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Forces are pushes or pulls. Forces can:
● change the speed things are moving (make them move faster or slower)
● change the direction of a moving object.
All of these
● change the shape of an object
The unit for measuring force is the newton (N).
True
False
Friction is a force caused by two things rubbing together. What example is NOT an example of Friction?
<b>Air resistance</b>
A hummingbird hovering mid flight
An image reflected on a mirror
<b>water resistance</b>
Contact forcesonly act when two objects or materials are touching. An example of a contact force is:
Magnetic force
Weight (gravity force)
Friction
Static electric force.
Non-contact forces can have an effect without objects touching. Which example is NOT a non-contact force?
Static electric force.
Magnetic force
Air resistance
Weight (gravity force)
A force can be measured with a force meter.
True
False
Friction is a contact force. Friction can
Cause arguments
Cool objects down
Make objects move faster
Slow objects down
Friction can be increased by using rough surfaces, or by using materials such as rubber that have a lot of friction.
True
False
Friction can be reduced by using smooth surfaces, or by lubrication. Which material could help reduce friction?
Oil or Grease
Glue
Rubber
Sand
The force of friction produced by the air is known as ...?
Air resistance
Resistance is futile
Water resistance
Oxygen friction
Which of the following examples would you not want increased friction ?
Car racing
Scubadiving
Skydiving
Ice Skating
Streamlining involves changing the shape of an object to make the force of friction as small as possible.
False
True
Mass is a measure of how much matter an object is made of.The unit of mass is the kilogram (kg).
True
False
Weight is the size of the force of gravity on an object.The unit of weight is the newton (N)
True
False
Gravitational field strength is the size of the gravity on every kilogram of mass.This is different on every planet.
False
True
The gravitational field strength on Earth is 10 N/kg
True
False
