Mechanics

The diagram represents the moon in its orbit around the sun.

Which arrows represent the direction of resultant force acting on the moon at the instant shown.

• A

• B

• C

• D

A car moves in a circle at a constant speed. What is the direction of the resultant force acting on the car?

• A

• B

• C

• D

In the given figure, two blocks of masses m₁ and m₂ are attached with an inextensible string such that the pulley and the horizontal surface are frictionless.

• equal to tension at point B.

• zero.

• less than tension at point B.

• greater than tension at point B.

An astronaut lands on an alien planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 80 kg. Her mass on the planet is

• 80 kg

• 76.5 kg

• 90 kh

• 0

When a force acts on a body, it produces an acceleration in the body and will be equal to the rate of change of

• velocity of the body

• displacement of the body

• inertia of the body

• momentum of the body

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 6 N*s

• 33.3 N*s

• 1 N*s

• 6 N

What is Newton's First Law known as? The Law of

• Friction

• Inertia

• Mass

• Gravity

An automatic barrier is shown in the given diagram. The barrier arm is balanced by the block of weight W.

Using the data given in the above diagram, what is the weight W of the block.

• 190N

• 1983.33N

• 1983 Kg

• 350 N

A driver foot presses with a steady force of 20 N on a pedal in a car as shown.

What is the Force pulling on the piston?

• 2.5 N

• 10 N

• 100 N

• 160 N

If the maximum moment of force on a door is 10 Nm by an applied force of 2.25N, then the distance of handle from hinge (pivot) is

• 0.225 m.

• 4.444 m.

• 12.250 m.

• 22.500 m.