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Science forces test.

Sutdy 26 hours a day.

QuestionAnswer
Forces are? Pushes, pulls, or twists.
Forces can... Change the shape, size, speed, or moving direction of an object.
The unit for measuring forces is... Newton(N)
Friction is (and give examples) A force that acts against the direction of the motion of an object and is caused by two objects rubbing together. Examples of friction are air and water resistance.
Solid objects(such as chairs) apply what force on you when when you sit on them? Upthrust
Examples of contact forces? Friction, Air resistance, water resistance, upthrust
The non-contact forces? Gravity, Magnetism, Static electricity
Your Mass is? And measured in? The amount of substance in your body. Measured in Kilograms(KG)
Your weight is? And measured in? Weight is a force caused by gravity pulling on your body. It is measured in Newtons(N)
Will you have a different mass on the moon than you do on Earth? No, your mass will remain the same as wherever you go, the amount of substance in your body remains. However, your weight will change as the moon has less gravity than Earth and therefore will affect your weight.
What is Hooke's law? Hooke's law states that the extension of a spring is proportionate to the force on it.
What happens if the force on a stretched elastic material is removed? The elastic material returns to it's original extension.
What happens when an object goes beyond it's elastic limit? The object will no longer return to it's original length when the force is removed.
What is special about certain materials and materials made of plastic such as 'Plasticine'? They will stretch with a force, but won't return to their original length once the force on them is removed.
Friction can- Slow objects down, produce heat, wear things away and cause a noise.
True or false- rough objects increase friction. True
Other than smooth surfaces, what can decrease friction between two objects? Lubrication
Examples of lubricators. Oil and Grease.
What is pressure? The amount of force pushing on a certain area.
Finish the sentence- For a certain force, the bigger the surface area the _____ the pressure smaller. Explanation: Basically, the same amount of force on an object of smaller area adds more pressure, while with larger area less pressure is put.
Formula of working out the pressure under an object: Pressure= Force ➗Area
Stacy is moving forward at a constant speed. Are the forces on her balanced or unbalanced? Balanced.
A stationary objects starts to move. Are the forces balanced or unbalanced? Unbalanced.
A moving objects changes direction. Are the forces balanced or unbalanced? Unbalanced.
True or false: Objects can be compressed(made shorter) or stretched(made longer). True
A spring with an elastic limit of 50N is stretches 2cm when a force of 10N is applied to it. How much will it stretch when a force of 20N is applied to it? 4cm
Is someone with more or less pressure under them more likely to sink in snow? Someone who has more pressure under them is more likely to sink in snow.
What unit is used to measure pressure? Pascals(Pa)
Created by: as11812
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