Hệ số ma sát µ = 0,2; Khối lượng m = 4 kg;
Lực F = 12 N;
Góc  = 30 độ
Lấy g = 10 m/s2
Hợp lực tác dụng vào vật có độ lớn bằng bao nhiêu?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.