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15
×
A boat floats because its weight and the upthrust from water are balanced.
False
True
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15
×
Streamlining involves changing the shape of an object to make the force of friction as small as possible.
False
True
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banana
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seesaw
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gift
Win 15 points!
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thief
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25
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lifesaver
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gold
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rocket
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banana
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15
×
Forces are pushes or pulls. Forces can:
All of these
â change the shape of an object
â change the speed things are moving (make them move faster or slower)
â change the direction of a moving object.
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15
×
Friction is a contact force. Friction can
Slow objects down
Cool objects down
Cause arguments
Make objects move faster
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15
×
Which of the following examples would you not want increased friction ?
Scubadiving
Ice Skating
Car racing
Skydiving
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15
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Non-contact forces can have an effect without objects touching. Which example is NOT a non-contact force?
Magnetic force
Weight (gravity force)
Air resistance
Static electric force.
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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
×
The unit for measuring force is the newton (N).
False
True
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thief
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25
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rocket
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fairy
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banana
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15
×
If there are unbalanced forces on an object:
A moving object continues to move at the same speed
A stationary object will start to move
A stationary object stays stationary
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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
5N
50N
10N
100N
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15
×
Contact forcesonly act when two objects or materials are touching. An example of a contact force is:
Magnetic force
Static electric force.
Friction
Weight (gravity force)
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15
×
Gravitational field strength is the size of the gravity on every kilogram of mass.This is different on every planet.
False
True
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monster
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fairy
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gift
Win 25 points!
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lifesaver
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