Grade 10 Physics Extra Practice Booklet Term 3 Finals Which safety device in a c

Question

Grade 10 Physics Extra Practice Booklet Term 3 Finals Which safety device in a car will prevent your body from maintaining its inertial speed if the car suddenly comes to a stop (select one correct answer) Mp3 player Seat belt Roof Concept Apply Newton's second law of motion "F = ma" Which equation is given by Newton's second law? A football of mass 5 kg is hit with a force F. If the ball accelerates at 0.5 ms^-2 then what force was the ball hit with? A force of 5000 N s applied to a body causing an acceleration of 4 ms^-2. What is the mass of the body? A small child of mass 20 kg is in a car when it suddenly accelerates. If the child feels a force of 10N then what is the acceleration of the car? A small child of mass 18 kg is in a car when it suddenly accelerates. If the child feels a force of 90 N then what is the acceleration of the car? A car of mass 1500 kg traveling at an initial velocity of 10 ms^-1 comes to a stop in a time of 20 s Calculate the magnitude of the force applied by the brakes.

Explanation / Answer

36) b

37) F=ma

where, F is applied force

m is mass, a is acceleration

38) F = ma = 5x0.5 = 2.5 N

39)F=ma

m = F/a = 5000/4 = 1250kg

40)F= ma

a=F/m = 10/20 = 0.5 m/s2

41)

F= ma

a=F/m = 90/18 = 5 m/s2

42)acceleration = change in velocity/time taken = 10/20 = 0.5 m/s2

mass = 1500kg

Force = ma = 1500x0.5 = 750 N

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