what is the definition of centre of gravity?

The point at which the entire weight of an object can be considered to act

The gravitational force on a body

The centre of the gravitational field

Test

Mechanics

Lewisp 10 preguntas 3,0 (2 valoraciones)

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1what is a vector?
1. AA physical quantity that has both magnitude and direction.
2. BA physical quantity that only has magnitude.
2A force can be split into two components.
1. AVerdadero
2. BFalso
3what does the gradient on a displacement time graph show?
1. AVelocity
2. BAcceleration
4what are the conditions that the SUVAT equations can be used in?
1. Aconstant velocity
2. Bconstant acceleration
3. Cignore air resistance
4. DThe object is in freefall
5. EThe acceleration is positive
5what is the formula for work done?
1. Aw=fd
2. Bw=mgh
6The sum of forces and moments of an object in equilibrium equals...
1. A0
2. B10
3. C46
4. D94
7what is the definition of centre of gravity?
1. AThe gravitational force on a body
2. BThe point at which the entire weight of an object can be considered to act
3. CThe centre of the gravitational field
8pressure is the same as weight
1. AVerdadero
2. BFalso
9braking distance increases constantly
1. AVerdadero
2. BFalso
10power is ...
1. Athe rate of work done.
2. Bwork done x time