Forces and Motion Quiz

Prince and Emmitt are participating in a bicycle race. Prince covers a distance of 100 meters in 20 seconds. To find Prince's speed, use the formula (a)  

• Speed = Distance / Time

• Speed = Time / Distance

• Speed = Distance + Time

• Speed = Distance - Time

Answer explanation

The speed of an object is calculated using the formula: Speed = Distance ÷ Time. This means that to find speed, you divide the total distance traveled by the time taken, making 'Distance ÷ Time' the correct choice.

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Prince and Emmitt are pushing a box across the floor. They are experiencing (a)   as they push the box.

• Friction

• Gravity

• Inertia

• Momentum

Answer explanation

Friction is a contact force because it occurs when two surfaces interact directly. In contrast, gravity, magnetism, and electricity are non-contact forces that act at a distance without physical contact.

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Emmitt and Aaryn are playing with magnets. They notice that when they move the magnets further apart, the gravitational force between the magnets (a)   .

• increases

• decreases

• remains the same

• varies

Answer explanation

According to Newton's law of gravitation, the gravitational force decreases as the distance between two objects increases. This is because the force is inversely proportional to the square of the distance.

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Prince places a ball on the ground, and an unbalanced force acts on it. What will happen to the ball according to the laws of motion?

• It will remain at rest

• It will start moving

• It will disappear

• It will change color

Answer explanation

An unbalanced force acting on a ball at rest will cause it to start moving, as per Newton's first law of motion. The other options are incorrect because the ball cannot remain at rest, disappear, or change color without additional forces.

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Match the following scenarios with their corresponding speeds.

• A bike covers 100 meters in 5 seconds.

• 20 m/s

• Prince's car travels 100 meters in 20 seconds.

• 2 m/s

• A car travels 10 meters in 5 seconds.

• 5 m/s

• A snail moves 1 meter in 5 seconds.

• 0.2 m/s

Answer explanation

To find speed, use the formula: speed = distance/time. Here, distance = 100 meters and time = 20 seconds. Thus, speed = 100 m / 20 s = 5 m/s. Therefore, the correct answer is 5 m/s.

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Which of the following examples best illustrates a force that acts without direct contact?

• A magnet attracting a paperclip

• A person pushing a box

• A book resting on a table

• A car stopping at a red light

Answer explanation

A magnet attracting a paperclip demonstrates a force acting at a distance because the magnet exerts a magnetic force without direct contact, unlike the other scenarios which involve contact forces.

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Match the scenarios with the change in gravitational force between the toy cars.

• Prince places his car twice as far from Emmitt's car

• It becomes half as strong

• Prince places his car half as far from Emmitt's car

• It stays the same

• Prince places his car at a distance 1.5 times farther from Emmitt's car

• It becomes twice as strong

• Prince places his car at the same distance from Emmitt's car

• It becomes four times weaker

Answer explanation

According to Newton's law of universal gravitation, the force is inversely proportional to the square of the distance. If the distance doubles, the force becomes 1/(2^2) = 1/4, making it four times weaker.

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During a soccer game, Aaryn kicks the ball across the field. As the ball rolls on the ground, it gradually slows down and eventually stops. The force responsible for this change in motion is (a)   .

• Friction

• Gravity

• Inertia

• Momentum

Answer explanation

The soccer ball slows down and stops due to friction, which is the force that opposes the motion of the ball against the ground. Gravity acts downward but does not affect the horizontal motion in this case.

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A toy car's distance is measured every 2 seconds and plotted on a graph. The graph forms a straight line, indicating the car is (a)  

• moving at a constant speed

• accelerating

• decelerating

• stopped

Answer explanation

A straight line on the graph indicates that the distance traveled by the toy car is consistent over time, meaning it is moving at a constant speed. This rules out speeding up, slowing down, or not moving.

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When Prince rubs a balloon on his hair and it sticks to a wall, what type of force is causing this to happen?

• Electrical force

• Gravitational force

• Frictional force

• Magnetic force

Answer explanation

The balloon sticks to the wall due to an electrical force. Rubbing the balloon on hair transfers electrons, creating static electricity. This charge allows the balloon to attract to the neutral wall, demonstrating electrical attraction.

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