Physics Practice Questions on Friction and Forces

Measuring Atmospheric Air Mass

• Mass of atmospheric air was measured in different volumes, with an error of 0.3 m³ for volume and 0.5 kg for mass.
• A graph shows the results of these measurements.

Day and Night on Earth

• The change of day and night on Earth is explained by the Sun's rising and setting.
• This phenomenon is related to the Sun-centered system.

Pendulum Clock

• The graph shows the change in speed of a pendulum clock over time.
• The amplitude of the pendulum's speed is 0.2 m/s.

Boy on a Swing

• The graph shows the change in the boy's coordinate over time.
• The frequency of the boy's oscillations is 0.5 Hz.

Hooke's Law

• The experiment tested the assumption that the force of elasticity is directly proportional to the deformation of a body.
• The graph shows the change in Fynp with respect to A1 for two bodies.
• The assumption is confirmed for both bodies.

Hanging Weight

• A weight suspended from a thread oscillates from position 2 to position 1.
• If air resistance is neglected, the mechanical energy of the weight remains constant.
• The kinetic energy of the weight increases, while the potential energy remains constant.

Braking Bicyclist

• A bicyclist brakes and loses 500 J of kinetic energy in the first few seconds.
• The internal energy of the bicyclist and the surrounding environment decreases by 500 J.

Tension Force

• A dynamometer is pulled to the right with a attached block sliding on the table at a constant speed.
• The force of friction acting on the block is 1.88 ± 0.05 N, directed to the right.

Friction Force on a Block

• A block of mass 0.2 kg slides down an inclined plane and increases its speed by 1.2 m/s in 3 seconds.
• The resultant force of the Earth and the plane on the block is 0.144 N.

Gravitational Force

• An apple hanging from a branch is attracted to the Earth with a force of 3 N.
• The apple attracts the Earth with the same force of 3 N.