Forces Questions

Questions:

1. What is a Force?
2. Give 4 Examples of Forces
3. Units of Forces?
4. Equation of a Force?

Answers:

1. A force is basically a push or pull on an object that can either change its direction, speed or shape.
2. Here are a few examples of forces:
   • Friction is an example of a force and happens 2 surfaces are rubbed together causing the object to slow down and producing heat e.g. a car moving on the street creating friction between the tires and the street.
   • Air Resistance is a force that happens between a moving object and air pushing it in a speed and direction dependent on the wind direction and speed e.g. A fast cyclist cycling against the wind.
   • Gravity is a very common example of a force and is an attractive force between objects and the earth and causes an object to be pushed down on the earth depending on its mass; the bigger the object, more the mass of the object and the more the gravity e.g. an apple falling from a tree to the ground.
   • A magnetic field is a force that occurs between a two magnets or a magnet and a magnetic metal (Iron), it causes the magnets to either attract or repel depending on how the magnet's domains are lined up e.g. two magnets beside each other with the same south pole; they will repel.
3. Forces are measured in Newtons
4. Forces Equation:

F=Mass x Acceleration

E.G.

F= 50 KG x 10m/s^2

=9.8 m/s^2