Different Forces
True or False: A force is a push?
False: A Force is a push or a pull.
A force can change the shape of an object, its speed or the direction it is moving in.
Name a use for a spring?
Pogo stick
Bike suspension
Pens
True or False: Friction is a non-contact force.
False: Friction is a contact force.
True or False: Pressure is the amount of force pushing on a certain area?
True
True or False: Forces can be added together?
True: Forces can be added together.
It is easier for two people to push a broken down car than one. The force they each apply has been added together.
Name three contact forces?
Bonus points if you can name all four!
A contact force needs to touch the object to have an effect on it.
Contact forces include:
Friction, Air resistance, Water resistance and Upthrust.
What does elastic mean?
Elastic means the object returns to its original length when the force is removed.
Define Friction?
Friction is the force between two touching objects. It can slow things down or make things stay still.
What is the formula used to calculate Pressure?
Pressure = Force/Area
Complete the sentence:
If two forces are the same size and acting in opposite directions, _________ will happen. The forces are __________.
Nothing
Balanced
Name three non-contact forces?
A non-contact force can affect an object from a distance.
Gravity, Static Electricity and Magnetism are all non-contact forces.
What does the extension of a spring mean?
The extension of a spring is the difference between its original length and its stretched length.
Give a use for friction?
Bike tyres
Shoes soles
Car brakes
Finish this sentence:
For the same size force, increasing the area will __________ the pressure
Decrease or Lower
True or False: If unbalanced forces act on an object it will remain still?
False: If unbalanced forces are acting on an object the objects speed will change, it will start moving.
True or False: I have the same weight on Earth and the moon?
False: My mass is the same on Earth and the Moon. My weight is different as weight depends on gravity.
Whose law states that the extension of a spring is proportional to the force applied to it?
Hookes Law
How can we reduce friction?
We can reduce the friction between two objects by making the surfaces smoother or by using a lubricant.
What is the unit of pressure?
Pressure is measured in Newtons per square metre (N/m2) which is sometimes called a Pascal (Pa)
True or False: Balanced forces only act on stationary (still) objects.
False: Balanced forces can also act on moving objects. If the forces are balanced the object will move at a constant speed.
What are the units of weight?
Newtons
Weight is a force so its units are Newtons.
What type of materials do not return to their original shape when a force is removed?
Plastic materials
True or False: Air resistance and water resistance are a type of Friction?
True: Air resistance is friction between an object and gas particles in the air and water resistanceis the friction between an object and water particles.
Calculate the pressure when a force of 350N is applied to an area of 0.5 metres squared?
Pressure = Force/Area
Pressure = 350N/0.5 M2
Pressure = 700 N/M2 or 700 Pa
Why don't you fall through a chair when you sit on it?
The force of you sitting on the chair is balanced by an equal force from the chair pushing up against you.