Mechanics - Laws of Motion - SS2 Physics Past Questions and Answers - page 2

According to Newton's Second Law (F = ma), the acceleration of an object is given by a = F/m. Plugging in the values, we get a = 20 N / 5 kg = 4 m/s2.

Using Newton's Second Law (F = ma), we rearrange the equation to solve for acceleration: a = F/m. Plugging in the values, we get a = 10 N / 2 kg = 5 m/s2.

We can use Newton's Second Law (F = ma) to find the force. The acceleration is given by a = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is the time. Plugging in the values, we get a = (20 m/s - 0 m/s) / 10 s = 2 m/s2. Then, F = ma = 1000 kg x 2 m/s2 = 2000 N.

Using Newton's Second Law (F = ma), we rearrange the equation to solve for acceleration: a = F/m. Plugging in the values, we get a = 50 N / 10 kg = 5 m/s2.

When the ball reaches its highest point, its velocity becomes 0 m/s. Using the equation v2 = u2 + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration (in this case, -g), and s is the displacement, we can solve for the displacement. Plugging in the values, we get 02 = 202 + 2(-10)s. Solving for s, we get s = 100 m.

Explanation: The force of friction is influenced by the area of contact between the surfaces and the coefficient of friction, which is a property of the materials in contact.

Explanation: The coefficient of friction (μ) is defined as the ratio of the frictional force (F) to the weight of the object (W). μ = F/W.

Explanation: Static friction is generally larger than kinetic friction. It is the force that opposes the motion of an object at rest, and it must be overcome to set an object in motion.

Explanation: The coefficient of static friction (μs) is generally greater than the coefficient of kinetic friction (μk) for a given pair of surfaces. The static friction is higher because it needs to be overcome to initiate motion.

Explanation: The force of friction is directly proportional to the normal force between the surfaces. The normal force is the force exerted perpendicular to the surfaces in contact.