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level: Forces, acceleration and Newton's Laws

Questions and Answers List

level questions: Forces, acceleration and Newton's Laws

QuestionAnswer
What is terminal velocity?The maximum speed of an object reached when the forces moving the object are balanced by its frictional forces. The objects move at steady speed in a constant direction with a resultant force of 0.
What is inertia?The tendancy of an object to continue in its current state of motion(rest or uniform in motion)
What does it mean if the resultant force is 0?If resultant force is 0 then a stationary object remains stationary and a moving object remains moving. The forces are balanced
What is the required practical to investigate the effect of varying force on the acceleration of an object at a constant mass?1)Place an air track on a bench with a bench pulley at one end and two light gates above the track. Cut an interrupt card to a length (eg 10 cm) and attach it to an air track glider. 2)Connect the glider to a hanging mass by a string that is the length of the air track passing over the bench pulley. Make sure the air track is level & the card will pass through both gates before the mass strikes the floor. 3)Set the data logging software to calculate acceleration. 4)Add 5 × 20 g slotted masses (0.98 N of force) to the end of the string. 5)Release the glider, then record the weight and acceleration. 6)Repeat steps 4 and 5 two more times, and calculate a mean value for the acceleration. 7)Repeat steps 4 to 6, removing one of the slotted masses each time ,giving forces of 0.78 N, 0.59 N, 0.39 N and 0.20 N.
What 2 factors effect braking distance?1)Poor road and weather conditions 2)Poor vehicle condition, worn brakes/tires
How can you estimate the total stopping distance of a car using its speed?speed=20mp thinking distance=6m braking distance=6m total=12 AS SPEED DOUBLES, THINKING DISTANCE DOUBLES, BRAKING DISTANCE TIMES 4 SO: speed=40mp thinking distance=12m braking distance=24m total=36
What are the 3 stages of falling?1)Accelerating downwards due to gravity 2)Frictional forces such as air resistance increase 3)The object reaches terminal velocity, weight of object balanced due to frictional forces, resultant force is 0
What is Newtons first law of motion?An object remains in the same state of motion unless a resultant force is acting on it.
What is Newtons second law of motion?Force(N)=mass(Kg)aceleration(m/s)
Whats inertial mass?A mesure of how difficult it is to change the velocity of an object. Found using force over acceleration
What is Newtons third law?Whenever two objects ineract they exert equal and opposite forces.
What is stopping distance?stopping distance=thinking distance+braking distance
What 4 factors effect thinking distance?1)tiredness 2)drugs 3)alchahol 4)distractions