Question 1

A 10 kg box is pulled across a rough horizontal floor by a rope that makes an angle of $$30^\circ$$ above the horizontal. The tension in the rope is 50 N, and the coefficient of kinetic friction between the box and the floor is 0.3. What is the acceleration of the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.12\ \mathrm{m/s^2$}$$

Question 2

A 5 kg object is dropped from a height of 20 m. Ignoring air resistance, what is the speed of the object just before it hits the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$14.0\ \mathrm{m/s}$$

Question 3

A 2 kg block slides down a frictionless incline from a height of 5 m and then moves across a horizontal surface with a coefficient of kinetic friction $$\mu_k = 0.2. $$How far does the block travel on the horizontal surface before coming to rest? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$25.0\ \mathrm{m}$$

Question 4

A 0.5 kg ball moving at $$8\ \mathrm{m/s}$$ collides elastically with a stationary 0.5 kg ball. What is the velocity of the first ball after the collision?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 5

A 3 kg object is attached to a spring and stretches it by 0.15 m. If a 6 kg object is attached instead, by how much will the spring stretch (assuming Hooke's law applies)?

Accepted Answer

$$0.30\ \mathrm{m}$$

Question 6

A 2 kg object moving at $$10\ \mathrm{m/s}$$ collides inelastically with a 3 kg object at rest. What is the final velocity of the combined mass after the collision?

Accepted Answer

$$4\ \mathrm{m/s}$$

Question 7

A 12 kg object is pulled up a 10 m high hill at constant speed. If the coefficient of kinetic friction is 0.1 and the hill makes a $$30^\circ$$ angle with the horizontal, what is the total work done against friction?

Accepted Answer

$$1018\ \mathrm{J}$$

Question 8

A 0.2 kg ball is thrown vertically upward with a speed of $$15\ \mathrm{m/s}. $$What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$5.7\ \mathrm{m}$$

Question 9

A 1.5 kg object is moving at $$4\ \mathrm{m/s} to $$the right. A constant force acts on it for 3 seconds, changing its velocity to $$10\ \mathrm{m/s} to $$the right. What is the magnitude of the force?

Accepted Answer

$$5\ \mathrm{N}$$

Question 10

A 2 kg object is moving at $$6\ \mathrm{m/s}$$ and collides elastically with a 4 kg object at rest. What is the velocity of the 2 kg object after the collision?

Accepted Answer

$$-2\ \mathrm{m/s}$$

Question 11

A 10 kg crate is pushed across a horizontal floor with a force of 60 N. If the crate moves at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$0.61$$

Question 12

A 0.1 kg ball moving at $$20\ \mathrm{m/s}$$ strikes a wall and rebounds in the opposite direction at $$15\ \mathrm{m/s}. If $$the contact time with the wall is $$0.05\ \mathrm{s}$$, what is the magnitude of the average force exerted by the wall on the ball?

Accepted Answer

$$70\ \mathrm{N}$$

Question 13

A 2 kg object is moving at $$5\ \mathrm{m/s} on a $$frictionless surface. A constant force of $$4\ \mathrm{N}$$ acts in the direction of motion for $$3\ \mathrm{s}. $$What is the final speed of the object?

Accepted Answer

$$11\ \mathrm{m/s}$$

Question 14

A 0.5 kg mass is attached to a spring with a spring constant $$k = 200\ \mathrm{N/m}. $$How much energy is stored in the spring when it is stretched by $$0.1\ \mathrm{m}$$?

Accepted Answer

$$2\ \mathrm{J}$$

Question 15

A 4 kg object is moving at $$10\ \mathrm{m/s}$$ and collides inelastically with a 6 kg object at rest. What is the kinetic energy lost during the collision?

Accepted Answer

$$80\ \mathrm{J}$$

Question 16

A 2 kg object is moving at $$3\ \mathrm{m/s}$$ and is acted upon by a $$6\ \mathrm{N}$$ force in the direction of motion for $$2\ \mathrm{s}. $$What is the change in kinetic energy of the object?

Accepted Answer

$$24\ \mathrm{J}$$

Question 17

A 1 kg object is dropped from a height of 10 m. If it rebounds to a height of 6 m, what is the energy lost during the bounce?

Accepted Answer

$$39.2\ \mathrm{J}$$

Question 18

A 0.2 kg puck slides on a frictionless surface at $$5\ \mathrm{m/s}$$ and collides with a stationary 0.3 kg puck. If after the collision the 0.2 kg puck moves at $$2\ \mathrm{m/s} in $$the same direction, what is the velocity of the 0.3 kg puck after the collision?

Accepted Answer

$$2\ \mathrm{m/s}$$

Question 19

A 5 kg object is moving at $$10\ \mathrm{m/s}$$ and comes to rest due to a constant friction force over a distance of 25 m. What is the magnitude of the friction force?

Accepted Answer

$$20\ \mathrm{N}$$

Physics Practice Test 2 – Step-by-Step Study Guidance

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드