Forces Flashcards
What is a force?
Push/pull/twist that cannot be seen, but can see the effect on an object.
What are the 4 effects of a force?
- Change the position
- Change the direction/speed
- Change the shape (deform)
- Cause rotation
What are the two types of forces? Explain each.
- Contact forces - forces that occur when 2 objects are touching
- Non-contact forces - forces that occur even though objects are separated by distances.
Name 7 contact forces.
- Air resistance
- Friction
- Tension
- Reaction
- Applied force
- Spring force
- Normal force
Name 3 non-contact forces.
- Magnetic force
- Electrostatic force
- Gravitational force
What is the symbol for force?
F (NOT “f”)
What is the SI unit for force?
Newtons/N (NOT “n”)
Name 2 things to measure the magnitude of relatively small forces.
Spring balance
Newton meter
What is magnitude?
Size.
What are Newton’s 3 laws of motion?
LAW 1: An object will remain still/keep travelling at a constant velocity when all the forces acting on it are balanced (equal/cancel out).
LAW 2: An object will accelerate in the direction of the resultant force when all the forces acting on the object are unbalanced.
LAW 3: When 2 objects interact, the forces they exert on each other are equal in size and opposite in direction.
What is a vector?
A. Despicable Me Movie character
B. Quantity that has a magnitude
C. Quantity that has a magnitude and direction
D. Quantity that has a direction
C.
What is a scalar?
A. A word
B. Quantity that has a magnitude
C. Quantity that has a magnitude and direction
D. Quantity that has a direction
B.
What are balanced forces?
Forces that are the same size, but in opposite directions.
What are unbalanced forces?
Forces that are not equal and opposite, which results in a change in speed/direction.
What is equilibrium?
When the resultant force equals zero.
What is a force diagram?
Displays all the forces acting on an object as arrows, pointing in the direction of the effect. This can be simplified by using the object’s centre of gravity.