Physics 10

What is an asteroid?

• a small piece of rock

• a UFO

• an earth satellite

• a star

An astronaut has a mass of 100 kg.

       Weight is calculated using the equation:

       weight (N) = mass (kg) × gravitational field strength (N/kg)

       On Earth the gravitational field strength is 10 N/kg.

What is the weight of the astronaut on Earth?

• 100 N

• 1000 N

• 500 N

• 250 N

How the weight of the astronaut changes as she travels away from Earth?

• Weight increases, gravitational field strength increases

• weight decreases, gravitational field strength decreases

• weight decreases, gravitational field strength increases

• weight increases, gravitational field strength decreases

The gravitational field strength is less on the Moon than on the Earth. Why this means that the astronaut can jump higher on the Moon than he can when she is on the Earth?

• He can exert the same force, but his weight is less.

  So there is a greater resultant force upward.

• He can exert the same force, but his weight is greater. So there is lesser resultant force upward.

• He can exert less force, but his weight is lesser. So there is greater resultant force downward.

• He can exert less force, but his weight is lesser. So there is greater resultant force downward.

What is the instrument used to measure weight?

• force meter

• barometer

• thermometer

• Verner caliper

What are the two factors that affect the weight of an object?

• mass and gravitational field strength

• distance and time

• force and magnetude

• mass and weight

The figure shows force arrows on a box. In which direction is the resultant force?

• Up

• down

• left

• the box will not move

The diagram showed the set up for the investigation of the effect of changing the angle of a slope on the acceleration of the trolley. What are the factors (control variables) that are kept the same on this investigation?

• mass of trolley and surface of slope

• gravity and acceleration

• force and gravity

• mass and weight

What is measured by the data logger in trolley acceleration practical?

• the speed of the trolley at both light gates, and the time taken for the trolley to move between the two gates

• the acceleration and distance taken by the trolley

• the mass and weight of the trolley

• force and gravity of the trolley

Why a piece of card is attached to the trolley on this practical?

• blocks out the light for a set distance

• to record the time

• to record the speed

• to record the acceleration