Force and Motion

Force and Motion

Multiple Choice

Area under velocity - time graph represents

• distance

• speed

• acceleration

• velocity

Multiple Choice

A particle is moving in a circular path of radius r. The distance after half a circle would be

• 2r

• 0

• $\pi r$
  

• $2\pi r$

Multiple Choice

A car accelerates uniformly from from 5m/s to 10 m/s in 5s. Calculate the distance covered by the car in that time.

• 32 m

• 25 m

• 37.5 m

• 40 m

Multiple Choice

The brakes applied to a running train produce an acceleration of 0.6 m/s² in a direction opposite that of motion. If train takes 60s to stop after application of brakes, calculate distance travelled before coming to rest.

• 1080 m

• 1200 m

• 1500m

• 2156 m

Multiple Choice

A racing car at rest accelerates uniformly to a velocity of 144 km/hr in 20 s. Find value of acceleration of the car.

• 5 m/s²

• 2 m/s²

• 0.2 m/s²

• 0.5 m/s²

Multiple Select

Why do athletes put some sand or cushion on the ground while jumping?

• To reduce the momentum of athlete

• To reduce the gravitational pull on athlete

• This will increase the time period which reduces the impact of force.

• Above all

Multiple Choice

Two objects, each of mass 1 kg are moving in the same straight line but in opposite directions. The velocity of each object is 3 m/s before the collision during which they stick together. What will be the velocity of combined object after collision?

• 3m/s

• 6 m/s

• 0

• 2 m/s

Multiple Choice

The momentum of an object depends on what two things.

• gravity and friction

• friction and inertia

• mass and velocity

• force and energy

Multiple Choice

A body of mass 1 kg is kept at rest. A force of 6N acts on it, Find the time taken by body to move through a distance of 12 m.

• 6 sec

• 8 sec

• 4 sec

• 2 sec

Multiple Choice

Momentum means .....

• the measurement of how easy or difficult it is to stop a moving object

• when two objects rub against each other

• a force where objects are pulled towards the center of the earth

• the tendency of a moving object to keep moving in a straight line

Multiple Choice

An object's inertia depends on the _______________of the object.

• gravity

• friction

• mass

• inertia

Multiple Choice

A bullet of mass 20 g is horizontally fired with a velocity 150 m/s from a pistol of mass 2 kg. What is the recoil velocity of the pistol?

• -1.5 m/s²

• 0.5 m/s²

• 1.5 m/s²

• -2.5 m/s²

Multiple Choice

Starting from a stationary position, Satvik attain a velocity of 20 m/s in 4 s, while competing for a race. Calculate his acceleration during the period. Assume the acceleration to be unifrom.

• 2 m/s²

• 3 m/s²

• 8 m/s²

• 5 m/s²

Multiple Choice

Which law explains how rockets are launched into space?

• First Law of Motion

• Second Law of Motion

• Third Law of Motion

• None of the Above

Multiple Choice

A soccer ball accelerates more than a bowling ball when thrown with the same force. What law is this an example of?

• First Law of Motion

• Second Law of Motion

• Third Law of Motion

Multiple Choice

Pushing a child on a swing is easier than pushing an adult on the same swing. What law is this an example of?

• First Law of Motion

• Second Law of Motion

• Third Law of Motion

Multiple Choice

A person's body is thrown outward as a car rounds a curve on a highway. What law is this an example of?

• First Law of Motion

• Second Law of Motion

• Third Law of Motion

Multiple Choice

If the gymnast decreases the force they exerts on the trampoline, what will the reaction be?

• The gymnast will be pushed back by the trampoline with more force and go higher into the air

• The gymnast will be pushed back by the trampoline with less force and not go as high into the air

• No change will happen to the gymnast

Multiple Choice

A racing car has an uniform acceleration of 4 m/s^2. What distance will it travel in 10s before coming to rest.

• 110 m

• 200m

• 120 m

• 220m

Multiple Choice

If you apply MORE force to the ground what happens to the ground pushing on you?

• The force remains the same

• The force increases

• The force decreases

Multiple Choice

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow
• the arrow's push against the bowstring
• the grip of the archer's hand on the bow

Multiple Choice

A spring balance has 5 marks between 10g to 20g.What is it's least count and range?

• 1 g

• 2g

• 3g

• 4g

Open Ended

State Newtons Second Law of Motion. Give one example

Multiple Choice

A car driver driving at a speed of 90km/hr applies brakes and brings car to rest in 20s. The acceleration of car is

• 1 m/s²

• -1.5 m/s²

• -1.25 m/s²

• 2.5 m/s²

Multiple Choice

If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?  (F=ma)

• The one with a mass of .78 kg will have the greatest acceleration.
• The one with a mass of .52 kg will have the greatest acceleration.
• They will both accelerate at the same rate.

Multiple Choice

Which force is shown in the picture? (look at he brakes being used on the roller blades)

• push

• pull

• gravity

• friction

Open Ended

State Newtons First Law of Motion.

Open Ended

State the Law of conservation of momentum.