Formulas
Recall the formula for distance.
Distance = Average Speed / Time
Recall 3 scalar quantities:
Distance, Speed, Mass, Energy, Volume, Temperature, Density
D/N
What is the name of Newton's first law?
Inertia
Calculate the speed if Tony runs 1.6km in 7.5 minutes.
3.56m/s
Recall the unit for Velocity
m/s
⦻
Recall the formula for momentum.
P = M x V
Momentum = Mass x Velocity
Outline the difference between scalar and vector quantities.
Scalar: Magnitude Only
Vector: Magnitude & Direction
What is the formula for Newton's Second Law?
Force = Mass x Acceleration
A 70 kg skater pushed by a friend accelerates 5 m/s². How much force did the friend apply?
350N
Describe how to determine the speed from a distance-time graph.
Speed = Distance / Time (Rise / Run)
Recall the formula for acceleration.
Acceleration = change in velocity ÷ time taken
⦻
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.
Describe Newton's First Law.
An object will remain at rest, or constant motion, unless acted upon by an external force.
D/N
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
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.
Recall the formula for weight.
weight = mass × gravitational field strength
Recall the unit for Weight
Newtons (N).
Outline Newton’s Third law of motion
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
⦻
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
Recall the formula for uniform acceleration.
v2-u2 = 2 ✕ a ✕ x
Recall the unit for momentum
kg m/s
⦻
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.
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
Rearrange the uniform acceleration formula to determine distance.
x = (v2-u2) / (2 ✕ a)