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Before the 17th century what ideas did people have concerning motion velocity and acceleration?
There were many different ideas, but they all went something like this:
Most people thought that the natural state of an object was at rest, and that force needed to be applied in order to keep an object moving at constant velocity. Of course, we now know that no force is needed for constant velocity, only acceleration.
What else can I help you with?
Does a skydivers decreases her acceleration when falling 5 seconds before reaching her terminal velocity?
No, a skydiver's acceleration remains constant as they fall towards their terminal velocity. This is because terminal velocity is the point at which the forces of gravity and air resistance are balanced, resulting in a constant velocity.
Can a body have zero velocity and still acceleration give examples?
Yes, a body can have zero velocity and still have acceleration. For example, when a car is at a complete stop but then accelerates to start moving, it has zero velocity at the moment before acceleration kicks in. Another example is when an object reaches the peak of its motion and momentarily stops before accelerating back downwards due to gravity.
Can an object have velocity and acceleration vectors that point in opposite directions?
Yes it can, and it's really easy. -- A stone tossed upward, before it peaks and starts falling, has upward velocity and downward acceleration. -- A car driving east and slowing for a stop-sign has eastward velocity and westward acceleration.
What is the acceleration if the velocity is 0?
It's not possible to tell from only that much information. When you throw a rock up, its acceleration is the acceleration of gravity from the moment it leaves your hand until it hits the ground. But its velocity is upward some time, downward some time, and zero at the top.
How do you find the distance if only the final velocity and the acceleration is given?
You can find the distance using the equation: distance = (final velocity)^2 / (2 * acceleration). Square the final velocity, divide it by twice the acceleration to get the distance traveled before coming to a stop.
When velocity is zero and acceleration is negative what happens to an object's motion?
When velocity is zero and acceleration is negative, the object may be coming to a stop and starting to move in the opposite direction. The negative acceleration is causing the object to slow down, while the zero velocity indicates that it has momentarily come to a halt before changing direction.
What acceleration does a parachutist have when falling before opening the parachute?
A parachutist falling before opening the parachute experiences an acceleration due to gravity of approximately 9.81 m/s^2, which is the acceleration due to free fall. This acceleration causes the parachutist's velocity to increase as they fall towards the ground.
Is 0 velocity and 0 acceleration correctly describes the velocity and acceleration of the rock at the exact top of its path?
No. Any object that was shot by gun, flung by slingshot, or thrown by hand, begins accelerating downward at the acceleration of gravity as soon as it leaves the propulsion system. Zero velocity is true at the top, but acceleration is constant throughout the trajectory ... 9.8 m/s downward.
An arrow is shot straight up at an initial velocity of 200 ms. How long will it be in the air before beginning to fall?
The time the arrow will be in the air before beginning to fall can be calculated using the formula t = (final velocity - initial velocity) / acceleration. Since the arrow is shot straight up, the final velocity at the top of its flight is 0. Given the initial velocity of 200 ms and acceleration due to gravity of -9.81 m/s^2, the time in the air before beginning to fall is approximately 20.4 seconds.
When tossing a coin upwards what happens to its velocity while ascending what happens to its acceleration?
As the coin is tossed upwards, its velocity decreases until it reaches its highest point where it momentarily stops before coming back down. The acceleration due to gravity is acting against the coin's motion, causing it to decelerate while ascending.
Can velocity of an object be in different direction than the acceleration?
Yes. For example, a ball thrown vertically in the air has a positive velocity (upwards) but a negative acceleration due to gravity (downwards at ~9.81 m/s^2), until it begins to move downwards.
What will the velocity and acceleration be of a ball at its highest trajectory point just before it starts to fall?
The acceleration of the ball (after it leaves the thrower's hand) is the acceleration due to gravity, g.1 The vertical velocity of the ball at its apex is zero. The horizontal velocity is constant throughout the ball's flight; it is whatever it was at the outset of its arc.2 ---------------- 1. The acceleration due to gravity, g, is -9.8 m/s2 or -32.2 ft/s2. 2. Ignoring the effects of air resistance, which tend to slow things down.
