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charle [14.2K]
3 years ago
15

A force applied to an object at rest causes the object to move. According to Newton’s first law, what must be true of the force?

Physics
1 answer:
Daniel [21]3 years ago
4 0

Answer:

An object will not move unless acted upon by an unbalanced force.

Explanation:

Since Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Hope this helps!!

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NNADVOKAT [17]

The speed of the tennis ball is 8 km/h when Alana throws the ball behind at the speed of 11 km/h.

<h3>What is the frame of reference?</h3>

It is a point from where the motion is observed. The speed changes with the frame of reference.

For the person standstill on the sidewalk, If  Alana throw the ball in the front direction, The speed will be,

19+11 = 30 km/h

It Alana just leave the ball, the speed,

19 +0 = 19 km/h

If Alana throws the ball behind her at the speed of 19 km/h. The speed of the ball for a sidewalk observer,

19 +(-19 ) =  0 km/h

Thus, when Aana throw the ball behind the velocity will be negative,

So,

19 + (-11 ) = 8 km/h

Therefore, the speed of the tennis ball is 8 km/h when Alana throws the ball behind at the speed of 11 km/h.

Learn more about Frame of reference:

brainly.com/question/9820962

8 0
2 years ago
What are the components of a vector with a magnitude of 4.00 and a direction of -112°?
zzz [600]

Answer: (-1.50 -3.71)

Explanation:

4 0
3 years ago
Which is a physical property that can be used to tell one substance from another?
siniylev [52]

Should be B. Density.

3 0
3 years ago
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An object with a mass of 2 kg has a force of 4 N acting on it. What is the acceleration of the object?
STatiana [176]
Answer: 2 m/s^2

Explain

£F=ma
net force = mass x acceleration
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8 0
3 years ago
A car traveling in a constant speed of 55km/h on a circular track what is the acceleration explain​
a_sh-v [17]

Answer:

See the explanation below

Explanation:

We must solve this problem by defining that when we have a constant velocity, the acceleration is equal to zero. That is, when there is no speed change, there is no acceleration. We can understand it very easily by means of the following equation of kinematics.

v_{f}=v_{o}+a*t

where:

Vf = final velocity = 55 [km/h]

Vo = initial velocity = 55 [km/h]

a = acceleration [m/s²]

t = time [s]

As we can see there is no change in speed, and the difference between the two is equal to zero.

0 = 0 +a*t\\a = (0-0)/t\\a= 0

3 0
3 years ago
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