Resultant forces

Question 1

How do you calculate the resusltant force

Answer 1

You work out the difference between the forces acting on it in opposite direcitons

Question 2

If the resultant force of an object is 0N what two things could this mean?

Answer 2

Moving at a constant speed (if there is a driving force)

Stationary (if there is no driving force)

Question 3

If the driving force is greater than the frictional force then the object is _ _ _ _ _

Fll in the blank

Answer 3

Accelerating as the resultant force is moving in a forward direction

Question 4

If the frictional force is greater than the driving force the the object is _ _ _ _ _ _

Answer 4

Decelerating as the resultant force ismoving in a backwards direction

Question 5

If a resultant force is acting on a stationary object what will happen to the object?

Answer 5

It will accelerate

Question 6

If a resultant force is acitng in the opposite direciton to a moving object, what will happen

Answer 6

The object will decelerate

Question 7

If no resultant force is acting ona moving object, what will happen?

Answer 7

It will move at a constant speed

Question 8

If there is no resultant force acting on a stationary object, what will happen

Answer 8

The object will be stationary

Question 9

Name the four different forces that act on a plane

Answer 9

Weight

Lift

Thrust

Air resistance

Question 10

How would you calculate the direction of the resultant force after drawing a scale diagram?

Answer 10

Use a protractor to measure the angle between resultant force and horizontal line
The direction = X degrees horizontal

Question 11

What is meant by the components of a force

Answer 11

The vertical and horizontal magnitudes of the force at a given angle

Question 12

How do you draw a vector diagram to find the resultant force of the components of a force acting at a given angle?

parallelogram

Answer 12

1. Use a suitable scale
2. Draw the vertical and horizontal components TIP to TAIL making sure to use a protractor to measure the given angle between them
3. Then make a parralelogram by drawing a copy of the vertical component next to the original horizontal at the given angle and a copy of the horizontal component next to the vertical component at the same given angle
4. Draw a straight line from the tails on the original components to the other side of the parallelogram at the copied side
5. Measure the length of the line
6. Convert the length to the desired units using the scale

Question 13

What is meant by resolving forces?

Answer 13

A single force can be resolved into two components at right angles to eachother

Question 14

How do you draw a vector digram to show resolving a force
(using a diagram to find the components of the force at a given angle)

do on paper

Answer 14

1. Create a suitable scale
2. Draw an x-axis and y axis.
3. Using a protractor, measure the given angle and draw the force at that angle- using a ruler to measure the length of the line using the scale you made
4. Draw straight dashed lines from the end of the line to the x-axis and y-axis
5. Use a ruler to measure the length between the beginning of the vertical and horizontal axis to the point at which the dashed lines from the o.g force meet the axis.
6. These lengths are the vertical and horizontal components, now you MUST convert them into the desired units.
7. Done