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A boat floats because its weight and the upthrust from water are balanced.
 
True
 
False
If there are unbalanced forces on an object:
 
A stationary object will start to move
 
A stationary object stays stationary
 
A moving object continues to move at the same speed
Balanced forcesare forces on an object that are the same size but work in opposite directions. If forces are balanced:
 
A stationary object stays stationary
 
Astationary object will start to move
 
A moving object will change its speed or direction.
The weight of an object can be calculated using the formula: W=mg What is the Weight of a 10kg bowling ball on Earth
 
100N
 
10N
 
5N
 
50N
The gravitational field strength on Earth is 10 N/kg
 
True
 
False
Gravitational field strength is the size of the gravity on every kilogram of mass.This is different on every planet.
 
True
 
False
Weight is the size of the force of gravity on an object.The unit of weight is the newton (N)
 
True
 
False
Mass is a measure of how much matter an object is made of.The unit of mass is the kilogram (kg).
 
True
 
False
Streamlining involves changing the shape of an object to make the force of friction as small as possible.
 
True
 
False
Which of the following examples would you not want increased friction ?
 
Car racing
 
Skydiving
 
Scubadiving
 
Ice Skating
The force of friction produced by the air is known as ...?
 
Air resistance
 
Water resistance
 
Resistance is futile
 
Oxygen friction
Friction can be reduced by using smooth surfaces, or by lubrication. Which material could help reduce friction?
 
Oil or Grease
 
Rubber
 
Glue
 
Sand
Friction can be increased by using rough surfaces, or by using materials such as rubber that have a lot of friction.
 
True
 
False
Friction is a contact force. Friction can
 
Slow objects down
 
Make objects move faster
 
Cause arguments
 
Cool objects down
A force can be measured with a force meter.
 
True
 
False
Non-contact forces can have an effect without objects touching. Which example is NOT a non-contact force?
 
Air resistance
 
Magnetic force
 
Static electric force.
 
Weight (gravity force)
Contact forcesonly act when two objects or materials are touching. An example of a contact force is:
 
Friction
 
Weight (gravity force)
 
Static electric force.
 
Magnetic force
Friction is a force caused by two things rubbing together. What example is NOT an example of Friction?
 
An image reflected on a mirror
 
<b>Air resistance</b>
 
A hummingbird hovering mid flight
 
<b>water resistance</b>
The unit for measuring force is the newton (N).
 
True
 
False
Forces are pushes or pulls. Forces can:
 
All of these
 
â—Ź change the shape of an object
 
â—Ź change the speed things are moving (make them move faster or slower)
 
â—Ź change the direction of a moving object.
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