Terminal Velocity in a Uniform Gravitational Field

When a body is falling in a uniform gravitational field and experiencing no air resistance, which force is the only force acting on it?

Normal force

Tension

Friction

Weight (correct)

As a body falls in a uniform gravitational field and accelerates, what effect does air resistance have on the resultant force?

Decreases the resultant force (correct)

Increases the resultant force

Changes the direction of the resultant force

Does not affect the resultant force

Why does the acceleration of a falling body decrease as it moves towards its terminal velocity?

Resultant force increases

Friction decreases

Weight increases

Resultant force decreases (correct)

What happens to the acceleration of a body when it reaches its terminal velocity?

Acceleration becomes zero Signup and view all the answers

Which factor does NOT contribute to an increase in stopping distance when a driver applies brakes?

Reduced reaction time due to caffeine intake Signup and view all the answers

What is the sum of the thinking distance and braking distance known as?

Stopping distance Signup and view all the answers

What does a negative gradient in a distance-time graph signify?

Returning back to the starting point Signup and view all the answers

In a velocity-time graph, what does a horizontal line represent?

Constant speed Signup and view all the answers

What is the unit of force measurement?

Newtons Signup and view all the answers

Which type of force impedes motion between two surfaces?

Friction Signup and view all the answers

What does Newton's first law state about an object's velocity?

Velocity is constant unless acted on by a resultant force Signup and view all the answers

When two forces act along the same line in opposite directions, how should they be handled?

Subtracted Signup and view all the answers

What is the formula for momentum?

p = m × v Signup and view all the answers

How is momentum measured?

Kilogram metres per second (kgm/s) Signup and view all the answers

According to the conservation of momentum principle, what happens to the total momentum in a collision?

Remains the same Signup and view all the answers

How does a seatbelt increase safety in a car crash?

By increasing the time to come to rest Signup and view all the answers

What is the recoil speed of a gun if a 0.01kg bullet is fired at 100m/s from a 10kg stationary gun?

-100 m/s Signup and view all the answers

In a collision, what happens to the total momentum if there are no external forces acting?

Momentum remains constant Signup and view all the answers