Phys 2: Forces and Motion

Formulas

100

Recall the formula for distance.

Distance = Average Speed / Time

200

Recall the formula for momentum.

P = M x V

Momentum = Mass x Velocity

300

Recall the formula for acceleration.

Acceleration = change in velocity  ÷ time taken

 ⦻

400

Recall the formula for weight.

weight = mass × gravitational field strength

500

Recall the formula for uniform acceleration.

v²-u² = 2 ✕ a ✕ x

Quantities

100

Recall 3 scalar quantities:

Distance, Speed, Mass, Energy, Volume, Temperature, Density

D/N

200

Outline the difference between scalar and vector quantities.

Scalar: Magnitude Only

Vector: Magnitude & Direction

300

A bus is turning a corner at a speed of 30mph. Outline why the velocity changes.

Velocity is a vector quantity, and as the direction changes so does the velocity.

400

Recall the unit for Weight

Newtons (N).

500

Recall the unit for momentum

kg m/s

 ⦻

Newton

100

What is the name of Newton's first law?

Inertia

200

What is the formula for Newton's Second Law?

Force = Mass x Acceleration

300

Describe Newton's First Law.

An object will remain at rest, or constant motion, unless acted upon by an external force.

D/N

400

Outline Newton’s Third law of motion

When a force is exerted on an object, there is an equal, and opposite force exerted back. 

500

Describe the relationship between Force and Acceleration in terms of Newtons Second Law.

Force and Mass are directly proportional. If you increase the force, you will increase the acceleration on an object.

Calculations

100

Calculate the speed if Tony runs 1.6km in 7.5 minutes.

3.56m/s

200

A 70 kg skater pushed by a friend accelerates 5 m/s². How much force did the friend apply?

350N

300

A Car accelerates at a constant rate in a straight line. The velocity of the car increases from 0 m/s to 28 m/s in 14 seconds. Calculate the acceleration of the car.

2m/s²

400

If a 81 kg person on a 9.6 kg sled is pushed with a force of 315N, what will be the person's acceleration?

3.48m/s

 ⦻

500

A ball is falling with a velocity of 16.2m/s and has a mass of 3.8kg. It hits the ground for a time of 1.21s. Calculate the magnitude of the force exerted by the ball on the floor.

50.88N

D/N

Pot Luck

100

Recall the unit for Velocity

m/s

 ⦻

200

Describe how to determine the speed from a distance-time graph.

Speed = Distance / Time (Rise / Run)

300

Outline how to determine the distance travelled in a velocity-time graph.

Find to total area under the graph, break the graph into triangles and rectangles and add up the total area.

400

For motion in a circle there must be a resultant force known as _____________ that acts towards the centre of the circle.

Centripetal Force

D/N

500

Rearrange the uniform acceleration formula to determine distance.

x = (v²-u²) / (2 ✕ a)