# What would Dr Hewitt need to have done to exert an even greater force than he did in his karate demonstration?

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## What would Dr Hewitt need to have done to exert an even greater force than he did in his karate demonstration?

To exert an even greater force than he did in his karate demonstration, Dr. Hewitt would need to increase his speed.

## Which has more momentum a 1 ton car moving at 100km h or a 2 ton truck moving at 50km h?

Which has more momentum: a 1-ton car moving at 100 km/h or a 2-ton truck moving at 50 km/h? Both have the same momentum (1 ton × 100 km/h = 2 ton × 50 km/h).

## Which has greater kinetic energy?

Also, kinetic energy is proportional to the square of velocity hence, lighter body has greater kinetic energy.

## Do a baseball and a golf ball have the same momentum which has the greater kinetic energy?

Since both the baseball and golf ball have the same momentum, p, but different mass, the baseball which has a greater mass would have a smaller KE and the golf ball which has a smaller mass would have a greater KE.

## What will happen to the object if too much force will be exerted to it?

A net force on an object changes its motion – the greater the net force, the greater the acceleration. More massive objects require bigger net forces to accelerate the same amount as less massive objects.

## Why is it advantageous for a boxer to ride with the punch?

Ride with the punch Whether moving toward or away from the punch, momentum undergoes a change. When the boxer moves away, he “rides with” the punch and extends the time during which the punch is applied. This is very advantageous, for the extended time means diminished force (Figure 2a).

## What is the formula for momentum speed?

p = m v . You can see from the equation that momentum is directly proportional to the object’s mass (m) and velocity (v). Therefore, the greater an object’s mass or the greater its velocity, the greater its momentum. A large, fast-moving object has greater momentum than a smaller, slower object.

## Which has a greater momentum a 1000 kg truck at rest or a 100 kg bicycle in motion?

Taking the formula for momentum to be p=mv this is the mass multiplied by the velocity. Although the semi truck certainly has a larger mass, it is not in motion and therefore does not have any momentum. The bicycle however has both mass and velocity and therefore has the larger momentum of the pair.

## How is momentum calculated?

Momentum (P) is equal to mass (M) times velocity (v). But there are other ways to think about momentum! Force (F) is equal to the change in momentum (ΔP) over the change in time (Δt). And the change in momentum (ΔP) is also equal to the impulse (J).

## Why light is called form of energy?

Light energy is a kind of kinetic energy with the ability to make types of light visible to human eyes. Light is defined as a form of electromagnetic radiation emitted by hot objects like lasers, bulbs, and the sun. Light contains photons which are minute packets of energy.

## Can a body have energy without momentum?

A body can have energy without having momentum if it possess potential energy but if body possess momentum then it must posses kinetic energy. Momentum and energy have different dimensions.

## Can kinetic energy be negative?

Because mass can’t be negative and the square of speed gives a non-negative number, kinetic energy can’t be negative.

## What is the SI unit of momentum?

Momentum | |
---|---|

SI unit | kilogram meter per second (kg⋅m/s) |

Common symbols | p, p |

Other units | slug⋅ft/s |

Dimension | MLT^{−}^{1} |

## Which ball will change more momentum?

(ii) The momentum of each ball will change by the same amount because the total momentum of the system (both balls) is conserved according to the law of conservation of momentum. However, the tennis ball will experience a larger change in momentum in proportion to its smaller mass, compared to the football.

## Which ball has more momentum and why?

A bowling ball has more mass than a golf ball. More mass means more momentum.

## Why is a force that is applied for a short time more effective in karate?

Answer and Explanation: From the equation, the numerator m Δ v is divided by the denominator whose value is small because of the short time application. Hence, the average force that is generated by a change in momentum would be much greater than that applied for a longer time.

## What depends on the amount of force exerted and the distance over which the force is applied?

Work is a transfer of energy so work is done on an object when you transfer energy to that object. The amount of work done on an object depends on the amount of force exerted on the object and the amount of distance the object moves.

## What is the force which brings the egg to rest upon hitting the sheet?

Final answer: The force that brings the egg to rest upon hitting the sheet is friction.

## Is it correct to say that impulse is equal to?

Key terms. Product of the average force exerted on an object and the time interval during which the force is exerted. Impulse is equal to the change in momentum ( ) and is sometimes represented with the symbol .