Скачать или смотреть Calculating Static and Kinetic friction forces

Example:
The normal force exerted on a pram is 100 N. The pram’s brakes are locked so that the wheels cannot turn. The owner tries to push the pram but it doesn’t move. The owner pushes harder and harder until it suddenly starts to move when the applied force is three quarters of the normal force. After that the owner is able to keep it moving with a force that is half of the force at which it started moving. What is the magnitude of the applied force at which it starts moving and what are the coefficients of static and kinetic friction

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Thank you

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