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15
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Which of the following examples would you not want increased friction ?
Scubadiving
Ice Skating
Skydiving
Car racing
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15
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The weight of an object can be calculated using the formula: W=mg What is the Weight of a 10kg bowling ball on Earth
50N
10N
5N
100N
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15
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Friction can be increased by using rough surfaces, or by using materials such as rubber that have a lot of friction.
True
False
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15
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A force can be measured with a force meter.
False
True
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15
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Streamlining involves changing the shape of an object to make the force of friction as small as possible.
True
False
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baam
Lose 15 points!
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fairy
Take points!
5
10
15
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25
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gift
Win 10 points!
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lifesaver
Give 20 points!
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15
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Balanced forcesare forces on an object that are the same size but work in opposite directions. If forces are balanced:
Astationary object will start to move
A moving object will change its speed or direction.
A stationary object stays stationary
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15
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If there are unbalanced forces on an object:
A stationary object stays stationary
A stationary object will start to move
A moving object continues to move at the same speed
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15
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The force of friction produced by the air is known as ...?
Air resistance
Resistance is futile
Oxygen friction
Water resistance
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heart
Other team wins 20 points!
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star
Double points!
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fairy
Take points!
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25
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banana
Go to last place!
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seesaw
Swap points!
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shark
Other team loses 20 points!
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fairy
Take points!
5
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25
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thief
Give points!
5
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20
25
15
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Friction can be reduced by using smooth surfaces, or by lubrication. Which material could help reduce friction?
Sand
Oil or Grease
Glue
Rubber
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15
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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.
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15
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Mass is a measure of how much matter an object is made of.The unit of mass is the kilogram (kg).
True
False
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15
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Forces are pushes or pulls. Forces can:
All of these
â change the direction of a moving object.
â change the shape of an object
â change the speed things are moving (make them move faster or slower)
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15
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Gravitational field strength is the size of the gravity on every kilogram of mass.This is different on every planet.
True
False
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