Resultant force hyperlearning

• Science
• Upper Secondary (Key Stage 4)
• GCSE

Resultant Force

Hyperlearning

00:00

What is the resultant force for terminal velocity?

00:06

The downwards arrow represents which of the following forces?

1. weight
2. tension
3. friction
4. normal contact

00:09

What part of a vector quantity is shown by the arrow head?

1. magnitude
2. size
3. action
4. direction

00:18

The resultant force is the single force that has the same effect as..

1. all the individual forces acting together
2. all the individual forces multiplied together
3. all the individual forces against each other
4. all the individual forces opposing each other

00:26

What sum was done to calculate the resultant force on the rocket?

00:29

What do you think the resultant force is if the forces actin on an object are balanced?

1. 100N
2. -10N
3. 0
4. 0N

00:40

T of F: If the resultant force on an object is 0N then the object will always be stationary

00:56

Which force opposes the skydivers weight as they are falling?

1. gravity
2. driving force
3. air resistance
4. friction

01:00

At terminal velocity when the resultant force on teh skydiver is zero, what word will be used to describe his speed?

1. constant
2. accelerating
3. negative
4. instant

What are you going to learn?

In this lesson you're going to learn how to . . .

1

2

3

calculate resultant force

use resultant force to describe the motion of the object

apply your learning

Names of forces

• Driving or applied force (thrust)
• Weight
• Gravity
• Normal contact
• Drag forces; Friction, Air resistance, Water resistance
• Upthrust (buoyancy)
• Tension
• Magnetic
• Electrostatic

Forces key facts

• Measured using a Newton meter
• Measured in Newtons (N)
• Represented by an arrow on a diagram to show direction and size of force
• Act on objects and can change the speed, direction or shape
• Can be contact or non-contact
• In opposing pairs can be balanced or unbalanced

What is the name of these pieces of measuring equipment?

Resultant force

Calculating for single pairs of  forces

• Pointing the same direction add together
• Pointing in opposite directions subtract

What is the sum for the resultant force on this cart?

What is the calculation for the resultant force in this cyclist?

What calculation for the resultant force acting on the cup?

Write the calculation for resultant force on this cart.

Resultant force

Step 1 is to calculate the resultant force

Step 2 is to use the calculated value to decide what is happening to the object that the forces are acting on

Worked examples

• 750N - 500N = 250N to the right
• 400N - 400N = 0N stationary or constant speed
• 500N - 300N = 200N to the left OR
• 300N - 500N = -200N
• 500N - 500N = 0N stationary or constant speed
• 1000N - 500N = 500N to the right

What is the resultant force on the box?

What is the resultant force on the box?

What is the resultant force on the car?

What is the resultant force on the ball?

Calculate the resultant force.

Resultant force

More than one pair of forces.

Starting simple:

One pair is balanced (340N - 340N) so resultant force = 0N

2nd pair is unbalanced (550N - 230N) so resultant force = 320N upwards

Calculate the resultant force on the box

Calculate the resultant force on the box

Calculate the resultant force on the box.

Calculate

Calculate

Compare

Describe

Calculate

Calculate
and
Compare

Describe
and
explain

Congratulations. You just finished the resultant forces lesson!

🥳

Need help?

Video 

Watch these short videos explaining resultant forces:

https://www.youtube.com/watch?v=PL8ATKipoB4

https://www.youtube.com/watch?v=YGGxf6cp3Lo

Support

Go to a revision website to spend more time learning:

https://www.elevise.co.uk/g-a-cst-p5-home.html

https://senecalearning.com/en-GB/

What is the force that pulls objects towards each other?

1. Magnetism
2. Gravity
3. Tension
4. Friction

Who formulated the law of universal gravitation?

1. Galileo Galilei
2. Isaac Newton
3. Albert Einstein
4. Nikola Tesla

What happens to the force of gravity between two objects when the distance between them increases?

1. Disappears
2. Decreases
3. Remains constant
4. Increases

What is the formula for gravitational potential energy?

1. F=ma
2. P=IV
3. mgh
4. E=mc^2

In which direction does gravitational potential energy increase?

1. sideways
2. backward
3. downward
4. upward

What is the SI unit for gravitational potential energy?

1. volt
2. joule
3. ampere
4. watt

What is upthrust also known as?

1. Gravitational pull
2. Centripetal force
3. Frictional force
4. Buoyant force

What causes upthrust?

1. Expansion of solids
2. Displacement of fluid
3. Increase in temperature
4. Magnetic force

What effect does upthrust have on an object in a fluid?

1. It decreases the volume
2. It reduces the apparent weight
3. It changes the color
4. It increases the density