Oquizy

An astronaut with a mass of 70 kg is standing on a scale inside a spaceship. The spaceship is accelerating upwards from Earth with an acceleration of 2.5 m/s². If the gravitational field strength on Earth is 9.8 N/kg, what is the reading on the scale?

175 N 511 N 686 N 861 N

An object has a mass of 12 kg on Earth. If this object is transported to the Moon, where the gravitational field strength is approximately 1.6 N/kg, what is its weight?

12 N 120 N 19.2 N 7.5 N

An astronaut travels from Earth to the Moon. Which of the following statements correctly describes the change in the astronaut's mass and weight?

Both the astronaut's mass and weight decrease. Both the astronaut's mass and weight remain the same. The astronaut's mass decreases, but their weight remains the same. The astronaut's mass remains the same, but their weight decreases.

A skydiver of mass 75 kg first falls freely without a parachute, then opens the parachute. Before the parachute opens, the skydiver’s terminal velocity is 60 m/s. After the parachute opens, the new terminal velocity is reduced to 15 m/s. Which statement best explains this change?

The gravitational field strength decreases with height. The parachute increases air resistance, reducing the speed needed to balance weight. The skydiver’s mass decreases, reducing weight. The skydiver’s weight increases, so terminal velocity is lower.

A rocket is accelerating upwards away from Earth. According to Newton's Third Law, the force that propels the rocket forward is a reaction to which of the following?

The force of the rocket's engines pushing the exhaust gases downward. The force of the rocket's exhaust gases pushing on the atmosphere. The force of the rocket's nose cone pushing the air aside. The gravitational pull of the Earth on the rocket.

A 15 kg box is pushed across a horizontal floor with a constant acceleration of 2.0 m/s². If the force of friction acting on the box is 10 N, what is the magnitude of the force being applied to the box?

20 N 30 N 40 N 50 N

A skydiver falls through air and eventually reaches a constant velocity. This velocity is called:

Final velocity Impact velocity Maximum velocity Terminal velocity

A lift of mass 500 kg is being accelerated upwards at 2.0 m/s² by a cable. What is the tension in the cable? (Take g = 10 N/kg).

4000 N 5000 N 6000 N 7000 N

A car of mass 1200 kg is moving at 20 m/s when the driver applies the brakes, producing a constant retarding force of 6000 N. How long does it take for the car to come to rest?

2.0 s 3.0 s 4.0 s 5.0 s

F1 cars are designed with wide tyres and large spoilers (wings). How do these features improve the car’s ability to corner at high speeds?

They increase the downward force, allowing greater friction between tyres and track. They increase the velocity of the car without affecting friction. They reduce the mass of the car, lowering inertia. They reduce the weight of the car, requiring less centripetal force.

Quiz: Physics - Dynamics