Forces

Question 1

If a force is going up in a vertical plane, is it positive or negative?

Answer 1

Positive, example being upthrust

Question 2

Example of a negative downward force?

Answer 2

Weight

Question 3

If a force is going left in horizontal plane, is it positive or negative?

Answer 3

Negative, example being drag

Question 4

Example of a positive force moving right

Answer 4

Thrust

Question 5

Equation for resultant force including mass

Answer 5

Resultant force = Mass X Acceleration
FR = m x a

Question 6

Equation for resultant force including 2 forces

Answer 6

Resultant force = Force 1 + Force 2
FR = Thrust + Drag
FR = T + D
If T = 100 N
If D = -50 N
FR = 100 + (-50)
FR = 50 N

Question 7

If you are asked for resultant force but you only have 1 force and its the Upthrust and you have the mass what do you do?

Answer 7

You calculate the weight assuming gravity is 10 unless specified by the question and then you use the Weight and the Upthrust to calculate the Resultant Force.

Question 8

What is Newtons 1st Law?

Answer 8

When the force on a system are balanced and so FR = 0, the object will not accelerate.

Question 9

The 2 possible states of motion from newtons 1st law

Answer 9

Stationary
Moving at a constant velocity.

Question 10

When does a body comply with newtons 2nd law

Answer 10

The forces are unbalanced
There is a resultant force
The object will be forced to accelerate

Question 11

2 things an object can do to accelerate

Answer 11

Change speed
Change direction