Topic 5a- Forces Flashcards
What is the resultant force?
The net force acting upon an object.
What is Newton’s first law of motion?
An object remains stationary or moves at a constant velocity unless being acted upon by an external resultant force.
What is Newton’s second law of motion?
The resultant force = mass x acceleration
What is Newton’s third law of motion?
If object A exerts a force on object B, object B exerts an equal and opposite force on object A.
What is the equation for stopping distance?
Thinking distance + braking distance
What are vector quantities?
Quantities that have both magnitude and direction
What are scalar quantities?
Quantities that have magnitude but no direction
Give examples of contact forces
- friction
- air resistance
- tension
- upthrust
- normal contact
Give examples of non-contact forces
- magnetic force
- electrostatic forces
- gravitational forces
What are the two important effects of gravity?
- On the surface of a planet, it makes all things accelerate towards the ground
- It gives everything a weight
What unit is weight measured in?
Newtons
What is the gravitational field strength on Earth?
~9.8N/kg
What is the gravitational field strength on the moon?
1.6N/kg
What does it mean if an object is at equilibrium?
The resultant force acting upon it is 0N
What is work done?
Work done is the energy transferred when a force moves an object through a distance
