Newton's Laws of Motion Practice Questions

State the size of the resultant force acting on the hanging basket.

Resultant force = .................... N

State the size and the direction of the force that the chain exerts on the hanging basket.

Complete the sentence.

Newton's First Law states that the velocity of an object will only change if .................... .

State Newton's Third Law.

State the size and the direction of the force that the water exerts on the swimmer.

The two forces in part (b) are equal in size and opposite in direction. Explain why they do not cancel each other out.

Write down the equation that links acceleration ($a$), mass ($m$) and resultant force ($F$).

The go-kart accelerates at $4.0\ \text{m/s}^2$.

Calculate the resultant force on the go-kart and driver.

Resultant force = .................... N

A heavier driver gets into the same go-kart, so that the total mass is doubled.

The resultant force stays the same.

State what happens to the acceleration of the go-kart.

State the total resistive force acting on the lorry.

Resistive force = .................... N

Explain, using Newton's First Law, why the lorry travels at a steady speed.

The driver increases the driving force to 6000 N. The resistive force does not change immediately.

Calculate the new resultant force on the lorry and describe the effect on the motion of the lorry.

State the independent variable in this investigation and give one variable that must be controlled.

The student used two light gates connected to a data logger instead of a stopwatch.

Explain why this improves the investigation.

Use Table 1 to show that the acceleration of the trolley is inversely proportional to its mass.

Define inertial mass.

A resultant force of 96 N acts on a loaded sack trolley. The sack trolley accelerates at $1.5\ \text{m/s}^2$.

Calculate the inertial mass of the loaded sack trolley.

Inertial mass = .................... kg

A passenger is standing on a bus that is moving forwards. The bus slows down and the passenger lurches forwards.

Explain, in terms of inertia, why the passenger lurches forwards.

Explain why the athlete must keep pulling on the wire, even though the speed of the ball is constant.

The athlete releases the wire.

Describe the horizontal motion of the ball immediately after it is released. Assume that air resistance is negligible.

Use Newton's First Law in your answer.

Calculate the acceleration of the car.

Acceleration = .................... m/s²

The mass of the car and its passengers is about 1400 kg.

Estimate the resultant force on the car during this acceleration.

Resultant force = .................... N

Explain why the driving force produced by the engine must be greater than your answer to part (b).

Which statement about forces X and Y is correct?

Tick ($\checkmark$) one box.

• They are equal in size because the resultant force on the crate is zero.
• They are equal in size because they are a Newton's Third Law pair.
• X is larger than Y because the crate does not sink into the floor.

Explain why X and Y are not a Newton's Third Law pair of forces.

State the size and direction of the force that the crate exerts on the floor.

Describe the relationship shown by the graph for pulling forces greater than 0.10 N.

Suggest why the trolley did not accelerate until the pulling force was greater than 0.10 N.

Describe what the student should have done to the apparatus to compensate for friction.

Use the graph to calculate the mass of the trolley.

Mass = .................... kg

Calculate the resultant force acting on the ferry.

Use the equation:

$v^2 - u^2 = 2\,a\,s$

Resultant force = .................... N

The thrust produced by the ferry's engines during this time was $3.2 \times 10^5\ \text{N}$.

Calculate the total resistive force acting on the ferry.

Resistive force = .................... N

Calculate the weight of the lift and the people inside it.

Weight = .................... N

The lift accelerates upwards at $1.2\ \text{m/s}^2$.

Calculate the tension force in the cable.

Tension = .................... N

State the size and direction of the force that the lift exerts on the cable while it is accelerating upwards.