Force and Its Effects - UNSOLVED PRACTICE SET
Chapter: Force and Laws of Motion | Topic: Force and Its Effects
FORCE AND ITS EFFECTS - UNSOLVED PRACTICE SET
Topic: Force and Its Effects
Multiple Choice Questions
Q1. Which of the following is NOT a possible effect of force?
- Change in speed of an object
- Change in direction of motion
- Change in colour of an object
- Change in shape of an object
Q2. When you squeeze a lump of wet clay between your palms, it changes shape. This is an example of force causing:
- Change in state of motion
- Change in colour
- Change in shape
- Change in mass
Q3. A football rolling on grass gradually slows down. The force responsible for stopping it is:
- Gravitational force
- Magnetic force
- Friction force
- Muscular force
Q4. Which of the following is a non-contact force?
- Friction
- Muscular force
- Gravitational force
- Normal reaction
Q5. A spring balance stretches when a weight is hung from it. The effect of force being shown here is:
- Change in state of motion only
- Change in shape only
- Change in both motion and shape
- No change at all
Q6. The SI unit of force is:
- Joule
- Watt
- Newton
- Pascal
Short Answer Questions
Q7. Define force. State why it is considered a vector quantity and give one supporting example.
Q8. List four effects that a force can produce on an object. Give a distinct real-life example for each.
Q9. Distinguish between contact forces and non-contact forces. Give two examples of each type.
Q10. Rohan kicks a football towards the goal. Identify
(a) the type of force applied,
(b) the effect on the ball's speed, and
(c) the effect on its direction of motion.
Q11. What is a resultant force? Two forces of 6 N and 4 N act in the same direction on an object. What is the resultant force? What if they act in opposite directions?
Q12. Explain with two different examples how the same object can experience force effects that change both its shape and its motion at the same time.
Long Answer Questions
Q13. Describe all the effects a force can have on an object. For each effect, give a real-life Indian example (from sports, transport, kitchen, or nature). Then explain: why is force a vector quantity, and what does the direction of force determine about the resulting motion?
Q14. (a) Explain the difference between muscular force and mechanical force with examples.
(b) Describe two everyday situations where non-contact forces are at work.
(c) Is gravitational force a contact or non-contact force? Justify with evidence.
(d) Can two forces balance each other if they are of different types (e.g., friction and applied force)?
Explain.
Q15. Imagine a potter in Rajasthan shaping a pot on a spinning wheel.
(a) Identify all forces acting on the clay.
(b) What effects are being produced by the potter's hands?
(c) What type of forces are these?
(d) How does the force of gravity affect the pot as it is shaped?
(e) What would happen to the clay if the potter applied force unevenly from both sides?
Numerical / Application-Based Problems
Q16. Two boys push a heavy crate on a smooth floor. Boy A pushes East with 90 N, Boy B pushes West with 55 N. (a) Find the net force and direction.
(b) If the crate has a mass of 35 kg, calculate its acceleration using F = ma.
(c) What must Boy B's force be to keep the crate in equilibrium?
Q17. A spring of natural length 15 cm stretches to 23 cm when a force of 8 N is applied.
(a) Find the extension.
(b) Calculate the spring constant k using F = kx.
(c) How much will the spring stretch if a force of 12 N is applied (assuming Hooke's Law still holds)?
Q18. A rubber ball of mass 0.1 kg falls from rest and hits the floor. It rebounds upward. Just before hitting the floor its speed is 6 m/s (downward), and just after rebounding its speed is 4 m/s (upward).
(a) Calculate the momentum just before impact (take downward = positive).
(b) Calculate the momentum just after rebound.
(c) Calculate the change in momentum of the ball.
(d) What two forces caused these changes?