Newtons laws

Question 1

Force production

Answer 1

Force is the pulling or pushing effect of a body on another body
Forces are applied when 1 body comes into contact with another body. A force is required to initiate, slow down or stop movement of an object. It is measured in Newtons (N).

Question 2

Newton’s First Law of Motion

Answer 2

“A body continues in its state of rest or state of motion unless acted upon by a force”. e size of the force required to change the state of motion of an object depends on the mass of the object. The greater the mass of the object, the greater the force needed to move it.

Question 3

Inertia

Answer 3

is the term used to describe the amount of resistance to a change in an objects state of motion
The greater an objects inertia, the greater the force required to initiate its movement or change its state of motion.
Is directly proportional to an objects mass

Question 4

Newtons second law of motion

Answer 4

“The rate of change of acceleration to a body is proportional to the force applied to it”.
The greater the force applied to an object, the faster the acceleration will be.
Acceleration is directly proportional to the force applied.

Question 5

Momentum

Answer 5

Momentum = mass × velocity
An object can only have momentum if it is moving.
The greater its momentum, the more force that needs to be applied to either stop or slow the object down.
As a result, when two bodies collide, the one with the most momentum will be less affected

Question 6

Impulse momentum relationship

Answer 6

The longer a force can be applied, and the greater the force that is applied, the greater the object’s impulse or change of momentum.

Question 7

Impulse and sport

Answer 7

1. increasing momentum- in hockey, a hit will place a large force, but over a small time. A drag flick would use a smaller force over a longer period of time. Either way the ball will increase its momentum
   Ideally we look to maximize both force and time, however the human body rarely allows for this to happen.
2. decreasing momentum- A cricket ball is hit towards a fielder. The fielder wishes to stop the ball Would he apply a large force over a short period of time. Would he apply a small force over a longer period of time. Therefore in stopping a force we usually increase the time component so we can reduce the peak force!

Question 8

Newtons third law of motion

Answer 8

“For every action, there is an equal an opposite reaction”. When two objects act upon each other, the forces are opposite in direction and equal in magnitude.

Question 9

Impulse and accuracy

Answer 9

Flattening the swing arc- Good technique can↑ contact time with a ball during collision sports. May provide opportunity for ↑ force application in desired direction (hockey drag flick). May also provide ↑ accuracy, however usually occurs with a ↓ in force application.