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Forces in motion

3. practise question

4. practise question

2. mass and weight

2. Forces and equillibrium

1. Forces and acceleration

Resultant force is the vector sum of all the forces
A newton is the force required to accelerate a mass of 1kg by 1ms-2 in the direction of the force
force equals mass times acceleration.

Forces and acceleration

Mass of an object is the amount of matter in it . Weight is a force and is measured in Newtons.

Mass weight and centre of mass

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f=mam=750kgt=30su=0ms-1a=f over m. 1.5e3 /750= 2ms-2s=ut+1/2ate2s=0(30)+(1/2 *2 *30e2) = 900.

A spacecraft is at rest in deep space and has a mass of 750 kg . The spacecraft fires its thrusters for 30 seconds producing a constant force of 1.5e3. Calculate the distance travelled in 30 seconds

Fnetx = wx +friction(mg*siin(tita) +0.3=(-0.1*9.81*sin(30)+0.3=-0.1905netx = 0.19N
A smart phone of mass 100 grms slides down an inlcined table. The table is at an angle of 30 degrees from the horizontal . The phone experiences a constant friction of 0.3N. Calculate the magnitude of the net force on the phonein the plane parrallel to the tble. Give you answer to 2 sig figs