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What is the term used to describe both speed and direction of motion?
- Inertia
- Friction
- Momentum
- Velocity
Right Answer: (D) Velocity
What causes a meteor to heat up when it falls through the air?
- Its weight
- Friction with the air
- Its speed is too low
- Gravity is pulling it down
Right Answer: (B) Friction with the air
Which is an example of sliding friction?
- A person is dragging a box on the floor.
- A car’s wheels rolling on the road.
- A roller skating on a track.
- A ball moving on a smooth surface.
Right Answer: (A) A person is dragging a box on the floor
What happens to a moving object in space where there is no friction?
- It will keep moving forever.
- It will stop quickly.
- It will fall back to Earth.
- It will lose its shape.
Right Answer: (A) It will keep moving forever
Why do we need friction while walking?
- To slow us down.
- To give us grip so we don’t slip.
- To make the ground smoother.
- To make us lighter.
Right Answer: (B) To give us grip so we don’t slip
What is the correct formula for force?
- Force = mass × speed
- Force = mass × acceleration
- Force = speed × distance
- Force = energy × work
Right Answer: (B) Force = mass × acceleration
Which of the following is an example of potential energy?
- A moving car
- A running person
- Water stored in a dam
- A rolling ball
Right Answer: (C) Water stored in a dam
What is the efficiency of a machine that converts 70% of energy into useful work?
- 30%
- 70%
- 100%
- 50%
Right Answer: (B) 70%
What kind of energy does a moving object have?
- Potential energy
- Thermal energy
- Kinetic energy
- Electrical energy
Right Answer: (C) Kinetic energy
Which of the following is a practical example of a second-class lever?
- A crowbar.
- A wheelbarrow.
- A pair of scissors.
- A seesaw.
Right Answer: (B) A wheelbarrow.
