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You are driving in your car with a sack of groceries in the seat next to you. You see a light change and you slow down and the sack remains on the seat. Suddenly the car in front of you slams on the brakes, and you are forced to brake harder. The groceries slide off the seat. Explain what happened.
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At the lower deceleration the frictional force required to decelerate the sack of groceries was below the maximum static friction between the sack and the seat,but at the higher deceleration the frictional force was not sufficient,so the sack slid.
State the condition for an object to be in translational equilibrium.
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The net force acting on the object must be zero.
Is it possible for an object moving with a constant speed to accelerate?
Explain.
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Yes,although the speed is constant,the direction of the velocity can be changing.
An airplane is flying with constant speed along a horizontal circle. Is the direction of its acceleration constant?
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You are driving your car and set your sunglasses on the dashboard. When you make a left turn, the sunglasses go sliding off to the right. Explain.
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The force of kinetic friction between two surfaces is dependent on the relative speed of the two surfaces.
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The force of kinetic friction between two surfaces is independent of the area of contact between the surfaces.
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The coefficient of static friction is always larger than the coefficient of kinetic friction.
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The force of static friction between two surfaces is independent of the area of contact between the surfaces.
True False
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The force fo static friction between two surfaces is parallel to the surface of contact, and in in the direction that opposes relative motion.
True False
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An ideal pulley changes the direction of the tension in a string without changing its magnitude.
True False
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When an object is in translational equilibrium, the net force acting on the object is non-zero.
True False
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For uniform circular motion, the velocity and acceleration vectors are perpendicular to each other at every point in the path.
True False
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A net horizontal force is required for a body to move in a horizontal circle.
True False
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The banking angle for a properly banked curve does not depend on the mass of the car going over it.
True False
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When a curve is properly banked a passenger in a car traveling on it at the designed speed does not feel a lateral force.
True False
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An object moving along a curved path with constant speed does not have a net force acting on it.
True False
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