No, work has nothing to do with time. power depends on timeso it takes more power to lift it faster.

Does the work required to lift a book to a high shelf depend on how fast you lift the book?

Does the force required to lift a book depend on how fast you lift it? explain. Do not, Work is not a function of time. However, strength is a function of time, so the strength required to lift a book does depend on how fast you lift it.

What happens to energy when you lift weights?

When an object is lifted, the job is done. When work increases the height of an object, Energy is transferred as a gain in the gravitational potential energy of an object. For example, let’s say you lift a quality suitcase through a height. The weight of the suitcase is the downward force of magnitude.

How much work do weightlifters do when lifting weights?

In the example above, what the lifter does when he lifts the weight is 980 joules. To do this work, energy has to be transferred. The 980 joules of chemical energy in the food the weightlifter eats is transferred to the 980 joules of gravitational potential energy on the barbell.

What energy does a trampoline transmit?

When you leave the trampoline and start traveling upward, your kinetic energy The further up you go, the less you go. In other words, you slow down. As you slow down and gain altitude, your kinetic energy is converted into potential energy. Likewise, when you fall, your height decreases, which reduces your potential energy.

Physics 8 Work, energy, and power (20 of 37) Climbing stairs

27 related questions found

Are forces applied to moving objects always valid?

If force is applied but Object doesn’t move, doesn’t do any work; If a force is applied and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object were moved a distance d in the direction of the applied force. …

Why doesn’t it work when you walk a horizontal distance of 200 m on a 2 kg backpack?

A body of about 2 kg slides over a frictionless surface at constant speed, moving 5 m to the right. None of these forces work.When they generate a force, they do no work 90 degrees with the displacement angle. No work is done.

When the work is done, do we know it’s because there is?

You know the work is done if both of the following conditions are met: Object moves when force is applied. The object moves in the same direction as the applied force.

What is the difference between work and power?

Work refers to the process of transferring energy to the motion of an object by applying a force. It is usually expressed as the product of displacement and force. Power is the energy delivered per unit of time.The formula for calculating power is work = force * displacement.

Under what circumstances did it not work?

If the force is perpendicular to the displacement direction, the work done is zero. When the displacement is in the opposite direction to the force, the work done is negative.

What can say that work is done physically?

The work is said to have been completed When a force applied to an object moves that object. We can calculate work by multiplying the force by the motion of the object.

How do you address power?

Power is a measure of the amount of work that can be done in a given time. Power equals work (J) divided by time (s). The SI unit of power is the watt (W), which is equal to 1 joule of work per second (J/s). Power can be measured in units called horsepower.

How to calculate acceleration?

Acceleration (a) is the change in velocity (Δv) over time (Δt) and is expressed by a = Δv/Δt. This allows you to measure the speed of change in meters per second squared (m/s^2). Acceleration is also a vector, so it includes magnitude and direction.

What causes all objects to move?

For moving objects, we have must be a forceA force is a pushing or pulling force that causes an object to move, change direction, change speed, or stop. … However, not all forces cause motion. Some forces, like gravity and friction, resist or oppose motion.

How can you consume energy without doing work?

This energy comes from chemical energy in your body, most of which is converted into heat and dissipated into the surrounding environment.In this case, there is no energy transfer to the book, so no work. When your arms are stretched at different angles, you will feel different energy expenditure.

Why are negative forces attractive?

According to Coulomb, the electricity of a stationary charge has the following properties: Charges repel each other; not as attractive as a fee. Therefore, two negative charges repel each other, while one positive charge attracts one negative charge. Attraction or repulsion works along the line between the two charges.

Can completed work be 0?

zero work done When the displacement of the object is zero or vertical (θ=900, cosθ=0) to the direction of the applied force, the work done is zero. …so the applied force and displacement are in the vertical direction. So there is zero work done.

What is the average acceleration formula?

Average acceleration is the rate of velocity change:-a=ΔvΔt=vf-v0tf-t0, where -a is the average acceleration, v is the velocity, and t is the time. (The bar above a represents the average acceleration.)

How much constant acceleration is required to increase velocity?

an acceleration 8.8 ft/sec^2 The speed needs to be increased from 26 mph to 56 mph in 5 seconds.

What are the 3 equations for power?

P = ΔV2 / R

We now have three power equations, two of which are derived from the first using Ohm’s law equations. These equations are often used for problems that involve calculating power from known values ​​of potential difference (ΔV), current (I), and resistance (R).

How do you get a job when given power and time?

The formulas for power, work and time can be derived from each other as:

1. Power: P = W/T.
2. Work: W = P*T.
3. Time: T = W/P.
4. where P = power, W = work, and T = time.

When we say work is done?

The work is said to have been completed When a force moves an object a distance in its own direction.

When is the job said to be done?

The work is said to have been completed When the position of an object changes due to the force exerted on it.