Physics 3.5

Question 1

What is Newtons first law?

Answer 1

-A body will remain at rest or continue to move at a constant speed unless an external force acts on it

Question 2

What is Newtons Second law?

Answer 2

-The resultant force of an object is proportional to the rate of change of momentum of that object and the direction of the momentum change is the same as the direction of the force

Question 3

What is the equation for Newtons second law?

Answer 3

-F=m*a

Question 4

What is Newtons third law?

Answer 4

-If an object(a) exerts a force on an object(b) the object(b) will exert an equal and opposite force on object a

Question 5

What are the conditions for Newtons third law?

Answer 5

-The forces must be the same type
-Forces must be in opposite directions on different objects

Question 6

What is momentum?

Answer 6

-An object that has both mass and velocity has a momentum
-Vector quantity
-Momentum is directly proportional to mass and velocity

Question 7

What is the conservation of momentum principle?

Answer 7

-The total momentum before a collision is equal to the total momentum after the collision, provided no external forces are involved

Question 8

Do revision cards

Question 9

What is the area under a force time graph equal to?

Answer 9

-Change in momentum
-Change in momentum=average force* change in time

Question 10

What is an elastic and inelastic collision?

Answer 10

-Elastic collision is one in which the momentum and kinetic energy are consevered e.g collisions between gas particles
-An inelastic collision is one in which the momentum is conserved but the kinetic energy is transferred to other energy forms.