physics nov/oct 2019

A student measures the dimensions of a cylindrical glass beaker.

For which measurement should she use a micrometer screw gauge?

• A circumference of the beaker

• diameter of the beaker

• height of the beaker

• thickness of the glass wall of the beaker

The graph shows how the speed of a car varies during part of a journey.

What is the acceleration of the car between 6.0 s and 10.0 s?

• 0.50 m / s2

• 0.80 m / s2

• 1.25 m / s2

• 1.50 m / s2

A car travels at an average speed of 60 km / h for 15 minutes.

How far does the car travel in 15 minutes?

• 4.0 km

• 15 km

• 240 km

• 900 km

A box is placed on the ground. An upward force of 15 N is needed to lift the box at constant speed.

Which row correctly describes the box?

• A

• B

• C

• D

The table gives the mass and the volume of three objects P, Q and R.

Which objects can float in a liquid of density 0.85 g / cm3

• P and Q only

• P and R only

• Q and R only

• P, Q and R

A hook is used to lift a metal plate, as shown. An upward force of 100N is needed to lift the metal plate about the pivot, as shown.

What is the weight W of the metal plate?

• 80N

• 100N

• 180N

• 225N

What is the unit of the moment of a force?

• N

• N/ kg

• N/ m

• N m

A ship travels due North through still water at a speed of 20m / s. It enters a channel where there is a current in the water from West to East. The speed of the current is 20 m / s.

Which diagram shows the resultant velocity v of the ship?

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A ball is at rest on the ground. A boy kicks the ball. The boy’s boot is in contact with the ball for 0.040 s. The average force on the ball is 200N. The ball leaves the boy’s boot with a speed of 20 m / s.

Which row gives the impulse of the boot on the ball and the average acceleration of the ball?

• A

• B

• C

• D

An object P of mass 80g collides with another object Q of mass 40 g.

After the collision, P and Q stick together and then travel on together.

Before the collision, P is travelling at a speed of 6.0 m / s and Q is at rest.

What is the speed of P and Q after the collision?

• 2.0 m / s

• 3.0 m / s

• 4.0 m / s

• 6.0 m / s