Forces and Motion Flashcards
A parachutist jumps from a plane. He has a weight of 600N and a mass of 60kg. Calculate the acceleration he experiences.
a = F/m a = 600/60 a = 10ms-2
What is the formula for speed?
Speed = Distance/Time
A trolley of mass 400g is accelerating at 0.5m/s^2. What force is needed to achieve this acceleration?
Force = Mass x Acceleration = 400 kg x 0.5m/s^2 = 200N
What are the 2 equations for acceleration?
a = v - u / t a = f/m = force (in N) / mass (in Kg)
A forward force produced by the engine of a car is 2500N. Calculate the acceleration. The mass of the car is 500 kg.
a=f/m =2500/500 =5 m/s^2
A cheetah accelerates from 10 m/s to 25 m/s in 3 seconds. Calculate its acceleration.
a=v-u/t =25-10/3 =5m/s^2
Calculate the weight of a 3500 kg jet.
W = mg W = 3500 x 10 = 35000 N
Calculate the mass of a bike that has a weight of 250 N.
m = W/g m = 250/10 m = 25kg
A car has a mass of 550 kg. Calculate its weight.
W = mg W = 550 x 10 = 5500 N
A man has a weight of 720 N. Calculate his mass.
m = W/g m = 720/10 m = 72kg
A car accelerates at 5 ms-2. It has a mass of 800kg. Calculate the size of the force producing the acceleration.
F = ma F = 800 x 5 F =4000N
A train decelerates at a rate of 1.5ms-2. The force applied by the brakes is 50000N. Calculate the mass of the train.
m = F/a m = 50000/1.5 m = 33333kg
What is Newton’s second law of motion.
F=ma
