tinh do lon cua cac luc va bieu dien cac luc vecto tac dung len 1 vat dang nam can bang treo duoi 1 soi day biet vat co the tich 50m3 vs co khoi luong rieng la 10*10*10*10kg/m3 ti xich 1 cm=2,5n

thong tin duoc bieu dien duoi dang day cac

bằng cac du kien thoi gian cho san duoi day em hay dien tiep các su kien de lam ro cach mang ha lan dien ra nhu the nao

thanh sat va thanh nam cham duoc treo bang day tren cac gia do khi dat gan nhau chung hut nhau . cac luc tac dung len thanh sat duoc bieu dien nhu hinh tren . em hay cho biet co nhung luuc nao tac dung len vat va mo ta cac yeu to cua cac luc nay

hay dien cac nguyen thich hop vao cac o trong trong bang duoi day sao cho 3 so o 3 o lien nhau =102

1 o to co khoi luong 1 tan chuyen dong thang deu vou luc keo la 5000N

a) hay xac dinh do lon cua luc ma sat.

b) ke ten cac luc tac dung len o to va bieu dien cac luc theo ty le xich 1 cm ung voi 5000N.

Can gap

bieu dien luc : cho qua bong co khoi luong 0,25 kg .Treo len 1 soi dau gia co ding

a, co nhung luc naotac dung len qua dung

b, bieu dien cac luc nay theo ti xich 1 cm ung 1 N

2. Hay neu cac cach lam giam hao phi tren duong day tai dien

doc thong tin trong khung duoi day chi ra nhung diem giong hoac khac

luc ma sat co the co ich co the co hai . co 1 so bien phap lam giam ma sat co hai

chuyen ma sat truot thanh ma sat lan

su dung cac chat boi tron nhu dau mo hay bot than chi o giua cac be mat tiep xuc cua 2 vat ran