Forces, Acceleration, and Energy (HSC SSCE Physics): Quizzes

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Newton's Laws and Friction
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A book sliding across a table slows down. What is the direction of its acceleration?

Backwards (opposite to motion)

According to Newton's second law, acceleration is inversely proportional to what?

Mass

What is the microscopic origin of friction between surfaces?

Electrostatic interactions

How does static friction behave as you gradually increase the applied force?

It adjusts to match applied force

What is the formula for maximum static friction force?

Fmax=μsFNF_{\text{max}} = \mu_s F_N

Which statement about kinetic friction is correct?

It has a constant value during sliding

What is the relationship between μs\mu_s and μk\mu_k for any pair of surfaces?

μs>μk\mu_s > \mu_k always

How does lubrication affect friction between steel surfaces?

Significantly reduces friction

What force provides the forward acceleration when a car accelerates?

Static friction between tyres & road

How does air resistance depend on speed?

Proportional to v2v^2

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Forces, Acceleration, and Energy

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Forces, Acceleration, and Energy

Momentum, Energy, and Simple Systems

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