Forces

Question 1

What is force measured in?

Answer 1

Newtons

Question 2

A force is either . . . ?

Answer 2

A push or a pull

Question 3

What is the definition of contact and non-contact forces?

Answer 3

A contact force is where the force is experienced when two objects are touching.
A non-contact force is where objects don’t have to be touching to experience the force.

Question 4

What are some examples of contact forces?

Answer 4

Upthrust, friction, air resistance, normal force, thrust, tension.

Question 5

What are some examples of non-contact forces?

Answer 5

Gravitational field strength (weight), magnetic, electro-static.

Question 6

What is the resultant force?

Answer 6

The resultant force is the affect of the forces once all of the forces have been in action. For example, if an object is on a surface, and there is 5N of weight going down and 5N of normal force going up, the resultant force would be 0N.

Question 7

What happens to an object if a resultant force is acting on it?

Answer 7

It will either:
1. Accelerate the object (in a positive or negative direction)
2. Change the direction of the object
3. Change the shape of the object

Question 8

If an object is moving at a constant speed, what is the resultant force on that object?

Answer 8

Zero Newtons (0N)

Question 9

If there is no resultant force acting on a object then what must it be doing (two options)?

Answer 9

According to Newton’s first law, it will be either stationary or moving at a constant speed.

Question 10

What are resultant force diagrams?

Question 11

How do you draw a resultant force diagram?