alleryThe impulse of a force has the same dimensions as:
- linear momentum
- pressure
- energy
- power
Show answer and solution
Correct answer: A. linear momentum
Impulse = F·Δt = Δp, so it carries the dimensions of momentum, [M L T⁻¹].
AP Intermediate 1st Year Unit 2B: Friction, Gravitational and Normal Forces — practice questions
Explore 13 free Unit 2B: Friction, Gravitational and Normal Forces questions in AP Intermediate 1st Year Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–13 of 13.
The impulse of a force has the same dimensions as:Read the answer and worked solution →The action and reaction forces of Newton's third law:Read the answer and worked solution →For a given pair of surfaces, the coefficient of kinetic friction is usually:Read the answer and worked solution →A constant force of 20 N acts on a 5 kg body initially at rest. Its speed after 3 s is:Read the answer and worked solution →A 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed. The magnitude of the impulse on the ball is:Read the answer and worked solution →A 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The average resistive force is:Read the answer and worked solution →A block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static friction between block and incline is:Read the answer and worked solution →A 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of the gun is:Read the answer and worked solution →A 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g = 10 m s⁻²). The scale reads:Read the answer and worked solution →A 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tension in the string is:Read the answer and worked solution →The maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs = 0.6, g = 10 m s⁻²):Read the answer and worked solution →For a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tension in the connecting string is:Read the answer and worked solution →A net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4 s is:Read the answer and worked solution →
Worked practice questions
The action and reaction forces of Newton's third law:
- act in the same direction
- are unequal in magnitude
- act on the same body
- act on two different bodies
Show answer and solution
Correct answer: D. act on two different bodies
Action and reaction are equal and opposite but act on two different bodies, so they never cancel on a single body.
For a given pair of surfaces, the coefficient of kinetic friction is usually:
- less than the coefficient of static friction
- greater than the coefficient of static friction
- exactly zero
- equal to the coefficient of static friction
Show answer and solution
Correct answer: A. less than the coefficient of static friction
Once relative motion starts, friction falls below its static maximum, so μk < μs for the same surfaces.
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