F
What is Newton's Third Law?
For every action there is an equal and opposite reaction
What is Newton's Second Law?
F=mXa
True or False, and explain why. The heavier the person, the less inertia that person’s body has.
False. The heavier will have more inertia as it has more stored potential energy when at rest and more kinetic energy when moving.
Force is simply described as......
A Push or a Pull
What unit do we measure energy in?
Joules
What is Newton's First Law?
An object at rest will stay at rest unless acted upon by an unbalanced force or until another force is applied to it
An object with more mass requires ________ _________ for it to move.
More force
Which is faster, 45km/h or 15m/s? Show all working in the space provided.
*hint: to convert km/h to m/s, divide by 3.6.
15m/s is faster. 45/3.6 = 12.5m/s.
What are the two components of velocity?
Speed and direction
What is the formula for calculating kinetic energy?
mass X velocity2 / 2
What is the formula for Force?
Force= mass X acceleration
You're travelling in a car, when the brakes are suddenly applied. What will happen to your body and what do we call this phenomenon?
Your body will lurch forward and we call this Inertia.
What is the speed in m/s of a sprinter running a distance of 400m in 65 seconds?
6.15m/s
What are balanced forces?
A. Two things rubbing together
B. Forces that are equal in size and opposite in direction
C. The Laws of Motion
B. Forces that are equal in size and opposite in direction
What is the formula for acceleration?
Final velocity - Initial Velocity / time
What do we call an objects resistance to changes in it's motion?
Inertia
This slows an object when an opposite force acts upon it
Friction
What is the acceleration of a bike rider which starts at rest (0 m/s) and reaches a final velocity of 45m/s in 9 seconds?
5m/s2
Which has more inertia, a semi truck or a car?
A semi truck
A car of mass 700kg has to be pushed to have an acceleration of 0.05 m/s2 before it can start. Calculate the force needed to push the car.
What is the force acting on a object weighing 7kg if it's accelerating at 20m/s?
F=mXa
F=7X20 = 140N
The amount of matter stored in an object
Mass
Describe any three safety features in a car.
Crumple zones, seatbelts, airbags.
Describe Newtons 3rd Law - word for word!
For every action there is an equal and opposite reaction.
Describe the 'Law of Conservation of Energy'.
Energy is not created or destroyed, it is transferred or transformed.