Newton's Laws
Levers
Calculations
Random
Projectile Motion and Fluid Mechanics
100

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.

100

What class lever is a bottle opener?

Second class lever

100

What force is needed to accelerate a 36kg mass by 3m/s/s?

108N

100

What are three ways to improve someone’s stability?

Bigger base of support

Lower CoG

Move the position of the Line of Gravity

100

What is the optimal angle of release for optimal distance?

45 degrees

200

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.

200

What would someone do to a lever to increase the velocity that it can generate?

Increase the effort arm

200

A race car accelerates from 18.5m/s to 68.5m/s in 2 seconds. What is the cars acceleration?

25m/s

200

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

200

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

300

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.

300

Provide an example of each type of lever

See-saw

Wheelbarrow

Fishing rod

300

A runner sprints a 100m race in 10 seconds. What was the velocity?

10 m/s

300

List and describe four biomechanical principles involved in tennis.

Topspin

Backspin

Magnus effect

Bernoulli’s principle

300

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’

500

What is momentum equal to?

Force in kg x speed in m/s

500

Using the below information, calculate the force required to lift the weight. R arm= 14 inches, F arm= 2 inches, R=16lbs.

112 lbs

500

A runner runs a 400m track in 38 seconds. What was his velocity?

0 m/s

500

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

500

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