Forces
A force is...
A push or a pull on an object.
Which law explains why an object at rest stays at rest unless acted upon by a force?
Newton's First Law
What term describes the speed of an object in a specific direction?
velocity
What two factors determine an object's momentum?
Mass and velocity
If the mass of an object increases while the net force remains constant, what happens to the acceleration of the object?
The acceleration will decrease.
What force opposes the motion of two surfaces sliding past each other?
Friction
Which law states that for every action, there is an equal and opposite reaction?
Newton's Third Law
What property of an objet does not change regardless of its location in the universe?
Mass
What is the equation for momentum?
P= mass x velocity
If an object is moving at a constant velocity, what is the net force acting on it?
The net force is 0 N.
If two unequal forces are applied to an object in opposite directions, what will happen to the object?
The object will accelerate in the direction of the stronger force.
What does Newton's second law explain?
How forces cause acceleration.
What is the rate of change of velocity called?
Acceleration
What must be true for momentum to be conserved in a system?
The objects must only interact with each other, no other forces are interacting with the system.
A net force of 10N is applied to a 5 Kg object. What is the acceleration of the object?
The acceleration will be 2 m/s2
How can you reduce the force felt when catching a ball?
By pulling your hand back to increase the time of impact
When a baseball bat hits a ball, which statement best describes the forces involved according to Newton's third law?
The force exerted by the ball on the bat is equal in magnitude and opposite in direction to the force exerted by the bat on the ball.
What unit is used to measure momentum?
Kilograms x meters/second
What does it mean if an object has a high momentum?
It has a high mass or a high velocity.
A 2 kg object is subjected to a net force of 6 N. What will be the acceleration of the object?
The object will accelerate at 3 m/s2
If a puck is hit with a hockey stick, what determines how long it accelerates?
The time the stick is in contact with the puck.
According to Newton's 2nd Law of Motion, what happens to an object when a net force is applied to it?
The object will accelerate in the direction of the net force.
What is the term for the change in momentum of an object when a force is applied over time?
impulse
What happens to the force on an object if the time over which momentum changes is increased?
The forces decrease.
If the net force on an object is doubled, what happens to the acceleration of the object, assuming the mass remains constant?
The acceleration will double.