Newton’s 1st, 2nd, or 3rd?
Net Force
Speed, Velocity, Acceleration
Equations
FBD's
100
F = ma
Newton’s 2nd Law
100
When forces are balanced, net force is
Zero
100
Velocity is just speed and _________.
Direction
100
An object has an acceleration of 2 m/s/s. If its mass is 2 kg, what is the net force on it?
4 Newtons
100
An object is sitting on a table, motionless. What is the upwards force acting on it?
Normal Force
200
Skateboard stops, skateborder keeps going
Newton’s 1st Law
200
Newton’s 2nd Law: Net force is equal to _______ x _______.
Mass x Acceleration
200
When you are accelerating, that means you are speeding up, _______________, or changing direction.
Slowing Down
200
If an object has a net force of 10 N and a mass of 2 kg, what is its acceleration?
5 m/s2
200
A tire swing is hanging motionless from a rope. What is the upwards force acting on it?
Tension
300
Swimmer pushes water back, water pushes swimmer forward.
Newton’s 3rd Law
300
The Net Force on this object (strength + direction)
30N Left
300
When your acceleration is zero, your velocity is __________.
Constant
300
The force of a spring is Fs = - k Delta x. What do we call the variable k, and what does it mean?
The Spring Constant, it tells us the strength of the spring.
300
An object is being pushed across the floor to the right. What is the leftwards force on the object?
Friction
400
As mass goes up, acceleration goes down
Newton’s 2nd Law
400
The Net Force on this object (strength and direction)
10N Left
400
If an object is speeding up, that means its acceleration is: a) Positive, b) Negative, c) Zero, d) Increasing, e) Decreasing
(A)Positive
400
The equation for Friction is Ff = mu FN. What is mu called, and what does it represent?
Coefficient of Friction, roughness/smoothness of the surfaces in contact.
400
The only force acting on an object in freefall.
Gravity
500
A person is standing inside a public bus. The bus starts moving, and the person stumbles and falls backwards.
Newton’s 1st Law
500
An elevator is moving up an elevator shaft slowing down. What is the strongest force that is acting on it?
Gravity
500
The acceleration of objects on Earth due to gravity. (Answer with a number and units)
9.8 m/s2
500
Find the acceleration of this object.
2 m/s2 Up
500
A hockey puck is gliding at a constant speed across frictionless ice. Name each force acting on it.
Normal Force, Gravity