Practice Questions
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If a box weighing 50 kg is pushed across a wooden floor with a coefficient of static friction of 0.4, what is the maximum force that can be applied before the box starts to move?
The maximum static friction force is found by multiplying the coefficient (0.4) by the normal force. Other options are incorrect because Choosing 200 ...
If a car with a mass of 1,200 kg is moving on a road with a coefficient of kinetic friction of 0.6, what is the maximum deceleration the car can achieve before skidding?
The friction force that can be produced equals the coefficient times the car’s weight, giving a maximum braking force that lets the car slow down by a...
A skateboarder weighing 70 kg accelerates down a hill, reaching a speed of 10 m/s just before hitting the flat ground. If the coefficient of kinetic friction between the skateboard wheels and the ground is 0.3, calculate the distance over which the skateboarder will come to a stop after hitting the ground. (Assume no other forces are acting on the skateboarder besides friction.)
The friction force pulls back on the skateboarder and slows him at a constant rate of a = μg. Other options are incorrect because This option assumes ...
When you walk, which type of friction primarily helps you push off the ground without slipping?
Static friction is the force that stops your foot from sliding when you push. Other options are incorrect because Kinetic friction acts when an object...
If a rubber ball is dropped onto a concrete surface, which statement best describes the impact of friction between the rubber and concrete?
The coefficient of friction tells the ball how fast it loses energy when it hits the ground. Other options are incorrect because Many think friction i...
When an object is sliding down an inclined plane, the force that opposes its motion due to the interaction of the surfaces is known as ___.
Friction is a resisting force that works against motion. Other options are incorrect because Gravity pulls an object toward the Earth, but it does not...
If an object is sliding down an inclined plane and begins to slow down, what is the underlying cause of this deceleration?
Friction is the force that pushes against the motion of an object on a surface. Other options are incorrect because It is easy to think that gravity m...
If a block is sliding down an inclined plane, how does the frictional force behave compared to the gravitational force acting parallel to the incline?
Gravity pulls the block down the slope. Other options are incorrect because Some think friction helps a block speed up, but friction never adds to gra...
If you push a box across a floor and it doesn't move, what does this imply about the friction between the box and the floor?
When you push the box, the push is not strong enough to overcome the floor’s grip. Other options are incorrect because People sometimes think a statio...
Which of the following statements about friction are true? (Select all that apply)
Increasing the normal force pushes the surfaces together, so the friction force also grows. Other options are incorrect because The belief is that fri...
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