Newtons laws

Question 1

Define gravitational force( Fg)

Answer 1

The force the earth exerts on any object on or near the earth

Question 2

Define Normal force ( Fn)

Answer 2

The perpendicular force exerted by a surface on an object in contact with it

Question 3

Define frictional force ( Ff)

Answer 3

The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact

Question 4

Distinguish between static and kinetic friction forces

Answer 4

• Static frictional force: the force that opposes the tendency of motion of a stationery object relative to a surface
• kinetic frictional force: the force that opposes the motion of a moving object relative to a surface with which it is in contact with

Question 5

Define Newton’s 1 law.

Answer 5

A body will remain in it’s state of rest or uniform velocity unless acted upon by a net or resultant force.

Question 6

What is newtons 1 law also know as?

Answer 6

The law of inertia

Question 7

Define inertia

Answer 7

The property of an object that causes it to resist a change in its state of rest or uniform motion

Question 8

Discuss using newtons law why it is important to wear seatbelts

Answer 8

We should wear seatbelts in order to prevent us from going in the same speed and direction that the car would go in if we were to experience a car crash

Question 9

Define newtons 2nd law

Answer 9

When a net force is applied to an object of mass, it accelerates in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass

Question 10

Define Newton’s third law

Answer 10

When object a exerts a force on object b, object b simultaneously exerts an oppositely directed force of equal magnitude on object a