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2 years ago

What causes an object to slow down or speed up?

Physics

2 answers:

Elodia [21]2 years ago

8 0

Answer:

An object can slow down or speed up depending on the external force that is applied. But it must be unbalanced and not equal in order to move the object, doesn't concern if it has to decrease or increase in speed.

In order to slow down an object, friction often works here. Friction is a force that occurs when two surfaces slide past one another. The force of friction opposes the motion of an object, causing moving objects to lose energy and slow down. When objects move through a fluid, such as air or water, the fluid exerts a frictional force on the moving object. For example: tires skidding to a stop on a road, sandpaper rubbing against wood, air pushing against the nose of an airplane.

When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls. This works to speed up when something falls. When moving in horizontal direction, forces make things speed up/accelerate. When a force pushes or pulls the object, the object will move in the direction of the force. The bigger the force, and the lighter the object, the greater the acceleration.

And sorry for making it too long! But I hope I could make it clear for you! ^^

Arisa [49]2 years ago

6 0

Answer:

Unbalanced forces

Explanation:

Unbalanced forces acting on an object can change the object's speed, causing it to speed up or slow down.

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3 years ago

If the mass of each ball is 12 kg and they experience a gravitational force of magnitude 2.00

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Answer:

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2 years ago

Two students are on a balcony 19.1 m above the street. One student throws a ball, b1, vertically downward at 13.9 m/s. At the sa

tester [92]

Answer:

Part a)

$t = 2.83 s$

Part b)

Ball thrown downwards = $v_f = 23.8 m/s$

Ball thrown upwards = $v_f = 23.8 m/s$

Part c)

$d = 22.24 m$

Explanation:

Part a)

Since both the balls are projected with same speed in opposite directions

So here the time difference is the time for which the ball projected upward will move up and come back at the same point of projection

Afterwards the motion will be same as the first ball which is projected downwards

so here the time difference is given as

$\Delta y = 0 = v_y t + \frac{1}{2}at^2$

$0 = 13.9 t - \frac{1}{2}(9.81) t^2$

$t = 2.83 s$

Part b)

Since the displacement in y direction for two balls is same as well as the the initial speed is also same so final speed is also same for both the balls

so it is given as

$v_f^2 - v_i^2 = 2 a \Delta y$