First Test S1 Flashcards
What 3 things can forces change?
Shape
Direction
Speed
What are some examples of forces changing the speed of an object
Someone kicking a football
Throwing a paper airplane
Squeezing a tube of toothpaste
What are some examples of shape.
Juicing a lemon
Squeezing a ball
Moulding clay
What are some examples of direction
Turning the steering wheel of a car
Leaves blowing in the wind
A wind vein moving in the direction
What is another word for the newton balance
Spring balance
What is the formula to figure out the weight of something on earth?
W=MxG
How does a newton balance work
The spring will move a set distance depending on the amount of weight the object has.
How can you decrease friction
Having a smoother surface
What type of energy is produced when you rub your hands together
Heat energy
What will happen if an object is at rest and balanced
Remain still
If an object is already moving at a steady speed in a straight line and balanced forces act on it then it will
Move at a constant speed in a straight line
When measuring any physical quantity in physics we need?
A unit of measurement and apparatus to measure it
What features of shape affect the force of friction on the object?
Length
Width
What is the definition of mass
The total mass in any object measured in Kg the mass of an object never changes
What’s the definition of weight
Weight is a force and is the pull of gravity on a mass measured in (N) (newtons)
What is the definition of a gravitational field
The region of space surrounding a body in which another body experiences a force of gravitational attraction Unit is (N/Kg)
Why does a seatbelt stop you from flying out the car
Unbalanced braking force slow car and man together as seatbelt attaches
Man to car
What would happen in a car crash if you weren’t wearing a seatbelt
You would be travelling at the same speed as the car and go out through the windshield at the same speed that the car was going in a straight line
What are some differences between weight and mass
Weight Measured in newtons Changes throughout universe Depends in gravitational field strength Measured by newton balance
Mass Measured in kg Stays constant doesn’t change Amount of matter Measured by electronic scale
How would you increase friction
Making a rough surface
