5. A force that acts along the two surfaces in contact and opposes the motion of one object over another is called the ____.
A. Gravitational force
B. Contact force
C. Frictional force
D. Pull force
Q2. Answer the following questions:
1. Define weight.
2. What happens when the bar magnet is moved closer to the iron nail? Give reason for your answer.
3. State the effect of force.
4. State one point of difference between electrostatic force and gravitational force.
Answer (2)
Weight is the force acting on an object due to gravity, defined by the equation W = m * g. A bar magnet induces magnetism in a nearby iron nail, causing attraction. The effects of force include changing motion, shape, and causing rotation, while electrostatic force can be attractive or repulsive, unlike gravitational force which is always attractive.
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The force that acts along the two surfaces in contact and opposes the motion of one object over another is called the frictional force . Therefore, the answer is C. Frictional force .
Q2. Answer following questions:
Define weight. Weight is the force exerted by gravity on an object. It is calculated as the product of the mass of the object and the acceleration due to gravity. The formula to calculate weight is: Weight = Mass × Acceleration due to gravity Weight is measured in newtons (N).
What happens when the bar magnet is moved closer to the iron nail? Give reason for your answer. When a bar magnet is moved closer to an iron nail, the iron nail will be attracted towards the magnet. This attraction occurs because the iron nail is ferromagnetic, meaning it can be magnetized or attracted to a magnet.
State the effect of force. The application of force can lead to several effects, including:
Changing the state of motion of an object, such as starting, stopping, or changing the direction of motion.
Altering the shape or size of an object, such as stretching, compressing, or bending.
State one point of difference between electrostatic force and gravitational force. One key difference is that electrostatic force can be attractive or repulsive, depending on the charges involved, whereas gravitational force is always attractive, acting between masses.
