Podcast
Questions and Answers
When a body is falling in a uniform gravitational field and experiencing no air resistance, which force is the only force acting on it?
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?
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?
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?
What happens to the acceleration of a body when it reaches its terminal velocity?
Which factor does NOT contribute to an increase in stopping distance when a driver applies brakes?
Which factor does NOT contribute to an increase in stopping distance when a driver applies brakes?
What is the sum of the thinking distance and braking distance known as?
What is the sum of the thinking distance and braking distance known as?
What does a negative gradient in a distance-time graph signify?
What does a negative gradient in a distance-time graph signify?
In a velocity-time graph, what does a horizontal line represent?
In a velocity-time graph, what does a horizontal line represent?
What is the unit of force measurement?
What is the unit of force measurement?
Which type of force impedes motion between two surfaces?
Which type of force impedes motion between two surfaces?
What does Newton's first law state about an object's velocity?
What does Newton's first law state about an object's velocity?
When two forces act along the same line in opposite directions, how should they be handled?
When two forces act along the same line in opposite directions, how should they be handled?
What is the formula for momentum?
What is the formula for momentum?
How is momentum measured?
How is momentum measured?
According to the conservation of momentum principle, what happens to the total momentum in a collision?
According to the conservation of momentum principle, what happens to the total momentum in a collision?
How does a seatbelt increase safety in a car crash?
How does a seatbelt increase safety in a car crash?
What is the recoil speed of a gun if a 0.01kg bullet is fired at 100m/s from a 10kg stationary gun?
What is the recoil speed of a gun if a 0.01kg bullet is fired at 100m/s from a 10kg stationary gun?
In a collision, what happens to the total momentum if there are no external forces acting?
In a collision, what happens to the total momentum if there are no external forces acting?
