{\textrm{Displacemet}}{t}=\frac{160}{540}=0.296\ m/s$

Average speed is the ratio of total distance covered to total time taken.

So, average speed = $\frac{D_T}{t}=\frac{2160}{540}=4\ m/s$

6 0

4 years ago

Describe a situation in which friction changes the direction of a moving object.​

Describe a situation in which friction changes the direction of a moving object.