NSC Physical Sciences Work, Energy, and Power: A constant net force is applied

Question

A constant net force is applied to a block. Which ONE of the following statements is CORRECT?

The block will move with a …

A constant velocity.
B constant acceleration.
C constantly increasing acceleration.
D constantly decreasing acceleration.

A crate of mass m is stationary on a plane inclined at an angle θ with the horizontal.

Which ONE of the following statements regarding the magnitude of the frictional force acting on the crate is CORRECT?

a) equal to the component of the weight of the crate which is parallel to the plane.

b) equal to the component of the weight of the crate which is perpendicular to the plane.

c) equal to large component of the weight of the crate which is perpendicular to the plane.

d) larger than the component of the weight of the crate which is parallel to the plane.

A ball is projected vertically upwards from the top edge of a building. Points P, Q, R and S represent different positions during the motion of the ball, as shown in the diagram below.

Ignore the effects of air friction.

Between which two points will the ball undergo the greatest change in kinetic energy?

A P and S
B P and R
C R and S
D Q and S

A ball is dropped from height h and strikes the floor with momentum p. The ball is then dropped from height ½h.

Ignore the effects of air friction.

Which ONE of the following represents the momentum of the ball when it strikes the floor after being dropped from height ½h?

A p
B $\frac{1}{\sqrt{2}}p$
C $\frac{1}{2}p$
D 2p

A box moves on a horizontal surface. The diagram below shows all the forces acting on the box.

Which ONE of the following combinations of forces do work on the box?

A P and R only
B Q and S only
C Q, R and S only
D P, Q, R and S

Refer to the diagram below.

Q and R are small spheres suspended by light insulated strings.

When a negatively charged rod is brought close to sphere Q, sphere Q is repelled. When the negatively charged rod is brought close to sphere R, sphere R is attracted.

Which ONE of the combinations below explains the nature of the charges on spheres Q and R?

NATURE OF CHARGE ON SPHERE Q
NATURE OF CHARGE ON SPHERE R
A Negative
Negative
B Positive
Negative
C Neutral
Positive
D Negative
Neutral

Four voltmeters, V1, V2, V3 and V4, are connected in a circuit, as shown in the diagram below.

Which ONE of the combinations below is CORRECT for the magnitude and direction of the induced current in the external circuit?

MAGNITUDE OF INDUCED CURRENT
DIRECTION OF INDUCED CURRENT
A Constant
Constant
B Changes
Constant
C Constant
Changes
D Changes
Changes

Light of a suitable frequency is shone on the surface of a metal and electrons are ejected from the metal.

Which ONE of the following is equal to the ratio of the work function to the threshold frequency of the metal?

A Planck's constant
B The inverse of Planck's constant
C The maximum kinetic energy of the ejected electrons
D The energy of the incident photons

A constant net force is applied to a block - NSC Physical Sciences - Question 1 - 2023 - Paper 1

Worked Solution & Example Answer:A constant net force is applied to a block - NSC Physical Sciences - Question 1 - 2023 - Paper 1

Which ONE of the following statements is CORRECT?