Newton's 2nd Law
An object has a mass of 65 kg. It accelerates at a rate of 5 m/s. What must be the net force acting on the object?
325 N
What does Newton's 3rd Law say?
Every action has an equal and opposite reaction.
What does Newton's 1st law say?
Objects at rest will stay at rest unless acted upon by an unbalanced force.
Objects in motion will stay in motion unless acted upon by an unbalanced force.
Which universal force can attract or repel charged objects or particles?
Electromagnetic
What is the term used to describe the overall force acting on an object?
Net Force
A force of 954 newtons is applied to a storage crate to lift it off the ground. If the storage crate has a mass of 679 kg, what is its acceleration?
1.41 m/s2
What two conditions are required for momentum to be conserved?
1) Closed system.
2) No external forces can be acting on the system.
If a bowling ball has a mass of 2.75 kg, what is its weight?
27 N
Which universal force holds together the nucleus of the atom?
Strong nuclear
What kind of force does a skydiver experience when he opens his parachute?
Fluid Friction
A child on a sled is accelerating down a steep hill at a rate of 12 m/s2, if the combined mass of the child and sled is 50 kg, what must be the net force?
600 N
If an elephant is running at a velocity of 11 m/s, and it has a mass of 120 kg, what is the elephant's momentum?
1,320 kg m/s
What two forces does a box that is sliding across a table experience?
Applied force (or air resistance)
Which universal force acts on all particles?
Weak nuclear
If a force of 5 N acts on an empty crate, and then a crate full of bricks, will both crates accelerate at the same rate?
No!
If a race car is traveling at a constant speed or sitting at rest, what must be the net force acting on it?
0 N
If a girl on roller skates travels at a velocity of 37 m/s, and has a momentum of 1,775 kg m/s. What is the mass of the girl?
49.97 kg
What happens to objects that experience unbalanced forces?
They accelerate!
What direction to magnetic field lines point?
From North to South?
What is the term used to describe the speed that a falling object reaches just before it hits the ground?
Terminal Velocity
An object experiences 500 forces, all of which are balanced. Does the object accelerate?
No!
A dog has a momentum of 122 kg m/s and is running at a constant velocity of 13 m/s. What is the mass of the dog?
9.4 kg
If an object weighs 412 N, what is its mass?
42 kg
Which universal force is always attractive and depends on the mass and distance between two objects?
Gravitational
What is the definition of inertia?
The tendency for an object to resist changes in motion.