Newton's Laws
What is Newton’s 1st law? Use and example.
a body will remain at rest or in motion in a straight line unless an external force acts upon it to change that state.a body will remain at rest or in motion in a straight line unless an external force acts upon it to change that state.
What class lever is a bottle opener?
Second class lever
What force is needed to accelerate a 36kg mass by 3m/s/s?
108N
What are three ways to improve someone’s stability?
Bigger base of support
Lower CoG
Move the position of the Line of Gravity
What is the optimal angle of release for optimal distance?
45 degrees
What is Newton's 2nd Law?
the greater the force acting on a body, the greater its resulting acceleration. For example, a bunted softball does not go as far as one that is hit hard.
What would someone do to a lever to increase the velocity that it can generate?
Increase the effort arm
A race car accelerates from 18.5m/s to 68.5m/s in 2 seconds. What is the cars acceleration?
25m/s
Why are starting blocks angled?
For every force there is an equal and opposite force. Pushing against the angled blocks will drive the runner forward
Using a diagram, explain the shape of wing and how it assists the plane in flight.
Particles split and will re-join at the back of the plane. Flat surface higher pressure. Curved surface lower pressure. Air moves from high to low pressure. Plane lifts up
What is Newton's 3rd Law?
for every action there is an equal and opposite reaction. For example, to enable us to jump, we push down. To swim forward, we pull back.
Provide an example of each type of lever
See-saw
Wheelbarrow
Fishing rod
A runner sprints a 100m race in 10 seconds. What was the velocity?
10 m/s
List and describe four biomechanical principles involved in tennis.
Topspin
Backspin
Magnus effect
Bernoulli’s principle
Draw a diagram and explain the Magnus effect.
Boundary layer. High pressure and low pressure – may be due to seam, smoother surface or spin imparted on the ball. Turbulence effects the boundary layer. Air moves from high pressure to low pressure and causes the ball to ‘lift’
What is momentum equal to?
Force in kg x speed in m/s
Using the below information, calculate the force required to lift the weight. R arm= 14 inches, F arm= 2 inches, R=16lbs.
112 lbs
A runner runs a 400m track in 38 seconds. What was his velocity?
0 m/s
Explain rotational inertia using an example. Talk about some of the it’s characteristics.
When an object turns around an axis. The larger the mass the higher the inertia, the further the mass away from the axis the higher the inertia
Explain the biomechanical principles involved in swimming?
Drag – by change of hand position, high pressure to low AND on the body position in the water
Buoyancy
Pushing against the water to propel yourself forward