## When traveling twice as fast your kinetic energy is increased _?

If you double the mass of an object you double the kinetic energy. If you double the speed of an object the kinetic energy increases by **four times**.

## What happens the second time Dr Hewitt lifts the bowling ball near his teeth and gives it a push?

What happens the second time Dr. Hewitt lifts the bowling ball near his teeth and gives it a push? **The ball leaves Dr.** **Hewitt and returns to him going past the point where it was released.**

## What do we call the quantity force multiplied by distance?

when the force is multiplied by the time of its application we call the **quantity impulse** which changes the momentum of that object. what do we call the quantity force x (times) distance and what quantity can this change? work.

## Which energy production method does not ultimately depend on the sun quizlet?

The energy is kinetic energy before it hits the ground it is thermal energy after. Which energy production method does not ultimately depend on the Sun? **Photovoltaic cells**.

## When the speed of an object is doubled does its kinetic energy double?

The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. If the speed of the object becomes double **its kinetic energy changes to four times the initial kinetic energy**.

## When the speed of your car is doubled by what factor does its kinetic energy increase?

When the speed of your car is doubled by what factor does its kinetic energy increase? Therefore when you double the velocity that value is then squared. Therefore your kinetic energy is increased by **4 times the original amount**.

## What happens the first time Dr Hewitt lifts the bowling ball near his teeth?

Why does the bowling ball behave the way it does the first time Dr. Hewitt lifts the bowling ball near his teeth and lets go? … **the extra energy from the push is converted into kinetic energy which is then converted into more potential energy at the end of the motion than the ball had when it was released**.

## Why do the two objects hit the table at the relative times that they do?

Why do the two objects hit the table at the relative times that they do? **Gravity pulls the same amount on both and they both drop the same distance.**

## When Dr Hewitt cuts the broom right through the center of gravity How do the weights of the two sides of the broom compare?

When Dr. Hewitt cuts the broom right through the center of gravity how do the weights of the two sides of the broom compare? **The longer side (the handle) has a greater weight than the bristle side**.

## Does twice as much work on a body mean twice as much change in energy?

If we want to change the kinetic energy of a massive object we must do work on it. For example in order to lift a heavy object we must do work to overcome the force due to gravity and move the object upward. If the object is twice as heavy **it takes twice as much work to lift it the same distance**.

## When it moves at twice the speed what will be its kinetic energy?

Because kinetic energy is proportional to the square of the velocity when velocity is doubled kinetic energy is quadrupled. So double the speed get **4 times the energy**.

## How much work is done on a satellite in a circular orbit about Earth?

If the direction of force is perpendicular to displacement then the work done is **zero**. When a satellite moves around the Earth then the force of gravity on the satellite is perpendicular to its displacement. Hence the work done on the satellite by the Earth is zero.

## When traveling twice as fast kinetic energy is increased?

The following equation is used to represent the kinetic energy (KE) of an object. This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed **the kinetic energy will increase by a factor of four**.

## What is the source of energy in sunshine quizlet?

The source of the energy of sunshine is **fusion power in the Sun**.

## What can you conclude about the total kinetic energy of the two balls?

What can you conclude about the kinetic energies of the two balls? **The two balls have the same kinetic energy.**

## When the speed of an object is doubled its momentum is?

If the velocity of a body is doubled then its momentum doubles because velocity **is directly proportional to the momentum**. So option 2 is correct.

## What happens to the kinetic energy when?

kinetic energy form of energy that an object or a particle has **by reason of its motion**. If work which transfers energy is done on an object by applying a net force the object speeds up and thereby gains kinetic energy.

## What happens to the kinetic energy of an object if it is doubled?

The kinetic energy of the object **is directly proportional to the mass** therefore on doubling the mass kinetic energy will also become double.

## When the velocity of an object is tripled by what factor does its amount of velocity change movement by what factor does its kinetic energy change?

If the particle’s kinetic energy is tripled the particle’s speed is changed by sqrt (3). The speed has increased by a factor of sqrt (3). The kinetic energy will change by a factor of **1/4**.

## How much work is done on a satellite in a circular orbit about Earth quizlet?

Terms in this set (9) A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity between the Earth and the satellite yet **no work is done on the satellite**. No work is done because there is no gravity in space.

## What are the 2 types of mechanical potential energy?

There are two main types of mechanical energy. They are **motion energy and stored mechanical energy**.

## When two vehicles collide momentum is conserved?

Truck Rear Ends Car

If there are only two objects involved in the collision then the momentum lost by one object equals the momentum gained by the other object. Certain collisions are referred to as elastic collisions. Elastic collisions are collisions in which both momentum and **kinetic energy** are conserved.

## How would the result of this experiment change if we replaced the ball with another one that has half the mass?

For now consider the following question: How would the result of this experiment change if we replaced the ball with another one that had half the mass? **The ball would still land in the cart.**

## How does the minimum force needed to hoist a load?

How does the minimum force needed to hoist a load change as you increase the number of pulleys from one to two then three then four? … The minimum force needed to hoist the load becomes **half then one-third then one-fourth**.

## What happens when you drop two objects at the same time?

Because Earth gives everything the exact same acceleration **objects with different masses will still hit the ground** at the same time if they are dropped from the same height. … The less massive the object is the more the force of air resistance slows the object down as it falls.

## Why do objects hit the ground at the same time?

**Gravity**is the force that causes things to fall to earth. When you drop a ball (or anything) it falls down. Gravity causes everything to fall at the same speed. This is why balls that weigh different amounts hit the ground at the same time.

## Why do two objects fall at the same rate?

If you neglect air resistance objects falling near Earth’s surface fall with the same approximate acceleration 9.8 meters per second squared (9.8 m/s^{2} or g) **due to Earth’s gravity**. So the acceleration is the same for the objects and consequently their velocity is also increasing at a constant rate.

## What is the center of gravity of the broom that Dr Hewitt holds up?

Where is the center of gravity of the broom that Dr. Hewitt holds up? **The shorter side where the bristles of the broom are has a greater weight than the handle**.

## Which will roll down a hill faster?

You should find that **a solid object will always roll down** the ramp faster than a hollow object of the same shape (sphere or cylinder)—regardless of their exact mass or diameter. … The answer is that the solid one will reach the bottom first.

## What is required to change the angular momentum of a system?

Angular momentum is changed by **a net external torque** but not all forces cause a torque. To produce a torque τ a force F must have a lever arm r and a component perpendicular to the lever arm.

## How much more work is done lifting a twice as heavy barbell twice as far?

How much work is done in lifting a barbell that is twice as heavy the same distance? Explanation: This is in accord with **work = force x distance**. Twice the force for the same distance means twice the work done on the barbell.

## How much work is done on a 2000 N crate that is hoisted 2 m in a time of 4 s?

Question | Answer |
---|---|

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s? | 200 x 10 = 2000 x 2m = 4000/4 = 1000 Watts |

Raising an auto in a service station requires work. Raising it twice as high in the same time requires | twice the power |

## What does it mean when work is positive?

Work can be either positive or negative: **if the force has a component in the same direction as the displacement of the object the force is doing positive work**. If the force has a component in the direction opposite to the displacement the force does negative work.

## How do you double kinetic energy?

**If you double the mass of an object** you double the kinetic energy. If you double the speed of an object the kinetic energy increases by four times.

## Mechanics of Materials – 2D Combined loading example

## EXAMPLE 6 STRUCTURAL THEORY

## Hướng dẫn load file nét in *.ctb vào Plot Styles trên phần mềm progeCAD

## Dynamics – Work and Energy example 2